JP6041733B2 - Evaluation method of hydrogen storage alloy powder - Google Patents
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- 239000000843 powder Substances 0.000 title claims description 153
- 239000000956 alloy Substances 0.000 title claims description 139
- 229910045601 alloy Inorganic materials 0.000 title claims description 139
- 238000003860 storage Methods 0.000 title claims description 94
- 239000001257 hydrogen Substances 0.000 title claims description 84
- 229910052739 hydrogen Inorganic materials 0.000 title claims description 84
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims description 81
- 238000011156 evaluation Methods 0.000 title claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000006228 supernatant Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 26
- 239000003513 alkali Substances 0.000 claims description 21
- 239000011248 coating agent Substances 0.000 claims description 15
- 238000000576 coating method Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 13
- 229910052987 metal hydride Inorganic materials 0.000 claims description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 11
- 239000000853 adhesive Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000004898 kneading Methods 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 5
- -1 nickel metal hydride Chemical class 0.000 claims description 4
- 239000002003 electrode paste Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 62
- 239000002244 precipitate Substances 0.000 description 31
- 238000004519 manufacturing process Methods 0.000 description 23
- 238000002360 preparation method Methods 0.000 description 16
- 230000018044 dehydration Effects 0.000 description 15
- 238000006297 dehydration reaction Methods 0.000 description 15
- 239000007788 liquid Substances 0.000 description 14
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 238000005406 washing Methods 0.000 description 7
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000000654 additive Substances 0.000 description 6
- 239000007773 negative electrode material Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 3
- 239000008151 electrolyte solution Substances 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 150000002431 hydrogen Chemical class 0.000 description 3
- 238000002203 pretreatment Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000012854 evaluation process Methods 0.000 description 2
- 230000001747 exhibiting effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229910001122 Mischmetal Inorganic materials 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Battery Electrode And Active Subsutance (AREA)
Description
本発明は、ニッケル水素蓄電池に用いる水素吸蔵合金粉末の評価方法に関する。 The present invention relates to a valuation method of the hydrogen storage alloy powder used in the nickel-hydrogen storage battery.
近年、ハイブリッド自動車、電気自動車などの車両や、ノート型パソコン、ビデオカムコーダなどのポータブル電子機器の駆動用電源に、充放電可能なニッケル水素蓄電池（以下、単に電池ともいう）が利用されている。
このような電池に関して、例えば、特許文献１には、水素吸蔵合金粉末を有する負極合剤ペーストの製造方法が開示されている。
In recent years, nickel-metal hydride storage batteries (hereinafter also simply referred to as “batteries”) that can be charged and discharged have been used as driving power sources for vehicles such as hybrid vehicles and electric vehicles, and portable electronic devices such as notebook computers and video camcorders.
Regarding such a battery, for example,
ところで、負極板（あるいは電池）の製造時、上述の特許文献１に記載の製法で作製した負極合剤ペーストをはじめ、一般に負極合剤ペーストには良好な塗着性が要求される。塗着性が低い負極合剤ペーストを用いた場合には、基材上に負極合剤ペーストが一様に塗着されずに、負極板の生産効率が低くなってしまうことがある。
負極合剤ペーストの塗着性の評価及び負極合剤ペーストに用いる水素吸蔵合金粉末の塗着性に関する良否の評価については、負極合剤ペーストを実際に基材に塗着して評価するか、あるいは、作製した負極合剤ペースト自身のチキソトロピー性を評価することで行ってきた。なお、チキソトロピー性が高い負極合剤ペーストの塗着性は良好であり、逆に、チキソトロピー性が低い負極合剤ペーストの塗着性は悪いことが分かっている。
但し、上述のいずれの場合でも、実際に作製した負極合剤ペーストを用いて評価する必要があるため、塗着性が良くない場合には、合金粉末と共に結着剤等の添加物を水と混練して負極合剤ペーストを作製する段階、あるいは、この負極合剤ペーストを作製する前工程の段階において負極合剤ペーストの塗着性が低下したのか、特定が困難であった。
By the way, at the time of manufacture of a negative electrode plate (or battery), generally good coating properties are required for the negative electrode mixture paste including the negative electrode mixture paste produced by the manufacturing method described in
For the evaluation of the applicability of the negative electrode mixture paste and the quality of the hydrogen storage alloy powder used for the negative electrode mixture paste, the negative electrode mixture paste is actually applied to the substrate for evaluation. Alternatively, it has been carried out by evaluating the thixotropy of the prepared negative electrode mixture paste itself. It has been found that the coating property of the negative electrode mixture paste having high thixotropy is good, and conversely, the coating property of the negative electrode mixture paste having low thixotropy is poor.
However, in any of the above cases, since it is necessary to evaluate using the actually prepared negative electrode mixture paste, if the coatability is not good, additives such as a binder together with the alloy powder and water It was difficult to specify whether the coating property of the negative electrode mixture paste had deteriorated at the stage of kneading to produce the negative electrode mixture paste, or at the stage of the previous step of producing this negative electrode mixture paste.
本発明は、かかる問題点に鑑みてなされたものであって、負極合剤ペーストの作製に用いる水素吸蔵合金粉末の評価方法を提供することを目的とする。 The present invention was made in view of the above problems, an object of the Turkey to provide a method of evaluating the hydrogen-absorbing alloy powders for use in the production of the negative electrode material mixture paste.
本発明の一態様は、ニッケル水素蓄電池の負極板に塗着する水素吸蔵合金粉末の塗着性を評価する水素吸蔵合金粉末の評価方法であって、 上記水素吸蔵合金粉末は、その表面にアルカリ処理により析出した上記水素吸蔵合金粉末をなす金属元素の水酸化物からなる析出物が付着してなる表面付着合金粉末であり、上記表面付着合金粉末を、少なくとも上記表面付着合金粉末の量、純水の量、攪拌条件、及び放置時間について予め定めた条件下で上記純水に投入し撹拌し、上澄み液を得る上澄み液取得工程と、上記上澄み液の濁度を測定する濁度測定工程と、上記上澄み液の濁度と上記表面付着合金粉末を水と混練してできた負極ペーストの塗着性との相関関係を利用して、測定した上記濁度から、上記表面付着合金粉末の良否を評価する評価工程と、を備える水素吸蔵合金粉末の評価方法である。 One aspect of the present invention is a method for evaluating a hydrogen storage alloy powder for evaluating the applicability of a hydrogen storage alloy powder applied to a negative electrode plate of a nickel metal hydride storage battery, wherein the hydrogen storage alloy powder has an alkali on its surface. It is a surface-attached alloy powder to which deposits made of metal element hydroxide forming the hydrogen-absorbing alloy powder deposited by the treatment are adhered, and the surface-attached alloy powder is at least in an amount of the surface-attached alloy powder. A step of obtaining a supernatant to obtain a supernatant by stirring into the pure water under predetermined conditions for the amount of water, stirring conditions, and standing time, and a turbidity measuring step for measuring the turbidity of the supernatant. From the turbidity measured using the correlation between the turbidity of the supernatant and the applicability of the negative electrode paste formed by kneading the surface-adhesive alloy powder with water, the quality of the surface-adhesive alloy powder is determined. Evaluate the rating A hydrogen storage alloy powder evaluation method comprising: a step.
本発明者らの研究により、水素吸蔵合金粉末を所定の条件下で水に投入し撹拌した上澄み液の濁度が、この水素吸蔵合金粉末を水と混練して作製した負極合剤ペーストの塗着性と相関関係を有することが分かってきた。具体的には、濁度が低い水素吸蔵合金粉末を用いた負極合剤ペーストは塗着性が良好となる。逆に、濁度が高い粉末を用いると塗着性が低いペーストになる。
また、水素吸蔵合金粉末のうち、その表面にアルカリ処理により析出した析出物が付着してなる表面付着合金粉末は、水中に分散させた場合の、水素吸蔵合金粉末本体からの析出物の分離のしやすさ（粉末本体と析出物との接合の強さ）が粉末によって異なることも分かってきた。析出物が分離しやすいと、負極合剤ペースト中に微細な析出物粒子が多量に存在することとなる。すると、分離した析出物粒子が結着剤などペースト中の添加物と反応してこの添加物の機能が低下して、水素吸蔵合金粉末同士の間に介在できなくなるため、水素吸蔵合金粉末同士が凝集して沈降しやすいペーストとなる。さらに、水素吸蔵合金粉末の表面に、析出物が付着していないこと自体も、水素吸蔵合金粉末同士が凝集しやすい要因となる。
一方、このように析出物が分離しやすい表面付着合金粉末を、所定の条件下で水に投入し撹拌した上澄み液では、多量の析出物粒子によって濁度が高くなる。
上述の水素吸蔵合金粉末の評価方法によれば、濁度と負極合剤ペーストの塗着性との間の相関関係を利用し、負極合剤ペーストを実際に作製する前に、負極合剤ペーストの塗着性及び水素吸蔵合金粉末（表面付着合金粉末）の良否を評価することができる。
According to the research by the present inventors, the turbidity of the supernatant liquid obtained by adding hydrogen-absorbing alloy powder to water under predetermined conditions and stirring is determined by applying a negative electrode mixture paste prepared by kneading this hydrogen-absorbing alloy powder with water. It has been found that there is a correlation with wearability. Specifically, the negative electrode mixture paste using the hydrogen storage alloy powder having low turbidity has good coatability. On the contrary, when a powder with high turbidity is used, it becomes a paste with low applicability.
In addition, among the hydrogen storage alloy powders, the surface-attached alloy powder formed by adhering precipitates deposited by alkali treatment on the surface is the separation of the precipitates from the hydrogen storage alloy powder body when dispersed in water. It has also been found that the ease (the strength of bonding between the powder body and the precipitate) varies depending on the powder. If the precipitate is easily separated, a large amount of fine precipitate particles are present in the negative electrode mixture paste. Then, the separated precipitate particles react with the additive in the paste such as a binder, and the function of this additive is reduced, and the hydrogen storage alloy powder cannot be interposed between the hydrogen storage alloy powders. It becomes a paste that easily aggregates and settles. Furthermore, the fact that no deposits adhere to the surface of the hydrogen storage alloy powder itself also causes the hydrogen storage alloy powder to easily aggregate.
On the other hand, in the supernatant liquid in which the surface-attached alloy powder in which precipitates are easily separated is poured into water under a predetermined condition and stirred, the turbidity is increased by a large amount of precipitate particles.
According to the above-described method for evaluating the hydrogen storage alloy powder, the negative electrode mixture paste is used before actually preparing the negative electrode mixture paste by utilizing the correlation between the turbidity and the coating property of the negative electrode mixture paste. It is possible to evaluate the applicability and the quality of the hydrogen storage alloy powder (surface-attached alloy powder).
なお、「少なくとも上記表面付着合金粉末の量、純水の量、攪拌条件、及び放置時間について予め定めた条件下で水に投入し撹拌し、上澄み液を得る」手法としては、例えば、１００ｍＬ用のビーカに、水素吸蔵合金粉末を３０ｇ、及び、純水を１００ｇそれぞれ投入し、スパチュラで１００回撹拌した後、１０分間放置した後の上澄み液を取採する手法が挙げられる。なお、撹拌後、水素吸蔵合金粉末をより確実に沈殿させるため、撹拌後のビーカを、例えば３０００−４０００ガウス程度の磁石上に載置しても良い。
また、アルカリ処理とは、所定量の水素吸蔵合金粉末を、所定量の水酸化カリウム水溶液等のアルカリ水溶液中に投入して、所定温度に保ちながら所定時間撹拌する処理をいう。なお、このアルカリ処理による析出物としては、水素吸蔵合金粉末をなす金属元素の水酸化物が挙げられる。
In addition, as a method of “adding and stirring to water under a predetermined condition with respect to at least the amount of the surface-attached alloy powder, the amount of pure water, the stirring condition, and the standing time to obtain a supernatant”, for example, for 100 mL In this beaker, 30 g of hydrogen storage alloy powder and 100 g of pure water are respectively added, stirred 100 times with a spatula, and allowed to stand for 10 minutes, and then the supernatant is collected. In addition, in order to precipitate hydrogen storage alloy powder more reliably after stirring, you may place the beaker after stirring on a magnet of about 3000-4000 Gauss, for example.
The alkali treatment refers to a treatment in which a predetermined amount of hydrogen storage alloy powder is put into an aqueous alkali solution such as an aqueous potassium hydroxide solution and stirred for a predetermined time while maintaining a predetermined temperature. As the deposit by the alkali treatment, and hydroxide of a metal element which forms a hydrogen-absorbing alloy powder.
また、水素吸蔵合金粉末を含む負極合剤ペーストを塗着した負極板を備えるニッケル水素蓄電池の製造方法であって、上記水素吸蔵合金粉末は、その表面にアルカリ処理により析出した析出物が付着してなる表面付着合金粉末であり、上記表面付着合金粉末を所定条件下で水に投入し撹拌して得た上澄み液の濁度が所定値以下の上記表面付着合金粉末を、水と混練して負極合剤ペーストを作製するペースト作製工程と、上記負極合剤ペーストを基材に塗着して上記負極板を作製する負極板作製工程と、を備えるニッケル水素蓄電池の製造方法とするのが好ましい。 Also, a manufacturing method of a nickel-metal hydride storage battery comprising a negative electrode plate having Nurigi a negative electrode mixture paste comprising a hydrogen storage alloy powder, said hydrogen-absorbing alloy powder, precipitates precipitated by alkali treatment adheres to the surface The surface-attached alloy powder is obtained by mixing the above-mentioned surface-attached alloy powder having a turbidity of a supernatant not higher than a predetermined value with water. Te and paste preparation step of preparing a negative electrode mixture paste, that a negative electrode plate manufacturing process and method for producing a nickel-metal hydride storage battery comprising of making the negative electrode plate by Nurigi the mixture paste to a substrate Is preferred .
前述したように、上澄み液の濁度と、この水素吸蔵合金粉末を水と混練してできた負極合剤ペーストの塗着性との間に相関関係がある。そこで、この相関関係を利用して、負極合剤ペーストが良好な塗着性を有するように、濁度に許容できる範囲を設けることができる。
これに基づいて、上述の電池の製造方法は、上述したペースト作製工程と負極板作製工程とを備えるため、ペースト作製工程では、所望の範囲の塗着性を有する負極合剤ペーストを作製することができる。
しかも、水素吸蔵合金粉末が表面付着合金粉末であるため、ペースト作製工程で、表面付着合金粉末のうち、濁度が所定値以下の、従って析出物が分離しがたい粉末を用いて負極合剤ペーストを作製できる。かくして、塗着性の良好な負極合剤ペーストを用いてできた負極板を備える電池を製造できる。
As described above, there is a correlation between the turbidity of the supernatant and the applicability of the negative electrode mixture paste made by kneading this hydrogen storage alloy powder with water. Therefore, by utilizing this correlation, a range in which the turbidity can be allowed can be provided so that the negative electrode mixture paste has good coating properties.
Based on this, since the above-described battery manufacturing method includes the paste preparation step and the negative electrode plate preparation step described above, in the paste preparation step, a negative electrode mixture paste having a desired range of coating properties is prepared. Can do.
In addition, since the hydrogen storage alloy powder is a surface-attached alloy powder, the negative electrode mixture is prepared by using a powder having a turbidity of a predetermined value or less, and thus the precipitate is difficult to separate in the surface-preparing alloy powder. A paste can be produced. Thus, a battery including a negative electrode plate made using a negative electrode mixture paste having good coatability can be produced.
また、水素吸蔵合金粉末を含む負極合剤ペーストを塗着した負極板を備えるニッケル水素蓄電池の製造方法であって、上記水素吸蔵合金粉末は、その表面にアルカリ処理により析出した析出物が付着してなる表面付着合金粉末であり、上記アルカリ処理を行い上記表面付着合金粉末を作製するアルカリ処理工程と、上記アルカリ処理の後、上記表面付着合金粉末を水洗する水洗工程と、上記水洗工程の後、上記表面付着合金粉末を酸素にさらしつつ脱水する脱水工程と、上記脱水工程の後、上記表面付着合金粉末を、所定の条件下で水に投入し撹拌し、上澄み液を得る上澄み液取得工程と、上記上澄み液の濁度を測定する濁度測定工程と、脱水した上記表面付着合金粉末を水と混練して負極合剤ペーストを作製するペースト作製工程と、を備え、上記上澄み液の濁度が所定値よりも大きい場合には、上記脱水工程において上記表面付着合金粉末をさらす上記酸素の暴露量を増大させる上記ニッケル水素蓄電池の製造方法とするのが好ましい。 Also, a manufacturing method of a nickel-metal hydride storage battery comprising a negative electrode plate having Nurigi a negative electrode mixture paste comprising a hydrogen storage alloy powder, said hydrogen-absorbing alloy powder, precipitates precipitated by alkali treatment adheres to the surface A surface-adhesive alloy powder obtained by performing the alkali treatment to produce the surface-adhesive alloy powder, a water-washing step of washing the surface-adhesive alloy powder after the alkali treatment, and the water-washing step. Thereafter, a dehydration step of dehydrating the surface-attached alloy powder while exposing it to oxygen, and after the dehydration step, the surface-attached alloy powder is poured into water under predetermined conditions and stirred to obtain a supernatant liquid. A turbidity measuring step for measuring the turbidity of the supernatant, and a paste preparation step for preparing a negative electrode mixture paste by kneading the dehydrated surface-adhered alloy powder with water. , When the turbidity of the supernatant liquid is larger than a predetermined value, to a method for manufacturing the nickel-metal hydride storage battery to increase the exposure of the oxygen exposure of the surface adhesion alloy powder in the dewatering process is preferred.
本発明者らによれば、表面付着合金粉末を水中に分散させた場合における、粉末本体からの析出物の分離のしやすさ（粉末本体と析出物との接合の強さ）は、アルカリ処理を行ってできた表面付着合金粉末を水洗し脱水するときに、この表面付着合金粉末をさらす酸素の量（暴露量）によることが判ってきた。具体的には、脱水時に酸素の暴露量を多くした表面付着合金粉末ほど、水中に分散させた場合に本体から析出物が分離し難いことが分かってきた。このため、脱水時における酸素の暴露量が少なく、粉末本体から析出物が分離しやすい表面付着合金粉末の上澄み液は、大きな濁度となりやすい。 According to the present inventors, when the surface-adhesive alloy powder is dispersed in water, the ease of separation of the precipitate from the powder body (the strength of bonding between the powder body and the precipitate) is determined by alkali treatment. It has been found that the amount of oxygen (exposure amount) to which the surface-attached alloy powder is exposed when the surface-attached alloy powder is washed and dehydrated is determined. Specifically, it has been found that a surface-attached alloy powder with an increased exposure amount of oxygen during dehydration is less likely to separate precipitates from the main body when dispersed in water. For this reason, the supernatant liquid of the surface-attached alloy powder that has a small amount of oxygen exposure during dehydration and from which precipitates are easily separated from the powder body tends to have a large turbidity.
これに基づいて、上述の電池の製造方法では、上述のアルカリ処理工程、水洗工程、脱水工程、上澄み液取得工程、濁度測定工程及びペースト作製工程を備え、濁度測定工程で測定した濁度が所定値よりも大きい場合には、脱水工程において表面付着合金粉末をさらす酸素の暴露量を増大させる。これにより、脱水工程では、暴露量の増大前よりも、粉末本体から析出物が分離し難い表面付着合金粉末とすることができる。従って、負極合剤ペーストを作製するよりも前の段階にペーストの塗着性の低下するのを特定できると共に、濁度を確実に小さくすることができ、負極合剤ペーストとした場合に良好な塗着性を示す表面付着合金粉末を用いて電池を製造できる。 Based on this, in the battery manufacturing method described above, the turbidity measured in the turbidity measurement step is provided with the alkali treatment step, the water washing step, the dehydration step, the supernatant liquid acquisition step, the turbidity measurement step, and the paste preparation step. Is larger than a predetermined value, the exposure amount of oxygen to which the surface-attached alloy powder is exposed in the dehydration process is increased. Thereby, in a dehydration process, it can be set as the surface adhesion alloy powder from which a precipitate is hard to isolate | separate from a powder main body rather than before the exposure amount increases. Therefore, it is possible to specify that the paste coatability is lowered before the preparation of the negative electrode mixture paste, and it is possible to reliably reduce the turbidity. A battery can be manufactured using the surface-adhesive alloy powder exhibiting coatability.
また、水素吸蔵合金粉末を含む負極活物質層を有する負極板を備えるニッケル水素蓄電池であって、上記水素吸蔵合金粉末は、その表面にアルカリ処理により析出した析出物が付着してなる表面付着合金粉末であり、所定条件下で水に投入し撹拌して得た上澄み液の濁度が所定値以下の上記表面付着合金粉末を、水と混練した負極合剤ペーストを基材に塗着して、上記負極活物質層を形成してなるニッケル水素蓄電池とするのも好ましい。 Also, a nickel-metal hydride storage battery comprising a negative electrode plate having a negative electrode active material layer containing a hydrogen-absorbing alloy powder, said hydrogen-absorbing alloy powder, the surface adhesion precipitates precipitated by alkali treatment on the surface thereof is adhered The above-mentioned surface-adhered alloy powder having a turbidity of a supernatant obtained by adding and stirring into water under predetermined conditions is applied to a substrate with a negative electrode mixture paste kneaded with water. Thus, it is also preferable to form a nickel-metal hydride storage battery in which the negative electrode active material layer is formed.
上述の電池では、所定条件下で水に投入し撹拌して得た上澄み液の濁度が所定値以下の表面付着合金粉末を、水と混練した負極合剤ペーストを基材に塗着して、負極活物質層を形成してなる。このため、良好な塗着性を有する負極合剤ペーストを用いて、良好に塗着された負極板を有する電池とすることができる。 In the battery described above, a surface adhering alloy powder having a turbidity of a supernatant obtained by stirring in water under predetermined conditions is applied to a substrate with a negative electrode mixture paste kneaded with water. A negative electrode active material layer is formed. For this reason, it can be set as the battery which has the negative electrode plate apply | coated favorably using the negative mix paste which has favorable applicability | paintability.
（実施形態）
次に、本発明の実施形態について、図面を参照しつつ説明する。
本実施形態にかかる電池１は、図１に示すように、矩形箱型の電池ケース７０と、この電池ケース７０内に収容する、水素吸蔵合金粉末２２を含む負極板２０を有する電極体１０、及び、電解液（図示しない）とを備えるニッケル水素蓄電池である。このうち電解液は、水酸化カリウム（ＫＯＨ）を主成分とする比重が１．２のアルカリ性水溶液である。
また、電池ケース７０は、有底矩形箱形の電槽７１と矩形板状の封口板７２とを有する。この電池ケース７０では、封口板７２が電槽７１の開口全体を閉塞している。
また、この電池ケース７０は、封口板７２上に、自己復帰型（即ち、ガスの発生により電池ケース７０の内圧が上昇したらガス排出孔（図示しない）を開放してガスを外部に排出する一方、ガスを排出した後、ガス排出孔を再び閉塞する形態）の安全弁機構ＳＶを配置している。
(Embodiment)
Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the
The
In addition, the
また、電極体１０は、いずれも矩形板状の正極板３０及び負極板２０と矩形シート状のセパレータ４０とからなる。この電極体１０は、セパレータ４０を介して、複数の正極板３０と複数の負極板２０とを交互に積層した積層型の電極群である。
このうち負極板２０は、導電性を有するニッケルメッキ鋼板２８と、このニッケルメッキ鋼板２８に担持された水素吸蔵合金粉末２２とを有している。ニッケルメッキ鋼板２８は、表面をニッケルめっきした金属多孔板（パンチングメタル）からなる。
また、水素吸蔵合金粉末２２は、組成がＭｍＡｌ0.42Ｍｎ0.45Ｃｏ0.20Ｎｉ4.18（Ｍｍ：ミッシュメタル）の合金からなる。なお、この水素吸蔵合金粉末２２は、表面に粒子状の析出物Ｆが多数付着している水素吸蔵合金粉末である。付着物Ｆは、水素吸蔵合金粉末２２をなす金属元素の水酸化物（Ｌａ（ＯＨ）3やＭｎ（ＯＨ）2など）である。
The electrode body 10 includes a rectangular plate-like positive electrode plate 30 and a negative electrode plate 20 and a rectangular sheet-like separator 40. The electrode body 10 is a stacked electrode group in which a plurality of positive plates 30 and a plurality of negative plates 20 are alternately stacked with separators 40 interposed therebetween.
Among these, the negative electrode plate 20 includes a nickel-plated steel plate 28 having conductivity and a hydrogen storage alloy powder 22 supported on the nickel-plated steel plate 28. The nickel-plated steel plate 28 is made of a metal porous plate (punching metal) whose surface is nickel-plated.
The hydrogen storage alloy powder 22 is made of an alloy having a composition of MmAl 0.42 Mn 0.45 Co 0.20 Ni 4.18 (Mm: Misch metal). The hydrogen storage alloy powder 22 is a hydrogen storage alloy powder having a large number of particulate precipitates F attached to the surface. The deposit F is a metal element hydroxide (La (OH) 3 , Mn (OH) 2, etc.) forming the hydrogen storage alloy powder 22.
次いで、本実施形態にかかる電池１の製造方法について、図面を参照しつつ説明する。図２は、本実施形態の電池１の製造方法の流れを示すフローチャートである。
まず、ステップＳ１の合金粉末作製工程では、水素吸蔵合金の塊を粉砕して、次述するアルカリ処理工程前の処理前水素吸蔵合金粉末２１を得る。
Next, a method for manufacturing the
First, in the alloy powder preparation process of step S1, the lump of the hydrogen storage alloy is pulverized to obtain a pretreatment hydrogen storage alloy powder 21 before the alkali treatment process described below.
次いで、ステップＳ２のアルカリ処理工程に進み、処理前水素吸蔵合金粉末２１についてアルカリ処理を行う。具体的には、処理前水素吸蔵合金粉末２１、及び、水酸化カリウム水溶液を混合して撹拌した。これにより、表面が活性化された水素吸蔵合金粉末２２ができる。 Then, it progresses to the alkali treatment process of step S2, and an alkali treatment is performed about the hydrogen storage alloy powder 21 before a process. Specifically, the pre-treatment hydrogen storage alloy powder 21 and an aqueous potassium hydroxide solution were mixed and stirred. Thereby, the hydrogen storage alloy powder 22 whose surface is activated is obtained.
なお、このアルカリ処理工程において、活性化された水素吸蔵合金粉末２２の表面には、Ｌａ（ＯＨ）3やＭｎ（ＯＨ）2などからなる粒子状の析出物Ｆが多数付着している。
処理前水素吸蔵合金粉末２１（水素吸蔵合金粉末２２）をなす金属元素の一部がアルカリ処理工程において、処理前水素吸蔵合金粉末２１から水酸化カリウム水溶液中に一旦溶出した後、この金属元素が水酸化物となって表面に析出して析出物Ｆとなる。
In this alkali treatment step, a large number of particulate precipitates F made of La (OH) 3 , Mn (OH) 2, etc. are attached to the surface of the activated hydrogen storage alloy powder 22.
A part of the metal element constituting the pre-treatment hydrogen storage alloy powder 21 (hydrogen storage alloy powder 22) is once eluted into the potassium hydroxide aqueous solution from the pre-treatment hydrogen storage alloy powder 21 in the alkali treatment step, and then the metal element is It becomes a hydroxide and precipitates on the surface to be a precipitate F.
次に、ステップＳ３の水洗工程に進み、ステップＳ２のアルカリ処理工程を終えた水素吸蔵合金粉末２２を水洗する。そして、ステップＳ４の加圧脱水工程に進み、上述の水洗工程で得た水素吸蔵合金粉末２２及び水からなるスラリーを加圧して脱水を行う。具体的には、まず、スラリーを、既知の加圧脱水装置の濾過室内に供給する。そして、この濾過室内に酸素を含む空気（大気）を所定量供給し、濾過室内の気圧を上昇させて、濾過室内のスラリーを空気により所定時間加圧（濾材に向けて 押圧）して、水素吸蔵合金粉末２２を空気にさらした。これにより、スラリーに含まれる水を、濾材を通して、濾過室の外部に排出する。 Next, it progresses to the water washing process of step S3, and the hydrogen storage alloy powder 22 which finished the alkali treatment process of step S2 is washed with water. And it progresses to the pressurization dehydration process of step S4, pressurizes the slurry which consists of the hydrogen storage alloy powder 22 and water which were obtained at the above-mentioned water washing process, and performs dehydration. Specifically, first, the slurry is supplied into a filtration chamber of a known pressure dehydration apparatus. Then, a predetermined amount of oxygen-containing air (atmosphere) is supplied into the filter chamber, the pressure in the filter chamber is increased, and the slurry in the filter chamber is pressurized with air for a predetermined time (pressed toward the filter medium) to generate hydrogen. The occluded alloy powder 22 was exposed to air. Thereby, the water contained in the slurry is discharged outside the filtration chamber through the filter medium.
次いで、ステップＳ５の粉末評価工程サブルーチンに進む。
この粉末評価工程サブルーチンでは、まず、図３に示すステップＳ５１の上澄み液取得工程に進み、ステップＳ４で加圧脱水した水素吸蔵合金粉末２２を所定条件下で水に投入し撹拌して上澄み液を取得する。具体的には、１００ｍＬ用のビーカに、水素吸蔵合金粉末２２を３０ｇ、及び、純水を１００ｇそれぞれ投入する。そして、スパチュラで１００回撹拌した後、１０分間放置した後の上澄み液を取採する。なお、本実施形態では、撹拌後、水素吸蔵合金粉末２２をより確実に沈殿させるため、撹拌後のビーカを、３０００−４０００ガウスの磁石上に載置した。
Next, the process proceeds to the powder evaluation process subroutine of step S5.
In this powder evaluation process subroutine, first, the process proceeds to the supernatant liquid obtaining process in step S51 shown in FIG. 3, and the hydrogen storage alloy powder 22 dehydrated under pressure in step S4 is poured into water under predetermined conditions and stirred to obtain a supernatant liquid. get. Specifically, 30 g of hydrogen storage alloy powder 22 and 100 g of pure water are put into a beaker for 100 mL. Then, after stirring 100 times with a spatula, the supernatant is taken after being left for 10 minutes. In this embodiment, after stirring, the beaker after stirring was placed on a 3000-4000 Gauss magnet in order to precipitate the hydrogen storage alloy powder 22 more reliably.
次に、ステップＳ５２の濁度測定工程に進み、上述の上澄み液取得工程で得た上澄み液の濁度Ｍを測定した。具体的には、日本電色工業（株）製HAZE meter(NDH4000)を用いて上澄み液の濁度Ｍを測定した。 Next, it progressed to the turbidity measurement process of step S52, and the turbidity M of the supernatant liquid obtained at the above-mentioned supernatant liquid acquisition process was measured. Specifically, the turbidity M of the supernatant was measured using a HAZE meter (NDH4000) manufactured by Nippon Denshoku Industries Co., Ltd.
なお、本発明者らの研究により、水素吸蔵合金粉末２２について、上述した上澄み取得工程（ステップＳ５１）で得た上澄み液の濁度Ｍが、後述するペースト作製工程で作製する負極合剤ペーストの塗着性と相関関係を有することが分かってきた。具体的には、濁度Ｍが低いと塗着性が良好となり、濁度Ｍが高いと塗着性が低い。
水素吸蔵合金粉末２２は、その表面に析出物Ｆが付着していないと、水素吸蔵合金粉末同士で凝集しやすい。また、水素吸蔵合金粉末２２の表面に付着する析出物Ｆは、負極合剤ペースト中に、粉末本体から分離して存在すると、合金粉末同士を適切に結着させる役割を果たす結着剤など、この負極合剤ペースト中の添加物と反応（例えば、ＣＭＣ（カルボキシルメチルセルロース）のＮａと置換）してこの添加物の機能を低下させてしまう。このため、負極合剤ペーストにおいて、水素吸蔵合金粉末２２から多くの析出物Ｆが分離すると、添加物（特に結着剤）はその機能が低下して、水素吸蔵合金粉末同士の間に介在できなくなるため、合金粉末同士が凝集してしまう。なお、水素吸蔵合金粉末２２を水中に分散する場合、粉末本体から分離する析出物Ｆ（析出物粒子）の量が多いほど、水中の濁度が高くなる。従って、高い濁度を示す上澄み液をなす水素吸蔵合金粉末２２を用いた負極合剤ペーストは、合金粉末同士が凝集して、低い塗着性を示す。逆に、低い濁度を示す上澄み液をなす水素吸蔵合金粉末２２を用いた負極合剤ペーストは、高い塗着性を示すと考えられる。
In addition, the turbidity M of the supernatant obtained in the above-described supernatant acquisition step (step S51) of the hydrogen-absorbing alloy powder 22 based on the research by the present inventors is that of the negative electrode mixture paste prepared in the paste preparation step described later. It has been found that there is a correlation with paintability. Specifically, when the turbidity M is low, the coatability is good, and when the turbidity M is high, the coatability is low.
If the deposit F does not adhere to the surface of the hydrogen storage alloy powder 22, the hydrogen storage alloy powder 22 tends to agglomerate with each other. Moreover, the precipitate F adhering to the surface of the hydrogen storage alloy powder 22 is separated from the powder body in the negative electrode mixture paste, and the binder serves to appropriately bond the alloy powders. It reacts with the additive in the negative electrode mixture paste (for example, substitutes for Na of CMC (carboxyl methyl cellulose)), and the function of the additive is lowered. For this reason, when many precipitates F are separated from the hydrogen storage alloy powder 22 in the negative electrode mixture paste, the function of the additive (especially the binder) is reduced, and can be interposed between the hydrogen storage alloy powders. As a result, the alloy powders aggregate. In addition, when disperse | distributing the hydrogen storage alloy powder 22 in water, the turbidity in water becomes high, so that there is much quantity of the deposit F (precipitate particle) isolate | separated from a powder main body. Therefore, in the negative electrode mixture paste using the hydrogen storage alloy powder 22 that forms a supernatant having high turbidity, the alloy powders are aggregated to exhibit low coatability. On the other hand, the negative electrode mixture paste using the hydrogen storage alloy powder 22 that forms a supernatant having low turbidity is considered to exhibit high coating properties.
この相関関係において、負極合剤ペーストが良好な塗着性になるよう、濁度Ｍに所定値を設けた。具体的には、ステップＳ５３で、濁度Ｍが所定値以下かどうかを判別する。ＹＥＳ、即ち上述の濁度測定工程で測定した濁度Ｍがこの所定値以下の場合、この水素吸蔵合金粉末を用いた負極合剤ペーストの塗着性は良好であるため、図２のステップＳ５のペースト作製工程に進む。一方、ＮＯ、即ち測定した濁度Ｍが所定値よりも高い場合には、前述した加圧脱水工程（ステップＳ４）における空気の供給量を増大させた（ステップＳ５４）。これにより、以降の加圧脱水工程では、空気の供給量を増大する前よりも、水中に分散させた場合に粉体本体から析出物Ｆが分離し難い水素吸蔵合金粉末２２とすることができる。 In this correlation, a predetermined value was set for the turbidity M so that the negative electrode mixture paste had good coatability. Specifically, in step S53, it is determined whether or not the turbidity M is a predetermined value or less. If YES, that is, if the turbidity M measured in the above turbidity measurement step is less than or equal to this predetermined value, the applicability of the negative electrode mixture paste using this hydrogen storage alloy powder is good, so step S5 in FIG. Proceed to the paste preparation process. On the other hand, when NO, that is, when the measured turbidity M is higher than the predetermined value, the air supply amount in the pressure dehydration step (step S4) described above is increased (step S54). As a result, in the subsequent pressure dehydration step, the hydrogen storage alloy powder 22 in which the precipitate F is difficult to separate from the powder body when dispersed in water, compared to before increasing the amount of air supply, can be obtained. .
ステップＳ６のペースト作製工程では、ステップＳ５２の濁度測定工程で測定した濁度Ｍが所定値以下であった水素吸蔵合金粉末２２を、いずれも図示しない導電剤、増粘剤及び結着剤（ＣＭＣ）と共に水と混練して負極合剤ペーストを作製する。
なお、水素吸蔵合金粉末２２は、前述の濁度Ｍが所定値以下であるため、これを用いた負極合剤ペースト内で析出物Ｆがこの水素吸蔵合金粉末２２本体から分離しがたく、負極合剤ペーストの塗着性を良好にすることができる。また、析出物Ｆが分離しないで多数付着しているため、負極合剤ペーストにおいて水素吸蔵合金粉末２２，２２同士が凝集し難く、互いに分散できる。
In the paste preparation process in step S6, the hydrogen storage alloy powder 22 in which the turbidity M measured in the turbidity measurement process in step S52 is not more than a predetermined value is used as a conductive agent, a thickener, and a binder (not shown). CMC) is mixed with water to prepare a negative electrode mixture paste.
The hydrogen storage alloy powder 22 has the above-described turbidity M of a predetermined value or less, and therefore the precipitate F is difficult to separate from the main body of the hydrogen storage alloy powder 22 in the negative electrode mixture paste using the hydrogen storage alloy powder 22. The coating property of the mixture paste can be improved. In addition, since a large number of precipitates F are adhered without being separated, the hydrogen storage alloy powders 22 and 22 hardly aggregate in the negative electrode mixture paste and can be dispersed with each other.
次に、ステップＳ７の負極板作製工程に進み、上述のペースト作製工程で作製した負極合剤ペーストを、多数の貫通孔が穿孔されたニッケルメッキ鋼板２８の貫通孔内及び両面に塗布した。その後、負極合剤ペーストの乾燥及び加圧を行って、負極板２０を作製した。 Next, it progressed to the negative electrode plate preparation process of step S7, and apply | coated the negative mix paste produced by the above-mentioned paste preparation process in the through-hole of nickel plating steel plate 28 with which many through-holes were pierced, and both surfaces. Thereafter, the negative electrode mixture paste was dried and pressed to prepare the negative electrode plate 20.
次いで、ステップＳ８の組立工程に進む。まず、負極板作製工程で作製した負極板２０のほか、水酸化ニッケルを含む正極合材ペーストを、発泡ニッケル基板に充填し、乾燥及び圧縮成形を行って作製した正極板３０と、セパレータ４０とを用意する。そして、複数の正極板３０と複数の負極板２０とを、１枚ずつセパレータ４０で挟んで交互に積層して、電極体１０とした（図１参照）。 Next, the process proceeds to the assembly process of step S8. First, in addition to the negative electrode plate 20 produced in the negative electrode plate production step, a positive electrode mixture paste containing nickel hydroxide is filled in a foamed nickel substrate, dried and compression molded, and a separator 40 and Prepare. Then, a plurality of positive electrode plates 30 and a plurality of negative electrode plates 20 were alternately stacked with the separators 40 sandwiched one by one to obtain an electrode body 10 (see FIG. 1).
次に、電極体１０を電槽７１内に収容し、図示しない正極端子及び負極端子に溶接した後、図示しない電解液を電槽７１内に注入した。その後、安全弁装置ＳＶを備える封口板７２で、電槽７１の開口を封止した。このようにして、電池１を作製した（図１参照）。
Next, after the electrode body 10 was accommodated in the
一方、本実施形態では、電池１の負極板２０に用いる水素吸蔵合金粉末２２の評価方法を、以下のように行った。
即ち、ステップＳ５１の上澄み液取得工程で、アルカリ処理を行い、水洗し脱水を済ませた水素吸蔵合金粉末２２を、前述の所定条件下で水に投入し撹拌して上澄み液を取得した。次いで、ステップＳ５２の濁度測定工程では、この上澄み液の濁度Ｍを測定し、このときの濁度Ｍから水素吸蔵合金粉末２２を評価した。
On the other hand, in this embodiment, the evaluation method of the hydrogen storage alloy powder 22 used for the negative electrode plate 20 of the
That is, in the supernatant liquid acquisition step of step S51, the hydrogen storage alloy powder 22 that had been subjected to alkali treatment, washed with water and dehydrated was put into water under the above-mentioned predetermined conditions and stirred to obtain a supernatant liquid. Next, in the turbidity measurement step of step S52, the turbidity M of this supernatant was measured, and the hydrogen storage alloy powder 22 was evaluated from the turbidity M at this time.
本実施形態にかかる水素吸蔵合金粉末２２の評価方法によれば、前述した、濁度Ｍと負極合剤ペーストの塗着性との間の相関関係を利用し、負極合剤ペーストを実際に作製する前に、負極合剤ペーストの塗着性及び水素吸蔵合金粉末２２の良否を評価することができる。 According to the evaluation method of the hydrogen storage alloy powder 22 according to the present embodiment, the negative electrode mixture paste is actually produced by using the correlation between the turbidity M and the coating property of the negative electrode mixture paste described above. Before performing, the applicability of the negative electrode mixture paste and the quality of the hydrogen storage alloy powder 22 can be evaluated.
また、本実施形態にかかる電池１の製造方法は、前述したペースト作製工程（ステップＳ６）と負極板作製工程（ステップＳ７）とを備えるため、ペースト作製工程では、所望の良好な塗着性を有する負極合剤ペーストを作製することができる。
しかも、水素吸蔵合金粉末２２がその表面に析出物Ｆを付着する表面付着合金粉末であるため、ペースト作製工程（ステップＳ６）で、表面付着合金粉末２２のうち、濁度Ｍが所定値以下の、従って析出物Ｆが分離しがたい粉末を用いて負極合剤ペーストを作製できる。かくして、塗着性の良好な負極合剤ペーストを用いて良好に塗着された負極板２０を備える電池１を製造できる。
Moreover, since the manufacturing method of the
Moreover, since the hydrogen storage alloy powder 22 is a surface-attached alloy powder that deposits the precipitate F on its surface, the turbidity M of the surface-attached alloy powder 22 is less than or equal to a predetermined value in the paste preparation step (step S6). Therefore, a negative electrode mixture paste can be produced using a powder in which the precipitate F is difficult to separate. Thus, the
また、本実施形態にかかる電池１の製造方法は、前述のアルカリ処理工程（ステップＳ２）、水洗工程（ステップＳ３）、加圧脱水工程（ステップＳ４）、上澄み液取得工程（ステップＳ５１）、濁度測定工程（ステップＳ５２）及びペースト作製工程（ステップＳ６）を備える。そして、このうちの濁度測定工程で測定した濁度Ｍが所定値よりも大きい場合には、脱水工程において空気の暴露量を増大させて、水素吸蔵合金粉末２２をさらす酸素の暴露量も増大させる。これにより、脱水工程では、暴露量の増大前よりも、粉末本体から析出物Ｆが分離し難い水素吸蔵合金粉末２２とすることができる。従って、負極合剤ペーストを作製するよりも前の段階にペーストの塗着性の低下するのを特定できると共に、濁度Ｍを確実に小さくすることができ、負極合剤ペーストとした場合に良好な塗着性を示す水素吸蔵合金粉末２２を用いて電池１を製造できる。なお、本実施形態では、水素吸蔵合金粉末２２を空気にさらしているが、この空気に含まれる酸素にさらすことで、粉末本体から析出物Ｆが分離し難い水素吸蔵合金粉末２２になると推察される。
Moreover, the manufacturing method of the
また、本実施形態にかかる電池１では、上澄み液取得工程（ステップＳ５１）で得た上澄み液の濁度Ｍが所定値以下の水素吸蔵合金粉末２２を、水と混練した負極合剤ペーストをニッケルメッキ鋼板２８に塗着して、負極活物質層２４を形成してなる。このため、良好な塗着性を有する負極合剤ペーストを用いて、良好に塗着された負極板２０を有する電池１とすることができる。
Further, in the
以上において、本発明を実施形態に即して説明したが、本発明は上記実施形態に限定されるものではなく、その要旨を逸脱しない範囲で、適宜変更して適用できることは言うまでもない。
例えば、実施形態では、水素吸蔵合金粉末の評価方法として、電池１の製造過程の中で水素吸蔵合金粉末２２の評価を行う例を示した。しかし、例えば、水素吸蔵合金粉末の評価を単独で（具体的には、前述したステップＳ５１及びステップＳ５２のみ）行っても良い。なお、このように単独で評価を行う場合、評価する水素吸蔵合金粉末として、その表面に析出物Ｆを付着する表面付着合金粉末のほかに、例えば、実施形態に記載のステップＳ１で作製した処理前水素吸蔵合金粉末２１を評価しても良い。
In the above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the above embodiment, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof.
For example, in the embodiment, as an evaluation method of the hydrogen storage alloy powder, an example in which the hydrogen storage alloy powder 22 is evaluated in the manufacturing process of the
１ 電池（ニッケル水素蓄電池）
２０ 負極板
２１ 処理前水素吸蔵合金粉末（水素吸蔵合金粉末）
２２ 水素吸蔵合金粉末（表面付着合金粉末）
２４ 負極活物質層
２８ ニッケルメッキ鋼板（基材）
Ｆ 析出物
Ｍ 濁度
1 battery (nickel metal hydride storage battery)
20 Negative electrode plate 21 Pretreatment hydrogen storage alloy powder (hydrogen storage alloy powder)
22 Hydrogen storage alloy powder (surface-attached alloy powder)
24 Negative electrode active material layer 28 Nickel-plated steel sheet (base material)
F Precipitate M Turbidity
Claims (1)
上記水素吸蔵合金粉末は、
その表面にアルカリ処理により析出した上記水素吸蔵合金粉末をなす金属元素の水酸化物からなる析出物が付着してなる表面付着合金粉末であり、
上記表面付着合金粉末を、少なくとも上記表面付着合金粉末の量、純水の量、攪拌条件、及び放置時間について予め定めた条件下で上記純水に投入し撹拌し、上澄み液を得る上澄み液取得工程と、
上記上澄み液の濁度を測定する濁度測定工程と、
上記上澄み液の濁度と上記表面付着合金粉末を水と混練してできた負極ペーストの塗着性との相関関係を利用して、測定した上記濁度から、上記表面付着合金粉末の良否を評価する評価工程と、を備える
水素吸蔵合金粉末の評価方法。 A hydrogen storage alloy powder evaluation method for evaluating the coating properties of a hydrogen storage alloy powder applied to a negative electrode plate of a nickel metal hydride battery,
The hydrogen storage alloy powder is
It is a surface-attached alloy powder formed by adhering a deposit made of a hydroxide of a metal element forming the hydrogen storage alloy powder deposited on the surface by alkali treatment,
The surface adhesion alloy powder in an amount of at least the surface adhesion alloy powder, the amount of pure water, stirring conditions, and standing time was poured into the pure water was stirred at a predetermined condition for the supernatant acquisition to obtain the supernatant Process,
A turbidity measuring step for measuring the turbidity of the supernatant,
Using the correlation between the turbidity of the supernatant and the applicability of the negative electrode paste formed by kneading the surface-adhesive alloy powder with water, the quality of the surface-adhesive alloy powder is determined from the measured turbidity. evaluation method of the hydrogen storage alloy powder and a evaluation step of evaluating.
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