JP3348770B2 - Battery separator and battery - Google Patents
Battery separator and batteryInfo
- Publication number
- JP3348770B2 JP3348770B2 JP01462998A JP1462998A JP3348770B2 JP 3348770 B2 JP3348770 B2 JP 3348770B2 JP 01462998 A JP01462998 A JP 01462998A JP 1462998 A JP1462998 A JP 1462998A JP 3348770 B2 JP3348770 B2 JP 3348770B2
- Authority
- JP
- Japan
- Prior art keywords
- graphite
- battery
- film
- separator
- battery separator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 17
- 229910002804 graphite Inorganic materials 0.000 claims description 17
- 239000010439 graphite Substances 0.000 claims description 17
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- 239000004743 Polypropylene Substances 0.000 claims description 8
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 239000012790 adhesive layer Substances 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000003522 acrylic cement Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 238000004804 winding Methods 0.000 description 4
- 239000008151 electrolyte solution Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- MYWGVEGHKGKUMM-UHFFFAOYSA-N carbonic acid;ethene Chemical compound C=C.C=C.OC(O)=O MYWGVEGHKGKUMM-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Secondary Cells (AREA)
- Cell Separators (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電池用セパレータ
ーに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery separator.
【０００２】[0002]
【従来の技術】近年、ノート型パソコンを初めとし、二
次電池の需要が伸びてきている。それに伴い、電池のエ
ネルギ密度向上に対する要求も強まり、電池ケースの軽
量化や薄膜化が求められている。また、形状の多様化も
進んでおり、成形性の向上が期待される。従来の電池は
正負極間にそれを分離するためのセパレーターが挟み込
まれ、捲回され電解液が封入された状態である。しかし
ながら、セパレーターと各電極は固定されていないた
め、ある程度の隙間が存在し体積あたりのエネルギー密
度の向上の阻害要因となっている。また、捲回時に両極
とセパレーターを同時に巻き合わせるため、フィルムの
位置精度も厳しく要求されており、捲回速度をＵＰさせ
ることができず生産性向上も困難であった。2. Description of the Related Art In recent years, demand for secondary batteries, including notebook type personal computers, has been increasing. Along with this, there is a growing demand for an improvement in the energy density of the battery, and there is a demand for a lighter and thinner battery case. In addition, diversification of the shape is progressing, and improvement in moldability is expected. A conventional battery is in a state where a separator for separating the battery is sandwiched between a positive electrode and a negative electrode, wound and filled with an electrolyte. However, since the separator and each electrode are not fixed, some gaps are present, which hinders the improvement of the energy density per volume. Further, since both the electrode and the separator are wound simultaneously at the time of winding, the positional accuracy of the film is strictly required, and the winding speed cannot be increased, and it is difficult to improve the productivity.
【０００３】[0003]
【発明が解決しようとする課題】本発明は従来の粘着セ
パレーターに替わり、捲回速度を大幅に向上でき、より
薄くてコンパクトなセパレーターを提供することにあ
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a thinner and more compact separator which can greatly increase the winding speed and replace the conventional adhesive separator.
【０００４】[0004]
【課題を解決するための手段】本発明は、ポリエチレン
フィルム、ポリプロピレンフィルム、あるいはその複合
フィルムの両面に黒鉛またはグラファイトを分散したア
クリル系の粘着剤を塗布してなる電池用セパレーターで
あって、粘着剤層の厚みが５〜１５μｍであり、電極フ
ィルムとの粘着強度が１０g/２cm以上であり、粘着剤層
が多孔質に形成されており、ＪＩＳ P８１１７ による
該フィルムの透気度が１００ccあたり８００秒以下であ
って、アクリル系粘着剤の分子量が１００万以上であ
り、硬化後のゲル分率が９０％以上である電池用セパレ
ーターである。更に好ましい形態としては、黒鉛または
グラファイトの添加量が、バインダー１００重量部に対
して７００〜１８００重量部であり、黒鉛またはグラフ
ァイトの平均粒径が0.1〜5.0μmである電池用セパレー
ターである。また、これらの電池用セパレーターを用い
てなる薄型カード電池である。SUMMARY OF THE INVENTION The present invention relates to a battery separator comprising a polyethylene film, a polypropylene film, or a composite film thereof coated on both sides with an acrylic adhesive in which graphite or graphite is dispersed. The thickness of the agent layer is 5 to 15 μm, the adhesive strength with the electrode film is 10 g / 2 cm or more, the adhesive layer is formed porous, and the air permeability of the film according to JIS P8117 is 800 per 100 cc. Second or less, the molecular weight of the acrylic pressure-sensitive adhesive is 1,000,000 or more, and the gel fraction after curing is 90% or more. A more preferred embodiment is a battery separator in which the addition amount of graphite or graphite is 700 to 1800 parts by weight based on 100 parts by weight of a binder, and the average particle size of graphite or graphite is 0.1 to 5.0 μm. Also, a thin card battery using these battery separators.
【０００５】[0005]
【発明の実施の形態】本発明に用いられる粘着剤の厚み
は５〜１５μｍであり、電極フィルムとの粘着強度が１
０g/２cm以上である。厚みは、好ましくは ８〜１０μ
ｍが良い。５μｍ未満では粘着強度が１０g/２cmを割っ
てしまい貼り合わせた後、ずれが発生してしまう。ま
た、１５μｍを越えると厚みが厚くなりすぎて通常の電
池よりも電極とセパレータの間隔が広くなってしまう。
黒鉛またはグラファイトの添加量はバインダー１００重
量部部に対して７００〜１８００重量部が好ましく、更
に好ましくは８００〜１２００重量部である。７００重
量部未満では粘着剤層が多孔質にならず、１８００重量
部を越えると塗工時に粘度が高すぎて均一な厚みに塗工
することが難しい。これら添加剤の平均粒径は好ましく
は０．１〜５．０μｍである。０．１μｍ未満では、塗
料化の際増粘してしまい塗料化が難しい。一方５．０μ
ｍを越えると凝集が著しく塗料の安定性に問題が発生す
る。BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive adhesive used in the present invention has a thickness of 5 to 15 μm and an adhesive strength to an electrode film of 1 to 1.
0 g / 2 cm or more. The thickness is preferably 8 to 10 μm
m is good. If it is less than 5 μm, the adhesive strength will be less than 10 g / 2 cm, and a displacement will occur after bonding. On the other hand, when the thickness exceeds 15 μm, the thickness becomes too large, and the distance between the electrode and the separator becomes wider than that of a normal battery.
The amount of graphite or graphite to be added is preferably 700 to 1800 parts by weight, more preferably 800 to 1200 parts by weight, based on 100 parts by weight of the binder. If the amount is less than 700 parts by weight, the pressure-sensitive adhesive layer will not be porous. The average particle size of these additives is preferably 0.1 to 5.0 μm. When the thickness is less than 0.1 μm, the viscosity increases during the formation of the coating, and it is difficult to form the coating. On the other hand, 5.0μ
If it exceeds m, agglomeration is remarkable and a problem occurs in the stability of the paint.
【０００６】更に、多孔質化された粘着剤付セパレータ
ーの透気度がＪＩＳ Ｐ８１１７により１００ccあたり
８００秒以下であり、好ましくは５００秒以下が良い。
なお、８００秒を越えると電解液中のLiイオン等のイオン移動
抵抗が大きくなり実用に適さない。本発明に用いられる
アクリル系粘着剤の分子量は１００万以上であり、硬化
後のゲル分率が９０％以上である。分子量が１００万未
満では、電解液による粘着剤層の劣化が発生してしま
う。また、ゲル分率も９０％未満では同様に耐電解液性
が悪く、実用に適さない。Further, the air permeability of the porous separator with an adhesive is 800 seconds or less per 100 cc according to JIS P8117, and preferably 500 seconds or less.
If the time exceeds 800 seconds, the ion transfer resistance of Li ions and the like in the electrolytic solution increases, which is not suitable for practical use. The molecular weight of the acrylic pressure-sensitive adhesive used in the present invention is 1,000,000 or more, and the gel fraction after curing is 90% or more. When the molecular weight is less than 1,000,000, the pressure-sensitive adhesive layer is deteriorated by the electrolytic solution. On the other hand, if the gel fraction is less than 90%, the electrolytic solution resistance is similarly poor, which is not suitable for practical use.
【０００７】[0007]
【実施例】以下に実施例を挙げて発明の効果を詳細に説
明するが、これは単なる例示であり本発明はこれに限定
されるものではない。ケースは図１に示した様にPP/PE/
PP三層からなる多孔質な多層フィルム上にアクリル系粘
着剤中に微小粒径黒鉛を添加したワニスを両面に塗工
し、熱処理を４０℃で４８時間行った後電池用粘着剤付
セパレーターを得た。また、得られたセパレーターの透
気度をＪＩＳ Ｐ８１１７により測定し、次にこのセパ
レーターと電極フィルムと貼り合わせた後、電解液（DE
C/EC=1/1）中で６０℃４８時間処理し、粘着力の測定を
行い、あわせて使用した粘着剤のゲル分率を測定した。
実施例及び比較例の電池ケース構成と測定結果を表１〜
３に示す。 注 ＰＰ ：ポリプロピレン ＰＥ ：ポリエチレン ＤＥＣ ：ジエチレンカーボネート ＥＣ ：エチレンカーボネートEXAMPLES The effects of the present invention will be described in detail below with reference to examples, but these are merely examples and the present invention is not limited thereto. The case is made of PP / PE /
A varnish obtained by adding fine particle size graphite in an acrylic adhesive is coated on both sides of a porous multi-layer film composed of three PP layers, and heat treatment is performed at 40 ° C. for 48 hours. Obtained. The air permeability of the obtained separator was measured according to JIS P8117, and then the separator and the electrode film were bonded together.
In C / EC = 1/1), the mixture was treated at 60 ° C. for 48 hours, the adhesive strength was measured, and the gel fraction of the used adhesive was also measured.
Tables 1 and 2 show battery case configurations and measurement results of Examples and Comparative Examples.
3 is shown. Note PP: Polypropylene PE: Polyethylene DEC: Diethylene carbonate EC: Ethylene carbonate
【０００８】[0008]
【表１】 [Table 1]
【０００９】[0009]
【表２】 [Table 2]
【００１０】[0010]
【表３】 [Table 3]
【００１１】[0011]
【発明の効果】本発明によれば、セパレーターに耐電解
液性を有し、かつ、微小粒径の黒鉛またはク゛ラファイトを高
充填した多孔質粘着剤層を両面に形成させ、セパレータ
ーと電極との密着性を付与することにより、セル体積を
削減し、かつ、電極とセパレーターの捲回時の位置合わ
せ工程をなくすことにより、体積あたりのエネルギー密
度を向上させ、セル組立時の捲回工程の生産性を大幅に
向上させた電池が得られる。このような電池は、近年の
エネルギ密度向上や生産性向上の要求に答えることがで
きる。According to the present invention, a porous pressure-sensitive adhesive layer having electrolyte resistance to a separator and highly filled with graphite or graphite with a fine particle diameter is formed on both surfaces, and the separator and the electrode are separated from each other. By providing adhesion, the cell volume is reduced, and the energy density per volume is improved by eliminating the positioning process when winding the electrode and the separator. A battery with greatly improved performance can be obtained. Such a battery can respond to recent demands for improvement in energy density and productivity.
【図1】本発明で使用されている粘着剤付セパレーター
の層構成を示す断面図。FIG. 1 is a cross-sectional view illustrating a layer configuration of a separator with an adhesive used in the present invention.
1：粘着剤層 2：ＰＰ／ＰＥ／ＰＰ多孔質フィルム 3：粘着剤層 1: adhesive layer 2: PP / PE / PP porous film 3: adhesive layer
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平６−236752（ＪＰ，Ａ) 特開 昭60−254562（ＪＰ，Ａ) 特開 平８−236093（ＪＰ，Ａ) 特開 平７−272710（ＪＰ，Ａ) 特開 平６−302314（ＪＰ，Ａ) 特開 平９−302109（ＪＰ，Ａ) 特開 昭58−82464（ＪＰ，Ａ) 特開 平８−83596（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 2/16 H01M 10/40 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-237552 (JP, A) JP-A-60-254562 (JP, A) JP-A-8-236093 (JP, A) JP-A-7-205 272710 (JP, A) JP-A-6-302314 (JP, A) JP-A-9-302109 (JP, A) JP-A-58-82464 (JP, A) JP-A-8-83596 (JP, A) (58) Field surveyed (Int.Cl. 7 , DB name) H01M 2/16 H01M 10/40
Claims (4)
フィルム、あるいはその複合フィルムの両面に黒鉛また
はグラファイトを分散したアクリル系の粘着剤を塗布し
てなる電池用セパレーターであって、粘着剤層の厚みが
５〜１５μｍであり、電極フィルムとの粘着強度が１０
g/２cm以上であり、粘着剤層が多孔質に形成されてお
り、ＪＩＳ P８１１７ による該フィルムの透気度が１
００ccあたり８００秒以下であって、アクリル系粘着剤
の分子量が１００万以上であり、硬化後のゲル分率が９
０％以上であることを特徴とする電池用セパレーター。1. A battery separator comprising an acrylic adhesive in which graphite or graphite is dispersed on both sides of a polyethylene film, a polypropylene film, or a composite film thereof, wherein the adhesive layer has a thickness of 5 to 15 μm. And the adhesive strength with the electrode film is 10
g / 2 cm or more, the pressure-sensitive adhesive layer is formed porous, and the air permeability of the film according to JIS P8117 is 1
800 cc or less per 00 cc, the molecular weight of the acrylic pressure-sensitive adhesive is 1,000,000 or more, and the gel fraction after curing is 9
0% or more of a battery separator.
インダー１００重量部に対して７００〜１８００重量部
である請求項１記載の電池用セパレーター。2. The battery separator according to claim 1, wherein the amount of graphite or graphite added is 700 to 1800 parts by weight based on 100 parts by weight of the binder.
０．１〜５．０μmである請求項１または２記載の電池
用セパレーター。3. The battery separator according to claim 1, wherein the graphite or graphite has an average particle size of 0.1 to 5.0 μm.
レーターを用いてなる薄型カード電池。4. A thin card battery using the battery separator according to claim 1, 2 or 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01462998A JP3348770B2 (en) | 1998-01-27 | 1998-01-27 | Battery separator and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01462998A JP3348770B2 (en) | 1998-01-27 | 1998-01-27 | Battery separator and battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11213980A JPH11213980A (en) | 1999-08-06 |
| JP3348770B2 true JP3348770B2 (en) | 2002-11-20 |
Family
ID=11866502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01462998A Expired - Fee Related JP3348770B2 (en) | 1998-01-27 | 1998-01-27 | Battery separator and battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3348770B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100770105B1 (en) | 2005-07-06 | 2007-10-24 | 삼성에스디아이 주식회사 | Lithium secondary battery |
| JP5541966B2 (en) * | 2009-08-06 | 2014-07-09 | 旭化成イーマテリアルズ株式会社 | Method for producing microporous membrane |
| KR20120062713A (en) | 2009-08-19 | 2012-06-14 | 미쓰비시 쥬시 가부시끼가이샤 | Separator for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery |
| KR101100990B1 (en) | 2009-12-15 | 2011-12-29 | 삼성에스디아이 주식회사 | Secondary battery |
| JP5632325B2 (en) * | 2011-04-20 | 2014-11-26 | 日東電工株式会社 | Adhesive tape for electrochemical devices |
| JP6064926B2 (en) * | 2014-02-07 | 2017-01-25 | ソニー株式会社 | Separator and battery |
| WO2015171595A1 (en) * | 2014-05-05 | 2015-11-12 | Daramic, Llc | Improved lead-acid battery separators, electrodes, batteries, and methods of manufacture and use thereof |
| KR101644860B1 (en) * | 2014-06-19 | 2016-08-03 | 주식회사 상보 | A adhesive tape for panel and a method for producing the same |
| CN114824660A (en) * | 2022-03-14 | 2022-07-29 | 郑州英诺贝森能源科技有限公司 | Ceramic microporous diaphragm for lithium ion battery and preparation method thereof |
-
1998
- 1998-01-27 JP JP01462998A patent/JP3348770B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11213980A (en) | 1999-08-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |