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JP6417975B2 - Ion conductive solid electrolyte - Google Patents
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JP6417975B2 - Ion conductive solid electrolyte - Google Patents

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JP6417975B2
JP6417975B2 JP2015015576A JP2015015576A JP6417975B2 JP 6417975 B2 JP6417975 B2 JP 6417975B2 JP 2015015576 A JP2015015576 A JP 2015015576A JP 2015015576 A JP2015015576 A JP 2015015576A JP 6417975 B2 JP6417975 B2 JP 6417975B2
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門田 敦志
敦志 門田
海老沢 晃
晃 海老沢
純一 星野
純一 星野
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Description

本発明は、イオン導電性固体電解質に関する。 The present invention relates to an ion conductive solid electrolyte.

従来から知られているイオン導電性材料としては、無機材料を用いた無機固体電解質、有機高分子を用いた高分子固体電解質、水または非水溶媒を用いた液状電解質が挙げられる。   Conventionally known ion conductive materials include inorganic solid electrolytes using inorganic materials, polymer solid electrolytes using organic polymers, and liquid electrolytes using water or non-aqueous solvents.

また、固体と液体の中間的性質を有する液晶材料を用い、液晶材料が有する配向性等の特性を利用した固体電解質が提案されている(特許文献1参照)。固体電解質は形状が液体ではないので、部外への漏れがなく、耐熱性、信頼性、デバイスの小型化に対して液状電解質に比べ有利である。   In addition, a solid electrolyte using a liquid crystal material having an intermediate property between a solid and a liquid and utilizing characteristics such as alignment properties of the liquid crystal material has been proposed (see Patent Document 1). Since the solid electrolyte is not liquid, there is no leakage outside the unit, which is advantageous over the liquid electrolyte in terms of heat resistance, reliability, and device miniaturization.

この液晶材料を用いた固体電解質は、電池などの蓄電デバイスへの応用が期待されているものの、現状ではまだ高温下においてイオン導電性が得られているにすぎない。実際の使用を考慮した場合には、より低温でイオン導電性を示す固体電解質が望まれている。   Although the solid electrolyte using this liquid crystal material is expected to be applied to power storage devices such as batteries, at present, only ionic conductivity is obtained at high temperatures. In consideration of actual use, a solid electrolyte that exhibits ionic conductivity at a lower temperature is desired.

特開2012−116770号公報JP 2012-116770 A

本発明は、前記課題に鑑みてなされたものであり、良好なイオン導電性を有するイオン導電性固体電解質を提供することを目的とする。   This invention is made | formed in view of the said subject, and aims at providing the ion conductive solid electrolyte which has favorable ionic conductivity.

本発明にかかるイオン導電性固体電解質は、化学式(1)で示される化合物を含有することを特徴とする。

Figure 0006417975
〔化学式(1)において、R1は、炭素数6〜20のアルキル基、アルコキシ基、エチレンオキシド基を示す。Aは−O−(CH2)n−又は−(CH2)n−(式中、nは1〜20の整数を示す。)から選ばれる基を示す。Xは化学式(2)〜(5)から選ばれる基を示す。〕
Figure 0006417975
Figure 0006417975
Figure 0006417975
Figure 0006417975
The ion conductive solid electrolyte according to the present invention contains a compound represented by the chemical formula (1).
Figure 0006417975
[In chemical formula (1), R1 shows a C6-C20 alkyl group, an alkoxy group, and an ethylene oxide group. A represents a group selected from -O- (CH2) n- or-(CH2) n- (wherein n represents an integer of 1 to 20). X represents a group selected from chemical formulas (2) to (5). ]
Figure 0006417975
Figure 0006417975
Figure 0006417975
Figure 0006417975

化学式(1)で示される化合物が屈曲構造を取ることによる熱運動の向上とLiイオンの解離度向上の2つの作用が相乗的に働くことで、引用文献に示された化合物に比べ、より低い温度での導電性発現が実現できるものと推測される。   The compound represented by the chemical formula (1) is lower in comparison with the compound shown in the cited document due to the synergistic action of the two actions of improving thermal motion and improving the degree of dissociation of Li ions by taking a bent structure. It is assumed that the expression of conductivity at temperature can be realized.

本発明によれば、良好なイオン導電性を有するイオン導電性固体電解質を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the ion conductive solid electrolyte which has favorable ionic conductivity can be provided.

実施例1において、昇温させながら交流電圧を印加し電流測定を行った際の、温度と電流値の関係を示す図である。In Example 1, it is a figure which shows the relationship between temperature and an electric current value at the time of applying an alternating voltage while raising temperature and performing an electric current measurement. 比較例1において、昇温させながら交流電圧を印加し電流測定を行った際の、温度と電流値の関係を示す図である。In the comparative example 1, it is a figure which shows the relationship between temperature and an electric current value at the time of applying an alternating voltage and performing current measurement, raising temperature.

以下、本実施形態の好適な実施形態について説明する。ただし、本発明にかかるイオン導電性固体電解質は、以下の実施形態に限定されるものではない。   Hereinafter, preferred embodiments of the present embodiment will be described. However, the ion conductive solid electrolyte according to the present invention is not limited to the following embodiments.

本発明にかかるイオン導電性固体電解質は、化学式(1)で示される化合物を含む。 The ion conductive solid electrolyte concerning this invention contains the compound shown by Chemical formula (1).

Figure 0006417975
Figure 0006417975

式中のR1は、炭素数6〜20のアルキル基、アルコキシ基、エチレンオキシド基を示す。分岐状であっても直鎖状であっても良い。また、炭素数が6以上であればLiイオンを輸送するために必要な適度な分子運動を得ることが出来て好ましく、炭素数が20以下であれば、分子全体に占めるLiイオンの濃度を過度に下げることがないためより好ましい。   R1 in the formula represents an alkyl group having 6 to 20 carbon atoms, an alkoxy group, or an ethylene oxide group. It may be branched or linear. Further, if the number of carbon atoms is 6 or more, it is preferable to obtain an appropriate molecular motion necessary for transporting Li ions, and if the number of carbon atoms is 20 or less, the concentration of Li ions in the whole molecule is excessive. It is more preferable because it is not lowered.

式中のAは−O−(CH2)n−又は−(CH2)n−(式中、nは1〜20の整数を示す。)から選ばれる基を示す。(CH2)ユニットが1以上であればLiイオンを輸送するために必要な適度な分子運動を得ることが出来て好ましく、(CH2)ユニットが20以下であれば、分子全体に占めるLiイオンの濃度を過度に下げることがないためより好ましい。   A in the formula represents a group selected from -O- (CH2) n- or-(CH2) n- (wherein n represents an integer of 1 to 20). If the (CH2) unit is 1 or more, an appropriate molecular motion necessary for transporting Li ions can be obtained, and if the (CH2) unit is 20 or less, the concentration of Li ions in the entire molecule is preferable. It is more preferable because it is not excessively lowered.

式中のXは化学式(2)〜(5)から選ばれる基を示す。

Figure 0006417975
Figure 0006417975
Figure 0006417975
Figure 0006417975
X in the formula represents a group selected from chemical formulas (2) to (5).
Figure 0006417975
Figure 0006417975
Figure 0006417975
Figure 0006417975

分子間力を緩和し、分子の熱運動を向上させるという点において、Xは、化学式(2)もしくは化学式(3)で示される基がより好ましい。Xに存在する2つのメチル基もしくはフルオロメチル基が分子鎖から張り出すことでより効果的に分子間力を緩和していると推測される。   X is more preferably a group represented by the chemical formula (2) or the chemical formula (3) in that the intermolecular force is relaxed and the thermal motion of the molecule is improved. It is presumed that the intermolecular force is more effectively relaxed by extending two methyl groups or fluoromethyl groups present in X from the molecular chain.

化学式(1)で示される化合物を含有することによる効果発現のメカニズムははっきりとしないが、本発明者らは以下のように考えている。   Although the mechanism of the effect expression by containing the compound represented by the chemical formula (1) is not clear, the present inventors consider as follows.

化学式(1)の化合物は、2つのベンゼン環が1つの炭素原子もしくは1つの硫黄原子によって結合しており、この結合部分、つまりXの部分で屈曲した構造を取るため、このような構造では液晶性を発現することが出来ない。特許文献1に示された化合物のように液晶性を発現させるには、2つのベンゼン環を連結する結合子(Xに相当)の主鎖の数を偶数個として、直線構造を取る必要がある。   In the compound of the chemical formula (1), two benzene rings are bonded by one carbon atom or one sulfur atom, and take a structure bent at this bonded portion, that is, the X portion. Sex cannot be expressed. In order to exhibit liquid crystallinity like the compound shown in Patent Document 1, it is necessary to have a linear structure with an even number of main chains of the connector (corresponding to X) connecting two benzene rings. .

つまり、化学式(1)の化合物は、屈曲構造を取ることで液晶性は示さないものの、分子間力が適度に緩和されることで分子運動がしやすくなり、その熱運動によってLiイオンの動きが良くなるものと推測される。その結果、引用文献に示された化合物に比べ、より低い温度での導電性発現が実現できるものと考えられる。   In other words, although the compound of the chemical formula (1) does not exhibit liquid crystallinity due to the bent structure, the intermolecular force is moderately relaxed to facilitate the molecular motion, and the thermal motion causes the movement of Li ions. Presumed to improve. As a result, it is considered that the conductivity expression at a lower temperature can be realized as compared with the compound shown in the cited document.

また、Liイオンの解離度を高めることも重要である。スルホン酸基はリン酸基やカルボン酸基に比べて解離度の点で有利であるが、更なる改善のため化学式(1)の化合物のように、スルホン酸基の近傍にOH基を導入したところ、より低い温度での導電性発現を実現した。恐らく、OH基の電子供与性によりLiイオンが引き寄せられ、効果的にスルホン酸基からLiイオンを引き離すことが出来るものと考えられる。その結果、Liイオンの動きが良くなり、引用文献に示された化合物に比べ、より低い温度での導電性発現が実現できるものと推測される。   It is also important to increase the degree of Li ion dissociation. Sulfonic acid groups are advantageous in terms of dissociation compared to phosphoric acid groups and carboxylic acid groups, but an OH group was introduced in the vicinity of the sulfonic acid group as in the compound of chemical formula (1) for further improvement. However, the expression of conductivity at a lower temperature was realized. Presumably, Li ions are attracted by the electron donating properties of OH groups, and Li ions can be effectively separated from sulfonic acid groups. As a result, the movement of Li ions is improved, and it is presumed that the expression of conductivity at a lower temperature can be realized as compared with the compound shown in the cited document.

上述の2つの作用、すなわち、熱運動の向上とLiイオンの解離度向上の2つの作用が相乗的に働くことで、引用文献に示された化合物に比べ、より低い温度での導電性発現が実現できるものと推測される。   The above-mentioned two actions, namely, the two actions of improving the thermal motion and improving the degree of dissociation of Li ions, work synergistically, so that the expression of conductivity at a lower temperature is achieved compared to the compounds shown in the cited literature. It is speculated that it can be realized.

本発明にかかるイオン導電性固体電解質は、上述した化合物、金属塩以外に、ゲル化剤、ポリエチレンオキサイドなどのその他の成分を含んでいてもよい。その他の成分の含有率は、0.2モル%以下とすることが好ましい。   The ion conductive solid electrolyte concerning this invention may contain other components, such as a gelatinizer and a polyethylene oxide, in addition to the compound and metal salt which were mentioned above. The content of other components is preferably 0.2 mol% or less.

本発明にかかるイオン導電性固体電解質は、リチウムイオン電池、燃料電池などの各種デバイスへの適用が可能である。これらデバイスでは、不揮発性のイオン導電性固体電解質が求められているが、本発明にかかるイオン導電性固体電解質は十分に要求特性を満たすことができる。   The ion conductive solid electrolyte according to the present invention can be applied to various devices such as lithium ion batteries and fuel cells. In these devices, a nonvolatile ion conductive solid electrolyte is required, but the ion conductive solid electrolyte according to the present invention can sufficiently satisfy the required characteristics.

以下、実施例及び比較例を挙げて本発明について更に詳しく説明するが、本発明はこれらの実施例に何ら限定されない。   EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated in more detail, this invention is not limited to these Examples at all.

以下に示す手順により、実施例1〜8および比較例1のイオン導電性測定用サンプルを作製し、イオン導電性評価を行った。   Samples for measuring ion conductivity of Examples 1 to 8 and Comparative Example 1 were prepared by the procedure shown below, and ion conductivity evaluation was performed.

(実施例1)
まず、グローブボックス内でイオン導電性固体電解質の溶液を作製した。化学式(6)の化合物0.05gを2mlのアセトニトリルに溶解させた。
Example 1
First, an ion conductive solid electrolyte solution was prepared in a glove box. 0.05 g of the compound of the chemical formula (6) was dissolved in 2 ml of acetonitrile.

Figure 0006417975
Figure 0006417975

次に、イオン導電性測定用のサンプルを作製した。櫛形ITO電極を備えた基板(電極:縦1cm、横1cm、ランド:10μm、スペース:10μm、EHC社製)に、縦1cm、横1cmの四角穴を設けた厚さ70μmのマスキングテ−プを、電極部分以外がマスキングされるように貼り、当該四角穴に、前記溶液を100μL滴下した。自然乾燥させてアセトニトリルを揮発させた後、マスキングテ−プを剥がし、80℃で12時間真空乾燥した。   Next, a sample for measuring ion conductivity was prepared. A masking tape having a thickness of 70 μm provided with a square hole measuring 1 cm in length and 1 cm in width on a substrate (electrode: 1 cm in length, 1 cm in width, land: 10 μm, space: 10 μm, manufactured by EHC) with a comb-shaped ITO electrode The other portions than the electrode portion were masked so as to be masked, and 100 μL of the solution was dropped into the square hole. After natural drying to volatilize acetonitrile, the masking tape was peeled off and vacuum dried at 80 ° C. for 12 hours.

このように準備したイオン導電性測定用セルに対して、昇温させながら交流電圧を印加し、その時の電流値をモニターした。直流電圧ではなく交流電圧を印加したのは、電極界面でのイオンの焼き付きを防ぐためである。具体的には、任意波形ファンクションジェネレータ(AFG−2000、GW INSTEK社製)により、電圧6Vpp、方形波duty50、周波数1KHzの条件で交流電圧を印加し電流測定を行った。結果を図1に示す。また、電流値が0.1mAを示した時の温度を「電流の立ち上がり温度(℃)」とし、最大到達電流値を「到達電流値(mA)」とした。その結果を表1に示す。   An AC voltage was applied to the ion conductivity measurement cell prepared in this manner while raising the temperature, and the current value at that time was monitored. The reason why the AC voltage is applied instead of the DC voltage is to prevent the seizure of ions at the electrode interface. Specifically, an AC voltage was applied by an arbitrary waveform function generator (AFG-2000, manufactured by GW INSTEK) under the conditions of a voltage of 6 Vpp, a square wave duty of 50, and a frequency of 1 KHz, and current measurement was performed. The results are shown in FIG. Further, the temperature when the current value showed 0.1 mA was defined as “current rising temperature (° C.)”, and the maximum reached current value was defined as “arrival current value (mA)”. The results are shown in Table 1.

(実施例2)
化学式(6)の化合物を化学式(7)の化合物に変更する以外は、実施例1と同様にしてイオン導電性測定を行った。結果を表1に示す。

Figure 0006417975
(Example 2)
Ionic conductivity was measured in the same manner as in Example 1 except that the compound of the chemical formula (6) was changed to the compound of the chemical formula (7). The results are shown in Table 1.
Figure 0006417975

(実施例3)
化学式(6)の化合物を化学式(8)の化合物に変更する以外は、実施例1と同様にしてイオン導電性測定を行った。結果を表1に示す。

Figure 0006417975
(Example 3)
Ionic conductivity was measured in the same manner as in Example 1 except that the compound of the chemical formula (6) was changed to the compound of the chemical formula (8). The results are shown in Table 1.
Figure 0006417975

(実施例4)
化学式(6)の化合物を化学式(9)の化合物に変更する以外は、実施例1と同様にしてイオン導電性測定を行った。結果を表1に示す。

Figure 0006417975
Example 4
Ionic conductivity measurement was performed in the same manner as in Example 1 except that the compound of the chemical formula (6) was changed to the compound of the chemical formula (9). The results are shown in Table 1.
Figure 0006417975

(実施例5)
化学式(6)の化合物を化学式(10)の化合物に変更する以外は、実施例1と同様にしてイオン導電性測定を行った。結果を表1に示す。

Figure 0006417975
(Example 5)
Ionic conductivity was measured in the same manner as in Example 1 except that the compound of the chemical formula (6) was changed to the compound of the chemical formula (10). The results are shown in Table 1.
Figure 0006417975

(実施例6)
化学式(6)の化合物を化学式(11)の化合物に変更する以外は、実施例1と同様にしてイオン導電性測定を行った。結果を表1に示す。

Figure 0006417975
(Example 6)
Ionic conductivity measurement was performed in the same manner as in Example 1 except that the compound of the chemical formula (6) was changed to the compound of the chemical formula (11). The results are shown in Table 1.
Figure 0006417975

(実施例7)
化学式(6)の化合物を化学式(12)の化合物に変更する以外は、実施例1と同様にしてイオン導電性測定を行った。結果を表1に示す。

Figure 0006417975
(Example 7)
Ionic conductivity measurement was performed in the same manner as in Example 1 except that the compound of the chemical formula (6) was changed to the compound of the chemical formula (12). The results are shown in Table 1.
Figure 0006417975

(実施例8)
化学式(6)の化合物を化学式(13)の化合物に変更する以外は、実施例1と同様にしてイオン導電性測定を行った。結果を表1に示す。

Figure 0006417975
(Example 8)
Ionic conductivity was measured in the same manner as in Example 1 except that the compound of the chemical formula (6) was changed to the compound of the chemical formula (13). The results are shown in Table 1.
Figure 0006417975

(比較例1)
化学式(6)の化合物を化学式(14)の化合物に変更する以外は、実施例1と同様にしてイオン導電性測定を行った。結果を図2および表1に示す。

Figure 0006417975
(Comparative Example 1)
Ionic conductivity was measured in the same manner as in Example 1 except that the compound of the chemical formula (6) was changed to the compound of the chemical formula (14). The results are shown in FIG.
Figure 0006417975

実施例1〜8と比較例1との比較より、イオン導電性固体電解質が化学式(1)で示される化合物を含むことで、より低温でのイオン導電性と優れた電流値が確認された。 From comparison between Examples 1 to 8 and Comparative Example 1, it was confirmed that the ion conductive solid electrolyte contained a compound represented by the chemical formula (1), so that ion conductivity at a lower temperature and an excellent current value were obtained.

Figure 0006417975
Figure 0006417975

Claims (1)

化学式(1)で示される化合物を含有することを特徴とするイオン導電性固体電解質。
Figure 0006417975
〔化学式(1)において、R1は、炭素数6〜20のアルキル基、アルコキシ基、エチレンオキシド基を示す。Aは−O−(CH2)n−又は−(CH2)n−(式中、nは1〜20の整数を示す。)から選ばれる基を示す。Xは化学式(2)〜(5)から選ばれる基を示す。〕
Figure 0006417975
Figure 0006417975
Figure 0006417975
Figure 0006417975
An ion conductive solid electrolyte comprising a compound represented by the chemical formula (1).
Figure 0006417975
[In chemical formula (1), R1 shows a C6-C20 alkyl group, an alkoxy group, and an ethylene oxide group. A represents a group selected from -O- (CH2) n- or-(CH2) n- (wherein n represents an integer of 1 to 20). X represents a group selected from chemical formulas (2) to (5). ]
Figure 0006417975
Figure 0006417975
Figure 0006417975
Figure 0006417975
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