Nonaqueous electrolyte, capacitor device using same, and carboxylic acid ester compound used in same
申请人:UBE INDUSTRIES, LTD.
公开号:US10263285B2
公开(公告)日:2019-04-16
The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics in the case of using an energy storage device at a high temperature and at a high voltage and further capable of inhibiting the gas generation while maintaining a capacity retention rate after storage at a high temperature and at a high voltage and also provides an energy storage device using the same. Disclosed is a nonaqueous electrolytic solution having an electrolyte salt dissolved in a nonaqueous solvent, the nonaqueous electrolytic solution containing a carboxylic acid ester compound represented by the following general formula (I).
In the formula, each of R1 and R2 independently represents a hydrogen atom, a —C(═O)—OR4 group, or the like, and R1 and R2 may be bonded to each other to form a ring structure. R3 represents a hydrogen atom or the like, and n represents an integer of 1 to 3. When n is 1, then L and R4 represent an alkyl group having 1 to 6 carbon atoms or the like; and when n is 2 or 3, then L represents an n-valent connecting group, X represents a —C(═O)— group, an —S(═O)— group, an —S(═O)2— group, an —S(═O)2—R5—S(═O)2— group or a CR6R7 group, R5 represents an alkylene group having 1 to 4 carbon atoms, and each of R6 and R7 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms.
本发明提供了一种非水性电解溶液,该溶液能够改善在高温高压下使用储能装置时的电化学特性,并且能够进一步抑制气体生成,同时在高温高压下储存后保持容量保持率,本发明还提供了使用该溶液的储能装置。本发明公开了一种非水电解溶液,该溶液具有溶解在非水溶剂中的电解质盐,该非水电解溶液含有由以下通式(I)代表的羧酸酯化合物。
式中,R1 和 R2 各自独立地代表氢原子、-C(═O)-OR4 基团或类似基团,R1 和 R2 可相互键合以形成环状结构。R3 代表氢原子或类似物,n 代表 1 至 3 的整数。当 n 为 1 时,L 和 R4 代表具有 1 至 6 个碳原子的烷基或类似基团;当 n 为 2 或 3 时,L 代表 n 价连接基团,X 代表-C(═O)-基团、-S(═O)-基团、-S(═O)2-基团、-S(═O)2-R5-S(═O)2-基团或 CR6R7 基团,R5 代表具有 1 至 4 个碳原子的亚烷基,R6 和 R7 分别代表氢原子或具有 1 至 6 个碳原子的烷基。