申请人:Ube Industries, Ltd.
公开号:EP1672729A1
公开(公告)日:2006-06-21
The present invention provides a lithium secondary battery which is improved particularly in cycle characteristics. Disclosed is a lithium secondary battery which uses a non-aqueous electrolytic solution obtained by dissolving electrolyte salt in a non-aqueous solvent. The non-aqueous electrolytic solution further contains a pentafluorophenyloxy compound represented by the formula (I), and vinylene carbonate and/or 1,3-propanesultone.
In the formula (I), R1 is a substituent selected from the group consisting of an alkylcarbonyl group having 2 to 12 carbon atoms, an alkoxycarbonyl group having 2 to 12 carbon atoms, an aryloxycarbonyl group having 7 to 18 carbon atoms, and an alkanesulfonyl group having 1 to 12 carbon atoms. At least one hydrogen atom of the substituent can be substituted with a halogen atom or an aryl group having 6 to 18 carbon atoms.
本发明提供了一种锂二次电池,该电池尤其在循环特性方面有所改进。本发明公开了一种锂二次电池,它使用的非水电解溶液是通过将电解质盐溶解在非水溶剂中获得的。该非水电解溶液还含有由式(I)表示的五氟苯氧基化合物、碳酸乙烯酯和/或 1,3-丙磺酸酮。
在式 (I) 中,R1 是一个取代基,选自具有 2 至 12 个碳原子的烷基羰基、具有 2 至 12 个碳原子的烷氧基羰基、具有 7 至 18 个碳原子的芳氧基羰基和具有 1 至 12 个碳原子的烷磺酰基组成的组。取代基中的至少一个氢原子可被卤素原子或具有 6 至 18 个碳原子的芳基取代。