申请人:Shenzhen Capchem Technology Co., Ltd
公开号:EP3664212A1
公开(公告)日:2020-06-10
To solve the problem of insufficient high-temperature cycle performance of the existing lithium-ion battery electrolyte, the application provides a non-aqueous electrolyte for lithium ion battery, comprising a compound A represented by structural formula I and a compound B represented by structural formula II.
Wherein, in formula I, R1 is selected from alkylene having 1-5 carbon atoms or fluorine substituted alkylene having 1-5 carbon atoms; R2 is selected from anyone of alkylene having 1-5 carbon atoms, fluorine substituted alkylene having 1-5 carbon atoms or carbonyl; In formula II, R3, R4, R5, R6, R7 and Rs are each independently selected from hydrogen, fluorine atom or a group containing 1-5 carbon atoms. The compound A and compound B of the non-aqueous electrolyte can form a passivation film formed by reduction, decomposition and combination reactions on the surface of negative electrode material of lithium-ion battery, thereby improving thermal stability of the passivation film and high-temperature cycle and storage performance of the battery.
为解决现有锂离子电池电解液高温循环性能不足的问题,本申请提供了一种锂离子电池用非水性电解液,由结构式 I 所代表的化合物 A 和结构式 II 所代表的化合物 B 组成。
其中,在式 I 中,R1 选自具有 1-5 个碳原子的亚烷基或具有 1-5 个碳原子的氟取代亚烷基;R2 选自具有 1-5 个碳原子的亚烷基、具有 1-5 个碳原子的氟取代亚烷基或羰基中的任意一种;在式 II 中,R3、R4、R5、R6、R7 和 Rs 各自独立地选自氢、氟原子或含有 1-5 个碳原子的基团。非水电解液中的化合物 A 和化合物 B 可在锂离子电池负极材料表面形成由还原、分解和结合反应形成的钝化膜,从而提高钝化膜的热稳定性和电池的高温循环及储存性能。