申请人:Contemporary Amperex Technology Co., Limited
公开号:EP3809506A1
公开(公告)日:2021-04-21
The present application provides a lithium-ion battery and an apparatus, the lithium-ion battery includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separation film. The positive active material in the positive electrode sheet includes Lix1Coy1M1-y1O2-z1Qz1, 0.5≤x1≤1.2, 0.8≤y1<1.0, 0≤z1≤0.1, and M is selected from one of Al, Ti, Zr, Y, Q is selected from one or more of F, Cl and S. The electrolyte contains an additive A and an additive B, the additive A is a polynitrile six-membered nitrogen-heterocyclic compound with a relatively low oxidation potential, and the additive B is an aliphatic dinitrile or polynitrile compound with a relative ly high oxidation potential. The lithium-ion battery of the present application has superb cycle performance and storage performance, especially under high-temperature and high-voltage conditions.
本申请提供了一种锂离子电池和装置,锂离子电池包括电极组件和电解液。电极组件包括正极片、负极片和分离膜。正极片中的正极活性材料包括Lix1Coy1M1-y1O2-z1Qz1,0.5≤x1≤1.2,0.8≤y1<1.0,0≤z1≤0.1,M选自Al、Ti、Zr、Y中的一种,Q选自F、Cl和S中的一种或多种。电解液中含有添加剂 A 和添加剂 B,添加剂 A 是氧化电位相对较低的多腈六元氮杂环化合物,添加剂 B 是氧化电位相对较高的脂肪族二腈或多腈化合物。本申请的锂离子电池具有极佳的循环性能和存储性能,尤其是在高温高压条件下。