申请人:Contemporary Amperex Technology Co., Limited
公开号:US20210143476A1
公开(公告)日:2021-05-13
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 Li
x1
Co
y1
M
1-y1
O
2-z1
Q
z1
, 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, and Mg, and 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 relatively 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,该锂离子电池包括电极组件和电解质。电极组件包括正极片、负极片和隔膜。正极片中的正极活性材料包括Lix1Coy1M1-y1O2-z1Qz1,其中0.5≤x1≤1.2,0.8≤y1≤1.0,0≤z1≤0.1,M选自Al、Ti、Zr、Y和Mg中的一种,Q选自F、Cl和S中的一种或多种。电解质包含添加剂A和添加剂B,添加剂A是一种具有相对较低氧化电位的多腈六元氮杂环化合物,添加剂B是一种具有相对较高氧化电位的脂肪族二腈或多腈化合物。本申请的锂离子电池在高温和高电压条件下具有出色的循环性能和储存性能。