| abstract |
The application provides a lithium ion battery, the lithium ion battery includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive pole piece, a negative pole piece and a separator. The positive active material in the positive pole piece simultaneously includes Li x Co y M1 1-y O 2-a Q1 a and Li l Ni m Con M2 p M3 q O 2-b Q2 b , Li x Co y M1 1 The mass ratio of ‑y O 2‑a Q1 a and Li l Ni m Con M2 p M3 q O 2‑b Q2 b is 1:1 to 9:1. The electrolyte contains additive A, which is a polynitrile-based six-membered nitrogen heterocyclic compound with low oxidation potential. The lithium-ion battery of the present application has excellent cycle performance and storage performance, especially in the case of high temperature and high voltage. |