| abstract |
This application provides a lithium-ion battery and an apparatus (5). The lithium-ion battery (5) includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode plate, a negative electrode plate, and a separator. A positive active material of the positive electrode plate includes Li<sub>x1</sub>Co<sub>y1</sub>M<sub>1-y1</sub>O<sub>2-z1</sub>Q<sub>z1</sub>, where 0.5 ≤ x1 ≤ 1.2, 0.8 ≤ y1 < 1.0, 0 ≤ z1 ≤ 0.1, M is selected from one or more 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, an additive B, and an additive C. The additive A is a polynitrile six-membered nitrogen-heterocyclic compound with a relatively low oxidation potential. The additive B is an anhydride compound. The additive C is a halogen substituted cyclic carbonate compound. The lithium-ion battery (5) has superb cycle performance and storage performance, especially under high-temperature and high-voltage conditions. |