Secondary battery and electric apparatus

Abstract

A secondary battery includes a positive electrode plate, a negative electrode plate, a separator, and an electrolyte. The positive electrode plate includes a positive electrode current collector, and a positive electrode active material layer and an inorganic coating are provided on a surface of the positive electrode current collector. The electrolyte includes an additive, and the additive includes at least one of lithium difluorophosphate, succinonitrile, adiponitrile, 1,3,6-hexanetricarbonitrile, or 1,2,3-tris(2-oxyethoxy)propane. A mass per unit area of the inorganic coating is A g/m2, and based on a mass of the electrolyte, a mass percentage of the additive is B %, satisfying 0.01≤B/A≤5. Selection of the foregoing additives and control of B/A within the foregoing range are conducive to improving high-temperature safety performance of the secondary battery at high voltage.

Dependencies are inferred from the claim text.