Secondary battery and preparation method therefor, and electric device

Abstract

The present application relates to a secondary battery and a preparation method therefor, and an electric device. The secondary battery comprises a positive electrode sheet, a negative electrode sheet, and an electrolyte. The positive electrode sheet comprises a positive electrode film layer; the positive electrode film layer comprises a positive electrode active material and a positive electrode electrolyte interface film; and the positive electrode electrolyte interface film comprises Li2MO4, wherein M comprises chalcogens. The electrolyte comprises a solvent and a lithium salt, and further comprises at least one of a lithium metal chelate and an additive capable of being combined with lithium ions to form a chelate.

Dependencies are inferred from the claim text.