Electrochemical device and electronic device

Abstract

An electrochemical device and an electronic device. The electrochemical device comprises an electrolyte and a positive electrode sheet, wherein the electrolyte comprises the compound of formula I, and the mass percentage content A of the compound of formula I is 0.01% to 7% on the basis of the total mass of the electrolyte; and the positive electrode sheet comprises a positive electrode active material layer, the positive electrode active material layer comprises nickel, and on the basis of the total mass of the positive electrode active material layer, the mass percentage content of nickel is B, where 0.1≤100A / B≤17.5. The electrochemical device has good high-temperature cycle performance and high-temperature storage performance.

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