ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE

An electrochemical device includes an electrode assembly and an electrolyte. The electrode assembly includes a negative electrode plate including a negative electrode active material layer. The negative electrode active material layer includes a negative electrode active material; and a negative electrode binder including an ester substance and a non-ester substance. Based on a mass of the negative electrode binder, a mass percentage of the ester substance is x; the electrolyte includes fluoroethylene carbonate and a high-kinetic solvent, the high-kinetic solvent includes at least one of ethyl propionate, propyl propionate, or diethyl carbonate. A ratio of a mass percentage of fluoroethylene carbonate to a mass percentage of the high-kinetic solvent in the electrolyte is y; and 17%≤x+y≤53%, y is from 0.4% to 14%. Based on a mass of the electrolyte, a mass percentage of fluoroethylene carbonate is from 0.1% to 10%.