Patent ID: 10847802

Abstract:
Provided are a negative electrode, a method for preparing the negative electrode, and an electrochemical device. The negative electrode includes a current collector and a negative electrode active material layer disposed on at least one surface of the current collector and comprising a negative electrode active material. A porous inorganic dielectric layer is provided on a surface of the at least one negative electrode active material layer away from the current collector; a thickness of the porous inorganic dielectric layer is 20 nm-2000 nm, and the porous inorganic dielectric layer contains no binder. The negative electrode can alleviate lithium precipitation on negative electrode surface during large-current charging, stabilize negative electrode interface, and alleviate side reaction between the negative electrode and the electrolyte, thereby improving the cycle life of the battery, reducing short-circuit risk in the battery and improving high-temperature life of the battery.