▎ 摘　　要

NOVELTY - Silicon-based negative electrode comprises a silicon-based core, carbon layer covering silicon-based core and a phenyl compound layer covering carbon layer. The phenyl compound in phenyl compound layer is (I). USE - Silicon-based negative electrode. ADVANTAGE - The silicon-based negative electrode material has stable performance and high cycle efficiency, which is beneficial to its wide application. It also provides a method for preparing a silicon-based negative electrode material, a negative electrode, a battery and an electronic device. DETAILED DESCRIPTION - Silicon-based negative electrode comprises a silicon-based core, carbon layer covering silicon-based core and a phenyl compound layer covering carbon layer. The phenyl compound in phenyl compound layer is formula (I). R1=carbon-carbon double bond or a carbon-carbon triple bond; and R2, R3, R4, R5, and R6=organic acid group. . An INDEPENDENT CLAIM is included for a method for preparing a silicon-based negative electrode material, which involves: (A) forming a carbon layer on the surface of the silicon-based core; and (B) forming phenyl compound layer on the surface of the carbon layer to obtain a silicon-based negative electrode material, where silicon-based negative electrode material includes a silicon-based core, the carbon layer coating the silicon-based core, and the phenyl compound layer coating the carbon layer.