Silicon-carbon composite material for negative electrodes and its application

Abstract

Silicon-carbon composite material for negative electrodes, comprising a carbon matrix and silicon particles, wherein the carbon matrix contains silicon particles, wherein a carbon coating layer is applied to the surface of the silicon-carbon composite material for negative electrodes, wherein the silicon-carbon composite material for negative electrodes corresponds to the equation of T / O = 1.25~2.45, where (1-α) at ​​T = 15 · (1-α) / γ represents a completeness of the carbon coating layer on the surface of the silicon-carbon composite material for negative electrodes, and γ nm represents a mean carbon coating layer thickness, where O represents a degree of order of the silicon-carbon composite material for negative electrodes.