Silicon-carbon composite material and preparation method thereof, secondary battery, and electric apparatus

Abstract

A silicon-carbon composite material, a preparation method therefor, a secondary battery, and an electric apparatus are provided. The silicon-carbon composite material includes a carbon matrix having a pore structure and a silicon-based material distributed in the pore structure. The material is characterized using a button battery by plotting a differential capacity (dQ/dV) versus voltage curve obtained from a charge-discharge process. A maximum value of dQ/dV within a voltage range of 0.26 V to 0.35 V is defined as VA, and a maximum value of dQ/dV within a voltage range of 0.42 V to 0.52 V is defined as VB, wherein a ratio VA/VB is greater than or equal to 1.40. The silicon-carbon composite material exhibits improved cycling performance and enhanced first-cycle charge-discharge efficiency.

Dependencies are inferred from the claim text.