Lithium-ion battery negative electrode materials are a new type of material that can effectively improve the energy density and cycle life of batteries. Composed of silicon-based active materials and carbon-based conductive materials, silicon-carbon negative electrode materials are mainly divided into coated silicon-carbon negative electrodes, loaded silicon-carbon negative electrodes, and dispersed silicon-carbon negative electrodes according to the structural type.
Lithium-ion battery negative electrode materials are a type of silicon-based composite material. Silicon and carbon have similar chemical properties, and carbon-made negative electrode materials have small volume changes during charging and discharging, and have good cycle stability and conductivity. Therefore, carbon-made materials are often used as the preferred matrix for composite with silicon. Silicon-carbon composite materials combine the advantages of high conductivity and stability of carbon materials and high capacity of silicon materials. At present, silicon-carbon composite materials and silicon-oxygen composite materials are the main technical routes for silicon-based negative electrodes. Among them, silicon-carbon negative electrode refers to a mixture of nano-silicon and carbon materials, which is used to buffer the stress and deformation generated by silicon during the process of lithium ion insertion and extraction.
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