How are silicon carbon materials composited?

Silicon carbon anode materials are mainly divided into:

1. Coated silicon carbon negative electrode, the coated silicon carbon negative electrode material is often carbon-coated silicon materials with different nanostructures. Such materials use silicon as the main body to provide reversible capacity, and the carbon layer is mainly used as a buffer layer to reduce the volume. effect while enhancing conductivity. The carbon coating is usually amorphous carbon.

2. Loaded silicon carbon anode, the loaded anode material is usually loaded or embedded in silicon films, silicon particles, etc. on the surface or inside of carbon materials with different structures (such as carbon fibers, carbon nanotubes, graphene, etc.). This kind of silicon carbon In composite materials, carbon materials often play the mechanical role of structural support. Their good mechanical properties are conducive to the release of volumetric stress of silicon during cycling, and the formed conductive network improves the overall electronic conductivity of the electrode.

3. Dispersed silicon carbon negative electrode, the dispersed silicon carbon negative electrode material is a relatively broad composite material system, including the physical mixing of silicon and different materials, and also a highly uniform dispersion composite system in which silicon carbon elements form molecular contact. It has been proved that evenly dispersing the silicon material into the carbon buffer matrix can suppress the volume expansion of silicon to a certain extent.