Silicon-carbon composite material as well as preparation method and application thereof

The invention relates to the technical field of electrode plates, in particular to a silicon-carbon composite material and a preparation method and application thereof.The silicon-carbon composite material is of a novel yolk-shell structure, an inner core is a silicon material, an outer layer is a carbon shell, the inner core is the silicon material, the outer layer is the carbon shell, a cavity is formed between the carbon shell and the silicon material, and the carbon shell and the silicon material are connected through a conductive agent; a cavity structure between the carbon shell and the silicon material can effectively relieve stress generated by volume expansion of silicon in the charging and discharging process; and the conductive agent in the cavity can also be used as a rapid channel for electron transmission, so that the conductivity of the silicon-carbon composite material is improved, the rate capability of the composite material is ensured, and the application prospect is very good. 本发明涉及电极极片技术领