Porous film silicon negative electrode material in high performance lithium ion battery and method for producing the same

摘要

Disclosed are a porous thin film silicon-based negative electrode material of a high-performance lithium ion cell and a preparation method thereof. The present invention adopts a three-dimensional porous current collector material, such as a copper foil mesh, a copper wire mesh, foamed copper, or foamed nickel. A magnetron sputtering method is used to form a layer of a silicon thin film or a silicon-metal composite thin film on the copper foil mesh, copper wire mesh, foamed copper, or foamed nickel, and then a three-dimensional porous thin film silicon-based negative electrode material is formed through heat treatment. In the present invention, with the forming of the three-dimensional porous structure and the silicon-metal alloy, and a fine bonding force between the thin film negative electrode material and the three-dimensional porous current collector, the cell prepared using the porous thin film silicon-based negative electrode material has high discharge capacity and initial charge-discharge efficiency, and good cycle performance. The method of the present invention is easy to operate, and has wide application prospect in the field of lithium cell negative electrode.