Two-dimensional porous silicon, and preparation method and use thereof in lithium ion batteries

Abstract

A two-dimensional porous silicon, and a preparation method and use thereof in lithium ion batteries. A silicocalcium powder is soaked in a hydrochloric acid solution, filtered under suction after reaction, and dried to obtain a siloxene powder. The siloxene powder is thermally treated in a vacuum environment, in which siloxene is oxidized into SiOx during the heating process, and SiOx is disproportionated in further high-temperature treatment to produce uniformly distributed two-dimensional Si/SiO2. The two-dimensional Si/SiO2 is soaked in a hydrofluoric acid solution, in which hydrofluoric acid reacts with SiO2. After complete reaction, a two-dimensional silicon material having a porous structure is obtained after repeatedly centrifugation and washing, and drying under vacuum. The two-dimensional porous silicon has a crystal structure and an ultra-thin lamellar structure, effectively alleviate the volume change of the negative electrode material, and accelerate the diffusion of lithium ions when used in a lithium ion battery.

Dependencies are inferred from the claim text.