METHOD FOR PREPARING THREE-DIMENSIONAL POROUS SILICON BY TAKING SILICATE GLASS AS RAW MATERIAL

A method for preparing three-dimensional porous silicon by taking silicate glass as a raw material, comprising the following steps: mechanically milling silicate glass into powder; uniformly mixing the powder with magnesium powder and fused salt according to a certain ratio to undergo a reaction in an environment of inert gas; and acid-cleaning the reaction product to obtain three-dimensional porous silicon. Steps of the method are simple and easy to operate, include a wide range of raw materials, and facilitate formation of the three-dimensional porous silicon with a stable structure after reaction in a molten state. The prepared three-dimensional porous silicon has high purity, a large specific surface area, a uniform size of particles, has a mesoporous, and can be applied in the field of negative electrode materials of lithium ion batteries. La présente invention concerne un procédé de préparation de silicium poreux tridimensionnel en utilisant le verre de silice en tant que matière première, le procédé co