| abstract |
The invention discloses a preparation method of porous silicon powder, porous silicon powder and its application in lithium ion battery. The preparation method of porous silicon powder comprises the steps of mixing silicon powder, silver nitrate, copper nitrate, corrosion assistant, deionized water, hydrofluoric acid and hydrogen peroxide evenly and then corroding, and the corrosion assistant is methanol, ethanol, acetic acid, phosphoric acid, polymer At least one of ethylene glycol. The invention successfully uses the silver-copper bimetal assisted wet chemical etching method to prepare the porous silicon, which greatly reduces the preparation cost of the porous silicon powder. The performance is uniform and the pore size is uniform; the specific surface area is large, up to 56m 2 /g; the coin-type battery prepared based on the prepared silicon powder has a high discharge specific capacity after 50 cycles, up to 850mAh/g. |