Production method of nanometer submicron spherical silicon powder

Abstract

The invention belongs to the technical field of inorganic non-metallic nano-micron powder material, and specifically relates to a production method of nanometer submicron silicon powder; nanometer spherical silicon is highly used for a high-energy-density silicon carbon negative electrode material of a lithium ion battery, so that energy ratio of the lithium ion battery is improved; therefore, forsolving the problems of low yield per unit, high cost and low quality of the existing nanometer silicon powder production method, particularly the problem in nanocrystallization of the silicon material in the high-energy-density silicon carbon negative electrode material of the lithium ion battery, a novel high-temperature gasification physical production method is provided; according to the method, polysilicon, monocrystal silicon or metal silicon powder are selected as the raw materials, and the nanoscale or submicron-scale spherical silicon powder is obtained through electric power heating-laser composite heating, high-temperature gasification, silicon evaporation high-temperature growth, cooling and collecting. By adoption of the production process, high-purity and high-quality nanometer silicon powder can be produced, wherein the grain diameter is in nanoscale (5-100nm) and submicron scale (0.1-10[mu]m), and the granularity can be accurately controlled; and in addition, the production process is less in waste gas, free of waste water and solid waste emission, and meanwhile, the production method is moderate in investment, high in yield and can be applicable to large scale production.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic nano-micron powder materials, and in particular relates to a production method of nano-submicron spherical silicon powder. technical background [0002] Nano-spherical silicon powder is mainly used as silicon-carbon anode material for high-energy-density lithium-ion batteries. In terms of the application of anode materials for lithium-ion batteries, silicon is considered to be the most promising anode material for a new generation of high-capacity lithium-ion batteries. Silicon-carbon composite materials are ideal for improving battery energy density and are the preferred choice for anode materials for high-energy density lithium-ion batteries. most preferred material. With the development of the three major fields of consumer batteries, power batteries and energy storage batteries, especially the rapid development of the new energy vehicle industry - in recent years, national poli...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of low production efficiency, large particle size, low purity, small output, high cost, and large pollution in the current production methods of nano-micron spherical silicon powder at home and abroad, the invention provides a new directed energy gasification production method