Preparation method of lithium ion battery nanoporous silicon negative electrode material

Abstract

The invention relates to a preparation method of lithium ion battery nanoporous silicon negative electrode material, and belongs to the technical field of new energy materials and electrochemistry. The silicon material crushed and finely ground into the micro-nano silicon powder in the protective gas atmosphere, and then crushing pretreatment is performed and the metal nanoparticles on the surfaceof the silicon powder are washed away and dried so as to obtain the nano silicon powder; one-step or two-step metal nanoparticle assisted chemical etching is performed on the nano silicon powder, solid-liquid separation and drying are performed so as to obtain nanoporous silicon / metal composite material; or a detergent is applied to remove the metal nanoparticles on the surface of the nanoporoussilicon, solid-liquid separation and drying are performed so as to obtain the nanoporous silicon; and the nanoporous silicon / metal composite material or the nano-porous silicon is oxidized so as to obtain an oxidized nano-porous silicon / metal composite material or oxidized nano-porous silicon, and the nanoporous silicon / metal composite material, the nanoporous silicon, the oxidized nanoporous silicon / metal composite material or the oxidized nanoporous silicon are the lithium ion battery nanoporous silicon negative electrode material.

Description

technical field

[0001] The invention relates to a preparation method of a nanoporous silicon negative electrode material for a lithium ion battery, and belongs to the technical fields of new energy materials and electrochemistry. Background technique

[0002] Among many energy storage systems, lithium-ion batteries are considered to be the most promising energy storage devices due to their advantages of long life, light weight, safe use, and environmental protection. In recent years, with the development of electric vehicles, hybrid vehicles and large-scale energy storage equipment, higher requirements have been put forward for the next generation of new lithium-ion batteries in terms of cost, energy density, rate performance and cycle stability. The low theoretical specific capacity (372mAh / g) of traditional graphite anode has been difficult to meet the application requirements of new high specific energy batteries. The development of high capacity, long life and safe lithi...

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