COMPOSITE SILICON POWDER EMBEDDING ALUMINUM-RICH NANOPARTICLES, PREPARATION METHOD FOR POWDER, AND APPLICATION THEREOF

摘要

A composite silicon powder embedding aluminum-rich nanoparticles, comprising a silicon particle substrate and aluminum-rich nanoparticles, the size of the silicon particle substrate being 0.2-3 μm, and the radius of the aluminum-rich nanoparticles being 3-10 nm. The silicon powder is prepared with the following raw materials in terms of weight percentage: industrial aluminum 85.1-99.0%, industrial silicon 0.9-14.8%, and a modifier 0.1-0.6%. Also disclosed is a preparation method for the composite silicon powder, which is produced by means of melting, cooling and curing, chemical corrosion, standing, centrifugation, and drying. Also disclosed is an application of the composite silicon powder. The silicon powder having embedded therein the aluminum-rich nanoparticles is structurally novel, reduces the hardness of the silicon powder, has a small particle size and a simple and controllable preparation process, is inexpensive, applicable as a negative electrode material of a lithium-ion battery, and capable for forming a nanochannel, and increases the initial discharge capacity and cycle performance of the lithium-ion battery.