SILICON-CONTAINING ACTIVE MATERIAL FOR NEGATIVE ELECTRODE AND METHOD FOR ITS PRODUCTION Russian patent published in 2021 - IPC H01M4/02 H01M4/04 

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering, in particular to the active material of the negative electrode of a battery and a method for its manufacture. The technical result of the invention is to provide a high capacity and increase the service life of the negative electrode by preventing mechanical destruction of the active material of the negative electrode by limiting the contact of silicon with the electrolyte solution by covering the silicon particles with a layer of SiO_x, where x≤1. The resulting material is a "core-shell" structure, where the silicon core is covered with a SiO_x layer 1-2 nm thick. The method for producing Si-SiO_x structures includes the synthesis of silicon nanoparticles of a given size by decomposition of monosilane (SiH₄) mixed with an Ar carrier gas in an argon plasma flow, followed by oxidation of the surface of Si nanoparticles to SiO_x.

EFFECT: higher capacity and increased service life of the negative electrode.

2 cl, 2 dwg, 2 ex