US 12,183,919 B2 · Silicon-oxygen composite negative electrode material and method for preparation thereof and lithium-ion battery

Abstract

The present application provides a silicon-oxygen composite negative electrode material and method for preparation thereof and lithium-ion battery. The silicon-oxygen composite negative electrode material comprises a silicon-oxygen composite negative electrode material comprising SiOx, non-Li2Si2O5 lithium-containing compound, and Li2Si2O5; said Li2Si2O5 is coated on the surface of the non-Li2Si2O5 lithium-containing compound; 0≤x≤1.2. The preparation method comprises: mixing a first silicon source with a reducing lithium source and roasting, to obtain a composite material containing a non-Li2Si2O5 lithium-containing compound; the composite material containing the non-Li2Si2O5 lithium-containing compound is fused with a second silicon source and then subjected to heat treatment to obtain a silicon-oxygen composite negative electrode material. The silicon-oxygen composite anode material provided by the present application is coated with Li2Si2O5, solving the problem in the prior art of a negative electrode material producing strong alkaline or easily soluble by-products in water after pre-lithiation and affecting subsequent processing.

Claims20

Dependent claims

A silicon-oxygen composite negative electrode material, comprising SiOx, a non-Li2Si2O5 lithium-containing compound and Li2Si2O5, wherein the Li2Si2O5 covers a surface of the non-Li2Si2O5 lithium-containing compound, wherein 0≤x≤1.2, and the silicon-oxygen composite negative electrode material has a pH value of 7<pH<11, and the Li2Si2O5 has a thickness of 100 nm to 5000 nm.

A method for preparing a silicon-oxygen composite negative electrode material, comprising steps of:

mixing a first silicon source SiOy with a reductive lithium source and roasting a mixture, so as to obtain a composite material, wherein the composite material comprises a non-Li2Si2O5 lithium-containing compound, wherein 0<y<2;
and
fusing the composite material with a second silicon source and then performing a heat treatment, so as to obtain the silicon-oxygen composite negative electrode material, wherein the silicon-oxygen composite negative electrode material comprises SiOx, the non-Li2Si2O5 lithium-containing compound and Li2Si2O5, wherein the Li2Si2O5 covers a surface of the non-Li2Si2O5 lithium-containing compound, wherein 0≤x≤1.2, wherein the silicon-oxygen composite negative electrode material has a pH value of 7<pH<11, and the Li2Si2O5 has a thickness of 100 nm to 5000 nm.

Dependencies are inferred from the claim text.

Facts

Application

17/420,570Filed 28 Oct 2020

Priority

CN 201911046596.830 Oct 2019

Published

US 2022/0115652 A114 Apr 2022

Granted

31 Dec 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification18 codes

C01B 33/113
Silicon; Compounds thereof: silicon oxides; Hydrates thereof
H01M 4/48
Selection of substances as active materials, active masses, active liquids: of inorganic oxides or hydroxides
C01B 33/18
Silica; Hydrates thereof, e.g. lepidoic silicic acid: preparation of finely divided silica neither in sol nor in gel form; After-treatment thereof
H01M 4/0471
Processes of manufacture in general: involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal…

Silicon-oxygen composite negative electrode material and method for preparation thereof and lithium-ion battery

Life of this patent

Silicon-oxygen composite negative electrode material and method for preparation thereof and lithium-ion battery

Life of this patent

Abstract

Claims20