# US 10,770,722 B2 · Method for preparing silicon nanocomposite dispersion using plasma, and anode active material and lithium secondary battery using same

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- Number: US 10,770,722 B2
- Document ID: US10770722B2
- Status: Granted
- Kind: B2
- Application number: 15/540,012
- Filed: 2015-04-03
- Published: 2017-12-21
- Granted: 2020-09-08
- Earliest claimed: 2014-04-15
- Applicants: Kab Young Moon
- Inventors: Kab Young Moon
- Web page: https://patentgrep.com/patent/US10770722B2

## CPC

- H01M 4/366: {as layered products}
- H01M 4/0416: {involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence)}
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 10/052: Li-accumulators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01B 2203/0861: by plasma
- C25B 11/059: Silicon
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C}
- C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present invention relates to a method for easily producing nanoparticles by expansion, explosion, vaporization, condensation and cooling of plasma in a liquid by means of heat resistance and, more particularly, to a method for preparing a silicon nanocomposite dispersion having a uniform carbon layer coated on the surface of silicon of which at least one area is connected to a silicon carbide formed by reacting a carbon in liquid (C) during expansion, explosion, vaporization, condensation and cooling, and applied products thereof.

## Claims

### Claim 1

A silicon nanocomposite consisting of:
a silicon nanoparticle having an average diameter of 100-300 nm; and
a silicon carbide bonding which is configured on at least one region of a surface of the silicon nanoparticle with a thickness of 0.1-0.5 nm, wherein:
a surface area where the silicon carbide bonding is formed, as compared to a whole surface area of the silicon nanoparticle, accounts for 10-50%, and
a surface of the silicon nanocomposite further includes a carbon layer of a thickness of 3-15 nm.