# US 10,319,997 B2 · Coated anode material and method of preparing the same

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- Number: US 10,319,997 B2
- Document ID: US10319997B2
- Status: Granted
- Kind: B2
- Application number: 15/207,790
- Filed: 2016-07-12
- Published: 2017-03-30
- Granted: 2019-06-11
- Earliest claimed: 2015-09-25
- Assignees: Microvast Power Systems Co., Ltd.
- Applicants: Microvast Power Systems Co., Ltd.
- Inventors: Wenjuan Liu Mattis; Jianhai Luo
- Web page: https://patentgrep.com/patent/US10319997B2

## CPC

- H01M 4/386: {Silicon or alloys based on silicon}
- C01B 33/021: Preparation (chemical coating from the vapour phase C23C16/00)
- H01M 4/0402: {Methods of deposition of the material}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/1395: of electrodes based on metals, Si or alloys
- H01M 4/58: of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 4/623: {fluorinated polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 4/366: {as layered products}
- H01M 10/052: Li-accumulators
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- 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}
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present application provides a coated anode material and a method of preparing the same. The coated anode material has a core-shell structure, wherein the core-shell structure includes an inert core and a shell coated on the inert core, the shell comprises an anode active material, and the inert core comprises a non-active material. In the coated anode material, the anode active material of the shell is distributed over the non-active material of the inert core, and the coated anode material can overcome the volume change problem of silicon particles during lithium insertion/deinsertion to a certain extent and obtain a better cycle performance and rate performance.

## Claims

### Claim 1

A coated anode material having a core-shell structure, wherein the core-shell structure includes an inert core being in the form of a particle and a shell coated on the inert core, the inert core has an average particle size of approximately 5 nm to approximately 200 nm, the shell has a thickness of approximately 2 nm to approximately 50 nm, the shell comprises an anode active material having a specific capacity of more than 500 mAh/g, and the inert core comprises a non-active material having a specific capacity of less than 50 mAh/g, wherein the anode active material of the shell is silicon, and the non-active material of the inert core is silicon carbide or silicon nitride.

### Claim 2 (depends on 1)

The coated anode material of claim 1, wherein the average particle size of the inert core is in the range of approximately 10 nm to approximately 100 nm.

### Claim 3 (depends on 1)

The coated anode material of claim 1, wherein the thickness of the shell is in the range of approximately 3 nm to approximately 10 nm.

### Claim 4 (depends on 1)

A lithium ion battery comprising the coated anode material of claim 1.