# US 12,009,513 B2 · Lithium-ion battery anode material and preparation method thereof, anode, and lithium-ion battery

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- Number: US 12,009,513 B2
- Document ID: US12009513B2
- Status: Granted
- Kind: B2
- Application number: 17/255,188
- Filed: 2019-06-19
- Published: 2021-09-09
- Granted: 2024-06-11
- Earliest claimed: 2018-06-22
- Assignees: BYD Company Limited
- Applicants: BYD Company Limited
- Inventors: Zhengfu Jiang; Shicai Li; Xiaopeng Jiao; Yongqing Gan; Xiao Shi
- Web page: https://patentgrep.com/patent/US12009513B2

## CPC

- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/1395: of electrodes based on metals, Si or alloys
- H01M 4/366: {as layered products}
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 4/587: for inserting or intercalating light metals
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- 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
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An anode material includes a core-shell structured composite material. The core-shell structured composite material includes a core material, an inner shell material, and an outer shell material. The core material includes graphite particles. The inner shell material includes a continuous phase and a dispersing phase. The dispersing phase includes nano silicon particles, the continuous phase includes carbon, and the outer shell material includes lithium metal. A chemical formula of the nano silicon-based particles is SiOx, 0<x<2.

## Claims

### Claim 1

A lithium-ion battery anode material, comprising:
a core-shell structured composite material, comprising:
a core material, an inner shell material, and an outer shell material, wherein:
the core material comprises graphite particles; and
the inner shell material comprises a continuous phase and a dispersing phase, wherein:
the dispersing phase comprises nano silicon-based particles,
wherein a chemical formula of the nano silicon-based particles is SiOx, 0<x<2; and
the continuous phase comprises carbon; and
the outer shell material comprises lithium metal, wherein:
an inner shell thickness of the core-shell structured composite material is 0.5 μm-2 μm; and
an outer shell thickness of the core-shell structured composite material is 0.1 μm-5 μm.

### Claim 2 (depends on 1)

The anode material according to claim 1, wherein an average particle size of the core-shell structured composite material is 5.6 μm-32 μm.

### Claim 3 (depends on 1)

The anode material according to claim 1, wherein:
the inner shell thickness of the core-shell structured composite material is 1 μm-1.5 μm; and
the outer shell thickness of the core-shell structured composite material is 1 μm-2 μm.

### Claim 4 (depends on 1)

The anode material according to claim 1, wherein:
an average particle size of the graphite particles is 5 μm-25 μm; and
an average particle size of the nano silicon particles is 10 nm-100 nm.

### Claim 5 (depends on 4)

The anode material according to claim 4, wherein:
the average particle size of the graphite particles is 15 μm-20 μm; and
the average particle size of the nano silicon particles is 30 nm-50 nm.

### Claim 6

A lithium-ion battery anode material comprising:
a core-shell structured composite material, comprising:
a core material, an inner shell material, and an outer shell material, wherein:
the core material comprises graphite particles; and
the inner shell material comprises a continuous phase and a dispersing phase, wherein:
the dispersing phase comprises nano silicon-based particles,
wherein a chemical formula of the nano silicon-based particles is SiOx, 0<x<2; and
the continuous phase comprises carbon; and
the outer shell material comprises lithium metal, wherein:
a weight ratio of the graphite particles to the nano silicon particles is 1:(0.02-0.2);
a weight ratio of the graphite particles to the carbon is 1:(0.03-0.3); and
a weight ratio of the graphite particles to the lithium metal is 1:(0.01-0.2).

### Claim 7 (depends on 6)

The anode material according to claim 6, wherein:
the weight ratio of the graphite particles to the nano silicon particles is 1:(0.1-0.15);
the weight ratio of the graphite particles to the carbon is 1:(0.1-0.15); and
the weight ratio of the graphite particles to the lithium metal is 1:(0.01-0.2).

### Claim 8 (depends on 1)

The anode material according to claim 1, wherein the carbon in the inner shell material is pyrolytic carbon.

### Claim 9 (depends on 1)

The anode material according to claim 1, wherein the core-shell structured composite material further comprises:
an inert material layer coated on the surface of the outer shell material,
wherein a material of the inert material layer comprises at least one of: Al2O3, LiF, Li3PO4, TiO2, Li3N or LiNO3.

### Claim 10

A lithium-ion battery, comprising a lithium-ion battery anode, the lithium-ion battery anode comprises:
a lithium-ion battery anode material, comprising:
a core-shell structured composite material, comprising:
a core material, an inner shell material, and an outer shell material, wherein:
the core material comprises graphite particles;
the inner shell material comprises:
a continuous phase, and
a dispersing phase, wherein:
the dispersing phase comprises nano silicon-based particles,
wherein a chemical formula of the nano silicon-based particles is SiOx, 0<x<2; and
the continuous phase comprises carbon; and
the outer shell material comprises lithium metal, wherein:
an inner shell thickness of the core-shell structured composite material is 0.5 μm-2 μm; and
an outer shell thickness of the core-shell structured composite material is 0.1 μm-5 μm.