# US 2025/0158043 A1 · Anode material, negative electrode paste and lithium-ion battery

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- Number: US 2025/0158043 A1
- Document ID: US20250158043A1
- Status: Published application
- Kind: A1
- Application number: 19/023,881
- Filed: 2025-01-16
- Published: 2025-05-15
- Earliest claimed: 2023-09-22
- Assignees: Btr New Material Group Co., Ltd.; Dingyuan New Energy Technology Co., Ltd.
- Applicants: Btr New Material Group Co., Ltd.; Dingyuan New Energy Technology Co., Ltd.
- Inventors: Lijuan QU; Chunlei PANG; Wei XIE; Jianguo REN; Xueqin HE
- Web page: https://patentgrep.com/patent/US20250158043A1

## CPC

- H01M 4/366: {as layered products}
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/36: Selection of substances as active materials, active masses, active liquids
- H01M 4/364: {as mixtures}
- H01M 4/38: of elements or alloys
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- 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 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- 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 4/622: {being polymers}
- H01M 4/625: {Carbon or graphite}
- 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
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

An anode material, a preparation method therefor and a lithium-ion battery are provided. The anode material includes a silicon-based active substance and a coating layer located on at least a partial surface of the silicon-based active substance, and the silicon-based active substance includes silicon and a lithium silicate. The lithium-ion battery includes the anode material.

## Claims

### Claim 1

An anode material comprising:
a silicon-based active substance; and
a coating layer located on at least a partial surface of the silicon-based active substance,
wherein:
the silicon-based active substance comprises silicon and a lithium silicate;
as determined by an XRD ray diffraction method, in an X-ray diffraction spectrum of the anode material, a peak intensity of a strongest diffraction peak of the anode material in a 2θ range of 180 to 200 is A1, a peak intensity of a strongest diffraction peak in a 2θ range of 26° to 27.9° is A2, a peak intensity of a strongest diffraction peak in a 2θ range of 320 to 340 is A3, and A1+A2+A3 is equal to A;
a peak intensity of a strongest diffraction peak of the anode material in a 2θ range of 160 to 170 is B1, a peak intensity of a strongest diffraction peak in a 2θ range of 220 to 25.9° is B2, a peak intensity of a strongest diffraction peak in a 2θ range of 360 to 380 is B3, and B1+B2+B3 is equal to B;
a peak intensity of a strongest diffraction peak of the anode material in a 2θ range of 28° to 30° is C1, a peak intensity of a strongest diffraction peak in a 2θ range of 460 to 480 is C2, a peak intensity of a strongest diffraction peak in a 2θ range of 560 to 580 is C3, and C1+C2+C3 is equal to C; and
a relationship between the A, the B, and the C simultaneously meets: 0<(A+B)/C≤10 and 0<(A+C)/B≤5.

### Claim 2 (depends on 1)

The anode material according to claim 1, wherein the anode material is tested by using a powder resistivity tester, the anode material is tested to have a powder conductivity of σ1 at a powder density of ρ1, the anode material is tested to have a powder conductivity of σ2 at a powder density of ρ2, and a following relationship is met: (σ2−σ1)/(ρ2−ρ1)≤0.8.

### Claim 3 (depends on 1)

The anode material according to claim 1, wherein the relationship between the A, the B, and the C further meets: 1<(B+C)/A≤30.

### Claim 4 (depends on 1)

The anode material according to claim 1, wherein the silicon-based active substance further comprises a silicon-oxygen complex.

### Claim 5 (depends on 1)

The anode material according to claim 1, wherein a molar ratio of oxygen atoms to silicon atoms in the anode material is 0.5-2.

### Claim 6 (depends on 1)

The anode material according to claim 1, wherein the silicon in the anode material comprises nano-silicon grains, and an average particle size of the nano-silicon grains is 0 nm-20 nm excluding 0 nm.

### Claim 7 (depends on 1)

The anode material according to claim 1, wherein the lithium silicate comprises at least one of Li2SiO3, Li2Si2O5, and Li4SiO4.

### Claim 8 (depends on 1)

The anode material according to claim 1, wherein the coating layer comprises a carbon material, and a mass content of the carbon material in the anode material is equal to or less than 10%.

### Claim 9 (depends on 1)

The anode material according to claim 1, wherein a mass content of the silicon in the anode material is 20%-70%.

### Claim 10 (depends on 1)

The anode material according to claim 1, wherein a mass content of the lithium silicate in the anode material is 30%-75%.

### Claim 11 (depends on 1)

The anode material according to claim 1, wherein in that a specific surface area of the anode material is equal to or less than 10 m2/g.

### Claim 12 (depends on 1)

The anode material according to claim 1, wherein a pH value of the anode material is 7.2-11.0.

### Claim 13 (depends on 1)

The anode material according to claim 1, wherein an active material, carboxymethyl cellulose, conductive carbon black, and styrene butadiene rubber are mixed at a mass ratio of 95.3:1.3:1.5:1.9 to form a negative electrode paste with a solid content of 50%, wherein the active material comprises the anode material and graphite at a mass ratio of 9:1; a rheological property of the negative electrode paste is tested by using an HAAKE rotational rheometer of German to obtain a rheological curve of the negative electrode paste; and in the rheological curve, when shearing rates are 0 S−1, 150 S−1, and 300 S−1, corresponding shearing stresses in the rheological curve are τ0, τ1, and τ2, and a relationship between the shearing stresses meets: 2τ1>(τ2−τ0).

### Claim 14 (depends on 1)

A negative electrode paste comprising the anode material according to claim 1.

### Claim 15 (depends on 1)

A lithium-ion battery comprising the anode material according to claim 1.

### Claim 16 (depends on 4)

The anode material according to claim 4, wherein the silicon-oxygen complex comprises oxygen atoms and silicon atoms, and a molar ratio of the oxygen atoms to the silicon atoms is 0-2 excluding 0.

### Claim 17 (depends on 1)

The anode material according to claim 1, wherein the carbon material comprises at least one of amorphous carbon, graphene, graphite, carbon nanotubes, and carbon fibers.

### Claim 18 (depends on 14)

The negative electrode paste according to claim 14, wherein the negative electrode paste is formed by mixing the active material, carboxymethyl cellulose, conductive carbon black, and styrene butadiene rubber at a mass ratio of 95.3:1.3:1.5:1.9, wherein the active material includes the anode material and graphite at a mass ratio of 9:1.

### Claim 19 (depends on 18)

The negative electrode paste according to claim 18, wherein a rheological property of the negative electrode paste is tested by using an HAAKE rotational rheometer of German to obtain a rheological curve of the negative electrode paste; and in the rheological curve, when shearing rates are 0 S−1, 150 S−1, and 300 S−1, corresponding shearing stresses in the rheological curve are τ0, τ1, and τ2, and a relationship between the shearing stresses meets: 2τ1>(τ2−τ0).

### Claim 20 (depends on 15)

The lithium-ion battery according to claim 15, wherein the relationship between the A, the B, and the C further meets: 1<(B+C)/A≤30.