Anode material, preparation method thereof and lithium ion battery

Patent metadata

Field	Value
Publication number	US-2025158041-A1
Application number	US-202519020738-A
Country	US
Kind code	A1
Filing date	Jan 14, 2025
Priority date	Dec 29, 2022
Publication date	May 15, 2025
Grant date	—

Abstract

An anode material, a method for preparing the same, and a lithium ion battery. The anode material includes a core and a first coating layer at least partially coating on a surface of the core. The core includes a silicon-based material, the first coating layer comprises a carbon material, and at least a part of a surface of the first coating layer is distributed with a fiber material. The fiber material and the anode material satisfy a formula (I):

D

w
⁢
i
⁢
r
⁢
e

D

1
⁢
0

×

1

exp
⁢

(
ρ
)

-
1

≤

0
.15

,

(
I
)

in the formula (I), D wire represents a minimum fiber diameter (nm) of the fiber material, D 10 represents a corresponding particle size (nm) when the cumulative particle size distribution number of the anode material reaches 10%, and ρ represents a powder conductivity (S/cm) of the anode material.

First claim

What is claimed is:

1 . An anode material, comprising:
a core; and a first coating layer at least partially coating on a surface of the core, wherein the core comprises a silicon-based material, the first coating layer comprises a carbon material, and at least a part of a surface of the first coating layer is distributed with a fiber material; and the fiber material and the anode material satisfy a formula (I):

D

w
⁢
i
⁢
r
⁢
e

D

1
⁢
0

×

1

exp
⁢

(
ρ
)

-
1

≤

0
.
1

⁢
5

(
I
)

wherein D wire represents a minimum fiber diameter (nm) of the fiber material, D 10 represents a corresponding particle size (nm) when the cumulative particle size distribution number of the anode material reaches 10%, and ρ represents a powder conductivity (S/cm) of the anode material.

2 . The anode material according to claim 1 , comprising at least one of:
a fiber diameter of the fiber material ranges from 2 nm to 200 nm; or interior of the first coating layer is distributed with the fiber material.

3 . The anode material according to claim 1 , comprising at least one of:
the fiber material comprises at least one of carbon fiber and silicon fiber; or the fiber material comprises at least one of carbon fiber and silicon fiber, and the carbon fiber comprises at least one of carbon fiber, carbon nanotube and polymer fiber.

4 . The anode material according to claim 1 , comprising at least one of:
the fiber material includes at least one of carbon fiber and silicon fiber, and the silicon fiber comprises at least one of silicon fiber and silicate fiber; the fiber material comprises at least one of carbon fiber and silicon fiber, the carbon fiber comprises at least one of carbon fiber, carbon nanotube and polymer fiber, and the polymer fiber comprises at least one of polypropylene fiber, polyester fiber, polyamide fiber, polyacrylic fiber, polymerase fiber and polyamine fiber; or the carbon material comprises at least one of amorphous carbon, graphite, graphene, and diamond-like carbon.

5 . The anode material according to claim 1 , comprising at least one of:
the first coating layer further comprises a salt substance and the salt substance comprises an inorganic salt and an organic salt; or the first coating layer further comprises a salt substance, the salt substance comprises an inorganic salt and an organic salt, and the inorganic salt comprises at least one of fluoride, lithium salt, carbonate, silicate, phosphate, nitrate, titanate, thioate and vanadate.

6 . The anode material according to claim 1 , comprising at least one of:
the first coating layer further comprises a salt substance, the salt substance comprises an inorganic salt and an organic salt, and the organic salt comprises at least one of a carboxylate, an alkoxide, and an aromatic salt compound; or the first coating layer further comprises a salt substance, and a thickness of the first coating layer ranges from 0.1 μm to 1.2 μm.

7 . The anode material according to claim 1 , comprising at least one of:
a thickness of the first coating layer ranges from 0.01 μm to 1 μm; or the first coating layer contains a first doping element, and the first doping element comprises at least one of N, P, B, S, O, F, Cl, Br, and I.

8 . The anode material according to claim 1 , comprising at least one of:
the first coating layer contains a first doping element, and a mass ratio of the first doping element in the first coating layer ranges from 0.01% to 5%; or the core comprises at least one of crystalline silicon and silicide.

9 . The anode material according to claim 1 , comprising at least one of:
the core comprises at least one of crystalline silicon and a silicide, the silicide comprises at least one of silicate, silicon oxide, silicon phosphide, silicon carbide, silicon nitride, and silicon alloy; or a mass ratio of the metal element in the core ranges from 0 to 15%, and the metal element comprises at least one of lithium, sodium, magnesium, aluminum, copper, titanium, boron, beryllium, calcium, vanadium, chromium, lanthanum and selenium.

10 . The anode material according to claim 1 , further comprising at least a second coating layer disposed between the core and the first coating layer, or a second coating layer disposed on a region of the core surface that is not coated by the first coating layer.

11 . The anode material according to claim 10 , wherein the second coating layer comprises at least one of:
a salt substance, wherein the salt substance comprises an inorganic salt and an organic salt; or a salt substance wherein the salt substance comprises an inorganic salt and an organic salt, and the inorganic salt comprises at least one of fluoride, lithium salt, carbonate, silicate, phosphate, nitrate, titanate, thioate and vanadate.

12 . The anode material according to claim 10 , wherein the second coating layer comprises at least one of:
a salt substance, wherein the salt substance comprises an inorganic salt and an organic salt, and the organic salt comprises at least one of a carboxylate, an alkoxide, and an aromatic salt compound; a salt substance wherein the salt substance has a mass ratio of the salt substance in the anode material ranges from 0.01 wt % to 3.0 wt %; or a thickness of the second coating layer ranging from 0 μm to 1 μm.

13 . The anode material according to claim 1 , comprising at least one of:
the anode material comprises a salt substance, and a mass ratio of the salt substance ranges from 0 wt % to 3.0 wt %; or a mass ratio of the carbon element in the anode material ranges from 0.5 wt % to 10 wt %.

13 . The anode material according to claim 1 , comprising at least one of:
a median particle size D 50 of the anode material ranges from 2.0 μm to 10.0 μm; or a particle size D 10 with a particle cumulative distribution of 10% in the anode material ranges from 0.5 μm to 4 μm.

14 .

Assignees

• Btr New Mat Group Co Ltd
• Dingyuan New Energy Tech Co Ltd

Inventors

• Xie Wei
• Pang Chunlei
• Deng Zhiqiang
• Ren Jianguo
• He Xueqin

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• C01B33/113

  Silicon oxides; Hydrates thereof {(preparing monoxide by reduction of siliceous material C01B33/182)} · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title