Anode material, preparation method thereof, and battery

Patent metadata

Field	Value
Publication number	US-2025154015-A1
Application number	US-202519019946-A
Country	US
Kind code	A1
Filing date	Jan 14, 2025
Priority date	Sep 28, 2023
Publication date	May 15, 2025
Grant date	—

Abstract

Relating to the field of anode materials, and an anode material, a preparation method thereof, and a battery provided. The anode material includes a silicon-based active material and a lithium silicate, and the anode material further includes a Mg element, an Al element, and a P element, where the Mg element accounts for a mass content of a % in the anode material, the Al element accounts for a mass content of b % in the anode material, the P element accounts for a mass content of c % in the anode material, and in the anode material, a, b and c satisfy the following relational expressions: 0.3≤(a+b)/c≤1.5, and 0.5≤a+b+c≤10. By introducing a Mg, an Al, and a P elements, the anode material facilitates to form a lithium ion transport channel, improving rate of the anode material.

First claim

What is claimed is:

1 . An anode material comprising a silicon-based active material and a lithium silicate;
the anode material further comprises a Mg element, an Al element, and a P element, wherein the Mg element accounts for a mass content of a % in the anode material, the Al element accounts for a mass content of b % in the anode material, the P element accounts for a mass content of c % in the anode material, and in the anode material, a, b and c satisfy the following relational expressions:

0.3
≤

(

a
+
b

)

/
c

≤
1.5

,

and

0.5

≤

a
+
b
+
c

≤

1
⁢

0
.

2 . The anode material of claim 1 , wherein the anode material comprises at least one of the following features (1) and (2):
(1) the silicon-based active material comprises a silicon grain with a grain size of ≤20 nm; and (2) the silicon-based active material comprises silicon and/or silicon oxide.

3 . The anode material of claim 1 , wherein, in the anode material, 0.002≤a/b≤2.

4 . The anode material of claim 1 , wherein the anode material comprises at least one of the following features (1) to (3):

0
.
0

⁢
0
⁢
1

≤
a
≤
0.065

;

(
1
)

0.09

<
¯

b
≤
0.55

;
and

(
2
)

0.15
≤
c

<
¯

0
.
7

⁢

0
.

(
3
)

5 . The anode material of claim 1 , wherein the anode material further comprises a carbon layer.

6 . The anode material of claim 5 , wherein the anode material comprises at least one of the following features (1) to (3):
(1) the carbon layer comprises at least one of an amorphous carbon material and a graphitized carbon material; (2) the carbon layer comprises an amorphous carbon material, wherein the amorphous carbon material comprises at least one of amorphous carbon, carbon black, and activated carbon; and (3) the carbon layer comprises a graphitized carbon material, wherein the graphitized carbon material comprises at least one of conductive graphite and graphene.

7 . The anode material of claim 1 , wherein the anode material has a particle size distribution satisfying: D10≥1.0 μm, 3 μm≤D50≤10 μm, and D90≤25.0 μm.

8 . The anode material of claim 1 , wherein the anode material comprises at least one of the following features (1) to (3):
(1) the lithium silicate accounts for a mass content of 30% to 80% in the anode material; (2) the lithium silicate comprises at least one of Li 2 SiO 3 , Li 2 Si 2 O 5 , and Li 4 SiO 4 ; and (3) the anode material has a pH value of 9 to 12.

9 . The anode material of claim 1 , wherein the anode material is tested for specific capacity at a voltage of 0 to 1.5V, the specific capacity of the anode material is A at a cut-off voltage of 0.3V, the specific capacity of the anode material is B at a cut-off voltage of 0.4V, and the specific capacity of the anode material is C at a cut-off voltage of 0.5V, which satisfy the following relational expression: 0.7≤(C−B)/(B−A)≤1.3.

10 . A preparation method of an anode material, wherein the preparation method comprising:
impregnating a silicon-based raw material into a phosphoric acid solution for surface modification, and performing solid-liquid separation to obtain a precursor; and heating a mixture comprising the precursor, a lithium source, a magnesium source, and an aluminum source to obtain the anode material, wherein the anode material comprises a silicon-based active material and a lithium silicate, and the anode material further comprises a Mg element, an Al element, and a P element, wherein the Mg element accounts for a mass content of a % in the anode material, the Al element accounts for a mass content of b % in the anode material, the P element accounts for a mass content of c % in the anode material, and in the anode material, a, b and c satisfy the following relational expressions: 0.33≤(a+b)/c≤1.5, and 0.5≤a+b+c≤10.

11 . The preparation method of claim 10 , wherein the preparation method satisfies at least one of the following features:
(1) the phosphoric acid solution has a concentration of 0.05 mol/L to 5 mol/L; (2) the impregnating has a duration of 2 h to 10 h; and (3) the solid-liquid separation comprises at least one of filtration and centrifugation.

12 . The preparation method of claim 10 , wherein the preparation method satisfies one of the following features:
(1) the lithium source comprises at least one of Li 2 O, Li 2 CO 3 , LiOH, Li, LiH, LiAlH 4 , and LiBH 4 ; (2) the magnesium source comprises at least one of Mg 2 O, Mg, Mg(OH) 2 , and MgCl 2 ; (3) the aluminum source comprises at least one of Al 2 O 3 , Al, Al(OH) 3 , and AlCl 3 ; and (4) the heating has a temperature of 400° C. to 900° C.

13 . The preparation method of claim 1

Assignees

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

Inventors

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

Classifications

• H01M2004/021

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

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/366

  as layered products · CPC title