Anode active material, method for preparing anode active material, anode composition, lithium secondary battery anode comprising same, and lithium secondary battery comprising anode

Patent metadata

Field	Value
Publication number	US-2025149569-A1
Application number	US-202318838577-A
Country	US
Kind code	A1
Filing date	Aug 2, 2023
Priority date	Aug 4, 2022
Publication date	May 8, 2025
Grant date	—

Abstract

A negative electrode active material, a method for manufacturing the same, a negative electrode composition and a negative electrode including the same, and a lithium secondary battery including the negative electrode are provided.

First claim

1 . A negative electrode active material comprising a silicon-based active material having a specific surface area of 0.30 m 2 /g or greater and 4.00 m 2 /g or less,
wherein the silicon-based active material comprises Si and optionally SiOx (0<x<2), and includes 70 parts by weight or more of Si on the basis of 100 parts by weight of the silicon-based active material.

2 . The negative electrode active material of claim 1 , wherein Si has a crystal grain size of 200 nm or less.

3 . The negative electrode active material of claim 1 , wherein the silicon-based active material satisfies of Equation 1 below:

X
⁢
1
/
Y
⁢
1

≤
0.96

[

Equation
⁢

1

]

in Equation 1,
X1 refers to an area of orthographic projection of the silicon-based active material, and
Y1 refers to an area of a circle with the same circumference as the orthographic projection of the silicon-based active material.

4 . The negative electrode active material of claim 1 , wherein the silicon-based active material satisfies of Equation 2 below:

X
⁢
2
/
Y
⁢
2

≤
0.996

[

Equation
⁢

2

]

in Equation 2,
Y2 refers to a circumference of orthographic projection of the silicon-based active material, and
X2 refers to a circumference of a polygon circumscribed to orthographic projection of the silicon-based active material.

5 . The negative electrode active material of claim 1 , wherein a D50 particle size of the silicon-based active material is 3 μm or greater and 10 μm or less.

6 . A method for manufacturing a negative electrode active material, the method comprising:
depositing a silicon-based active material on a substrate by chemically reacting a silane gas; growing the silicon-based active material through crystal nucleation; and obtaining the silicon-based active material deposited on the substrate and grown through crystal nucleation, wherein the silicon-based active material has a specific surface area of 0.30 m 2 /g or greater and 4.00 m 2 /g or less.

7 . The method of claim 6 , wherein the silane gas comprises one or more gases selected from monosilane, dichlorosilane, and trichlorosilane.

8 . The method of claim 6 , wherein the growing of the silicon-based active material through crystal nucleation is performed under conditions of a temperature of 800° C. to 1300° C. and a pressure of 100 Pa to 150 Pa.

9 . A negative electrode composition comprising:
the negative electrode active material of claim 1 ; a negative electrode conductive material; and a negative electrode binder.

10 . The negative electrode composition of claim 9 , wherein the negative electrode active material is included in an amount of 40 parts by weight or more on the basis of 100 parts by weight of the negative electrode composition.

11 . The negative electrode composition of claim 9 , wherein the negative electrode conductive material is included in an amount of 20 parts by weight or less on the basis of 100 parts by weight of the negative electrode composition.

12 . A negative electrode for a lithium secondary battery comprising:
a negative electrode current collector layer; and a negative electrode active material layer provided on one surface or both surfaces of the negative electrode current collector layer, wherein the negative electrode active material layer comprises the negative electrode composition of claim 9 or a cured product thereof.

13 . The negative electrode for a lithium secondary battery of claim 12 , wherein a thickness of the negative electrode current collector layer is 1 μm or greater and 100 μm or less, and
wherein a thickness of the negative electrode active material layer is 5 μm or greater and 500 μm or less.

14 . A lithium secondary battery comprising:
a positive electrode; the negative electrode of claim 12 ; a separator between the positive electrode and the negative electrode; and an electrolyte.

Assignees

• Lg Energy Solution Ltd

Inventors

• Kim Dohyeun
• Kim Donghyuk
• Lee Yong Ju
• Jun Hyunmin

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

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

• H01M10/052

  Li-accumulators · CPC title

• C01P2006/40

  Electric properties · CPC title

• C01P2006/12

  Surface area · CPC title