Anode active material for lithium secondary battery and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2025206614-A1
Application number	US-202418988888-A
Country	US
Kind code	A1
Filing date	Dec 20, 2024
Priority date	Dec 20, 2023
Publication date	Jun 26, 2025
Grant date	—

Abstract

An anode active material for a lithium secondary battery according to the present disclosure includes a porous carbon-based particle including pores. The anode active material for a lithium secondary battery includes a composite coating which is formed on a surface of the porous carbon-based particle, and includes a silicon element and at least one additional element from the group consisting of group 13 elements and group 15 elements. A weight ratio of the additional element to a weight of the silicon element included in the composite coating is 0.01% to 4%. The electrical characteristics and lifespan characteristics of the lithium secondary battery may be improved by including the additional element in a predetermined range of contents.

First claim

What is claimed is:

1 . An anode active material for a lithium secondary battery comprising:
a porous carbon-based particle including pores; and a composite coating which is formed on a surface of the porous carbon-based particle, and comprises a silicon element and at least one additional element from the group consisting of group 13 elements and group 15 elements, wherein a weight ratio of the additional element to a weight of the silicon element included in the composite coating is 0.01% to 4%.

2 . The anode active material for a lithium secondary battery according to claim 1 , wherein a weight ratio of the silicon element to a total weight of the anode active material is 30% to 70%.

3 . The anode active material for a lithium secondary battery according to claim 1 , wherein the composite coating comprises the group 13 element, and a weight ratio of the group 13 element to the weight of the silicon element is 0.01% to 2.5% by weight.

4 . The anode active material for a lithium secondary battery according to claim 1 , wherein the composite coating comprises the group 15 element, and a weight ratio of the group 15 element to the weight of the silicon element is 0.01 wt % to 4.0 wt %.

5 . The anode active material for a lithium secondary battery according to claim 1 , wherein the group 13 element comprises at least one selected from the group consisting of B, Al, Ga, In and Tl, and the group 15 element comprises at least one selected from the group consisting of N, P, As, Sb and Bi.

6 . The anode active material for a lithium secondary battery according to claim 1 , wherein the porous carbon-based particle has a specific surface area of 1,000 m 2 /g to 2,000 m 2 /g.

7 . The anode active material for a lithium secondary battery according to claim 1 , wherein the pores included in the porous carbon-based particles have an average pore diameter of 1 nm to 20 nm.

8 . The anode active material for a lithium secondary battery according to claim 1 , wherein the composite coating is formed inside the pores included in the porous carbon-based particles and on an outer surface of the porous carbon-based particles.

9 . The anode active material for a lithium secondary battery according to claim 1 , wherein the composite coating comprises at least one of the group 13 elements and at least one of the group 15 elements.

10 . The anode active material for a lithium secondary battery according to claim 1 , wherein the additional element is included as a dopant of the composite coating.

11 . An anode for a lithium secondary battery, comprising:
an anode current collector; and an anode active material layer disposed on at least one surface of the anode current collector and comprising the anode active material for a lithium secondary battery according to claim 1 .

12 . A lithium secondary battery, comprising:
the anode for a lithium secondary battery according to claim 11 ; and a cathode disposed to face the anode.

13 . A method for manufacturing an anode active material for a lithium secondary battery, the method comprising:
preparing porous carbon-based particles including pores; and vapor-depositing a silicon source and at least one additional element source from the group consisting of group 13 elements and group 15 elements on the porous carbon-based particles to form a composite coating, wherein a ratio of an injection volume of the additional element source to an injection volume of the silicon source is 0.1% to 2%.

14 . The method according to claim 13 , wherein the additional element source comprises the group 13 element, and a volume ratio of the additional element source to the silicon source is 0.1% to 1%.

15 . The method according to claim 13 , wherein the additional element source comprises the group 15 element, and a volume ratio of the additional element source to the silicon source is 0.1% to 2%.

Assignees

• Sk On Co Ltd

Inventors

• Moon Joon Hyung
• Chung Ju Ho
• Park Gwi Ok

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

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

• H01M10/052

  Li-accumulators · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title