Method of manufacturing anode for lithium secondary battery including pre-litigation

Patent metadata

Field	Value
Publication number	US-12542269-B2
Application number	US-202217992250-A
Country	US
Kind code	B2
Filing date	Nov 22, 2022
Priority date	Feb 28, 2022
Publication date	Feb 3, 2026
Grant date	Feb 3, 2026

Abstract

Proposed is a method of manufacturing an anode for a lithium secondary battery, including a pre-lithiation step.

First claim

What is claimed is:

1 . A method of manufacturing an anode for a lithium secondary battery, the method comprising:
preparing an anode comprising an anode current collector, and a coating layer disposed on the anode current collector and comprising a carbon material; doping lithium into the anode by simply immersing the anode in a pre-lithiation solution; and immersing the anode in a stabilizing solution, wherein the pre-lithiation solution comprises a pre-lithiated compound comprising lithium and a biphenyl-based compound, wherein the stabilizing solution comprises at least one of fluoroethylene carbonate (FEC), vinylene carbonate (VC), vinyl ethylene carbonate (VEC), methyl vinylene carbonate (meVC), ethylene carbonate (EC), or any combination thereof, and wherein a lithium doping amount of the anode is about 1 mAh/cm 2 or less.

2 . The method of claim 1 , wherein the coating layer comprises the carbon material and a metal capable of alloying with the lithium.

3 . The method of claim 2 , wherein the metal capable of alloying with the lithium comprises at least one of silver (Ag), magnesium (Mg), aluminum (Al), gallium (Ga), zinc (Zn), bismuth (Bi), tin (Sn), indium (In), antimony (Sb), lead (Pb), silicon (Si), germanium (Ge), or any combination thereof.

4 . The method of claim 1 , wherein a concentration of the pre-lithiation compound is about 0.1 M to 1 M.

5 . The method of claim 1 , wherein a molar ratio of the lithium and the biphenyl-based compound is about 0.5:1 to 6:1.

6 . The method of claim 1 , wherein the biphenyl-based compound is represented by the following Formula 1,

wherein, in Formula 1, R1 to R10 each comprises an alkyl group having 1 to 3 of carbon atoms.

7 . The method of claim 1 ,
wherein the pre-lithiation solution further comprises a solvent, and wherein the solvent comprises at least one of dimethyl ether (DME), 2-methyl tetrahydrofuran, tetrahydropyranyl, or any combination thereof.

8 . The method of claim 1 , wherein the anode is immersed in the pre-lithiation solution at a temperature of about 25° C. to 60° C. for about 10 seconds to 30 minutes.

9 . The method of claim 1 , wherein the anode is immersed in the stabilizing solution to form a film on the anode, and the film comprises a C—O bond, a C═O bond, and an R—CO—R′ bond.

10 . The method of claim 9 , wherein a thickness of the film is about 200 nm or less.

11 . The method of claim 1 , wherein the anode is immersed in the stabilizing solution for about 10 to 60 minutes.

12 . An anode manufactured by the method according to claim 1 for a lithium secondary battery, the anode comprising:
an anode current collector; and
a coating layer disposed on the anode current collector.

13 . The anode of claim 12 , wherein the coating layer comprises a carbon material and a metal capable of alloying with lithium.

14 . The anode of claim 13 , wherein the metal capable of alloying with the lithium comprises at least one of silver (Ag), magnesium (Mg), aluminum (Al), gallium (Ga), zinc (Zn), bismuth (Bi), tin (Sn), indium (In), antimony (Sb), lead (Pb), silicon (Si), germanium (Ge), or any combination thereof.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Korea Inst Sci & Tech

Inventors

• Nam Young Jin
• Oh Dae Yang
• Byun Soon Chul
• Lim Jae Min
• Choi Hong Suk
• Lee Min Ah
• Hong Ji Hyun
• Kang In Yeong
• Jang Ju Young

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

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

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M4/1395

  of electrodes based on metals, Si or alloys · CPC title