Prelithiation and method of manufacturing prelithiated anode using the same

Patent metadata

Field	Value
Publication number	US-11905302-B2
Application number	US-202017121347-A
Country	US
Kind code	B2
Filing date	Dec 14, 2020
Priority date	May 11, 2020
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

The present disclosure relates to a prelithiation solution and a method for preparing a prelithiated anode using the same. The prelithiation solution and the method for preparing a prelithiated anode using the same according to the present disclosure allow uniform intercalation of lithium ions throughout the anode chemically in a solution via a simple process of immersing the anode in a prelithiation solution having a sufficiently low redox potential as compared to an anode active material. A prelithiated anode prepared by this method has an ideal initial coulombic efficiency and a lithium secondary battery with a high energy density can be prepared based thereon. In addition, the prepared anode is advantageously applicable to large-scale production due to superior stability even in dry air.

First claim

What is claimed is:

1. A prelithiation solution comprising a lithium organic complex of an aromatic hydrocarbon derivative, of which at least one benzene ring has a non-hydrogen substitute,
wherein the aromatic hydrocarbon derivative is one or more selected from a group consisting of compounds represented by any of Chemical Formula 1 and Chemical Formula 2:

wherein
in Chemical Formula 1,
each of R 1 and R 2 , which are identical to or different from each other, is C 1 -C 4 alkyl,
each of a and b is independently an integer from 0 to 2, wherein at least one is not 0,
if a is 2 or greater, two or more R 1 's are identical to or different from each other, and
if b is 2 or greater, two or more R 2 's are identical to or different from each other, and
in Chemical Formula 2,

each of R 3 and R 4 , which are identical to or different from each other, is C 1 -C 4 alkyl,
each of c and d is independently an integer from 0 to 2, wherein at least one is not 0,
if c is 2 or greater, two or more R 3 's are identical to or different from each other, and
if d is 2 or greater, two or more R 4 's are identical to or different from each other.

2. The prelithiation solution according to claim 1 , wherein the aromatic hydrocarbon derivative is one or more selected from a group consisting of compounds represented by any of Chemical Formulas 1-1 to 1-3 and 2-1 to 2-3:

3. The prelithiation solution according to claim 1 , wherein a solvent of the prelithiation solution is one or more selected from a group consisting of a cyclic ether and a linear ether.

4. The prelithiation solution according to claim 1 , wherein the concentration of the complex in the prelithiation solution is 0.01-5 M.

5. The prelithiation solution according to claim 1 , wherein the complex has a redox potential lower than 0.25 V versus Li/Li + .

6. A prelithiated anode including a prelithiation solution according to claim 1 .

7. A lithium secondary battery comprising:
(a) a prelithiated anode according to claim 6 ,
(b) a cathode, and
(c) an electrolyte.

8. A lithium-ion capacitor comprising:
(a) a prelithiated anode according to claim 6 ,
(b) a cathode, and
(c) an electrolyte.

9. A method for preparing a prelithiated anode, comprising:
(a) a step of preparing an anode comprising an anode active material layer formed on the surface of one or both sides of a current collector; and
(b) a step of preparing a prelithiated anode by immersing the anode in a prelithiation solution comprising a lithium organic complex of an aromatic hydrocarbon derivative, of which at least one benzene ring has a non-hydrogen substitute,
wherein the aromatic hydrocarbon derivative is one or more selected from a group consisting of compounds represented by any of Chemical Formula 1 and Chemical Formula 2:

wherein
in Chemical Formula 1, each of R 1 and R 2 , which are identical to or different from each other, is C 1 -C 4 alkyl,
each of a and b is independently an integer from 0 to 2, wherein at least one is not 0,
if a is 2 or greater, two or more R 1 's are identical to or different from each other, and
if b is 2 or greater, two or more R 2 's are identical to or different from each other, and
in Chemical Formula 2,

each of R 3 and R 4 , which are identical to or different from each other, is C 1 -C 4 alkyl,
each of c and d is independently an integer from 0 to 2, wherein at least one is not 0,
if c is 2 or greater, two or more R 3 's are identical to or different from each other, and
if d is 2 or greater, two or more R 4 's are identical to or different from each other.

10. The method for preparing a prelithiated anode according to claim 9 , wherein the anode active material is one or more selected from a group consisting of graphite, hard carbon, activated carbon, carbon nanotube, amorphous carbon, silicon, silicon oxide (SiO x ), silicide, silicon alloy, silicon carbide, silicon nitride, Ge, Sn, Sb, Al, Ag, Au and TiO 2 .

11. The method for preparing a prelithiated anode according to claim 9 , wherein the immersion of the step (b) is performed at a temperature of −10 to 80° C.

12. The method for preparing a prelithiated anode according to claim 9 , wherein the immersion of the step (b) is performed for 0.01-1440 minutes.

Assignees

• Korea Inst Sci & Tech

Inventors

• Lee Minah
• Hong Jihyun
• Chung Kyung Yoon
• Suh Jin-Yoo
• Kim Sang Ok
• Kim Hyungseok
• Kang Inyeong
• Jang Ju Young
• Choi Jin Kwan

Classifications

• C07F1/02 Primary

  Lithium compounds · CPC title

• H01M4/049

  Manufacturing of an active layer by chemical means · CPC title

• H01M4/366

  as layered products · CPC title

• H01M10/0525

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

• H01M2004/028

  Positive electrodes · CPC title