Solvent systems for use in lithium ion battery production

Patent metadata

Field	Value
Publication number	US-11349115-B2
Application number	US-201817050101-A
Country	US
Kind code	B2
Filing date	Apr 27, 2018
Priority date	Apr 27, 2018
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

In the process of producing a lithium ion battery, one or more compounds of Formula 1, 2, 3 or 4 (e.g., N,N-dimethylpropionamide), is used as the solvent in the step of forming a slurry from an active material (e.g., lithium cobalt oxide), a conductive agent (e.g., carbon black), and a binder polymer (e.g., polyvinylidene fluoride).

First claim

What is claimed is:

1. A process of making a lithium ion battery cathode or anode, the process comprising the steps of:
forming a slurry consisting of an active material, a conductive agent, a binder polymer that is polyvinylidene fluoride, and a solvent, the solvent consisting of one or more of a first compound of Formula 1

in which R 1 and R 2 are hydrogen or a C1-4 straight or branched chain alkyl or alkoxy, and R 3 is a C1-10 straight or branched chain alkyl or alkoxy, with the proviso that R 1 and R 2 are not both hydrogen; or
one or more of a second compound of Formula 2

in which R 2 ′ is 2-9 ring carbon atoms each of which can have a C1-2 alkyl or alkoxy branch, and R 1 ′ is a C2-8 straight or branched chain alkyl or alkoxy; or

one or more of a third compound of Formula 3

in which R 1 ″ and R 2 ″ are hydrogen or a C1-2 alkyl or alkoxy; R 3 ″ is 2-4 ring carbons each of which can have a C1-2 alkyl or alkoxy branch; and R 4 ″ is hydrogen or a C1-3 straight or branched chain alkyl or alkoxy, or

one or more of a fourth compound of Formula 4

in which R 1 ″ is 5-9 ring carbons each of which can have a C1-2 alkyl or alkoxy branch; and R 2 ′″ is hydrogen or a C1-3 straight or branched chain alkyl or alkoxy; and applying the slurry to a foil.

2. The process of claim 1 in which the solvent consists of a compound of Formula 1.

3. The process of claim 2 in which the solvent is N,N-dimethylpropionamide.

4. The process of claim 1 in which the solvent consists of a compound of Formula 2.

5. The process of claim 4 in which the solvent is N,N-diethyl acetamide.

6. The process of claim 1 in which the solvent consists of a compound of Formula 3.

7. The process of claim 6 in which the solvent is 3-methoxy-N,N-dimethyl propionamide.

8. The process of claim 1 in which the solvent consists of a compound of Formula 4.

9. The process of claim 8 in which the solvent is N,N-dimethylbutyramide.

10. A cathode or anode comprising the foil made by the process of claim 1 .

11. A lithium ion battery comprising the cathode or anode of claim 10 .

12. The process of claim 1 wherein the solvent is selected from the group consisting of N,N-diethyl acetamide, 3-methoxy-N,N-dimethyl propionamide, and N, N-dimethylpropionamide.

13. A process of making a lithium ion battery cathode or anode, the process comprising:
forming a slurry consisting of (i) an active material, (ii) a conductive agent, (iii) a binder polymer selected from the group consisting of polyvinylidene fluoride, cellulose, and styrene butadiene rubber, and (iv) a solvent, the solvent selected from the group consisting of
N,N-dimethylpropionamide (DMPA), N,N-diethylpropionamide, N,N-dipropylpropionamide, N,N-dibutylpropionamide, N,N-dimethylethylpropionamide, 3-butoxy-N-methyl propionamide,
N,N-diethyl acetamide (DEAC), N-ethyl-ε-caprolactam,
3-methoxy-N,N-dimethyl propionamide (M3DMPA), N-acetyl morpholine,
N,N-dimethylbutyramide (DMAA), N-propionyl-ε-caprolactam, and combinations thereof; and applying the slurry to a foil.

14. The process of claim 13 wherein the binder polymer is polyvinylidene fluoride.

15. The process of claim 14 wherein the solvent is selected from the group consisting of N,N-diethyl acetamide, 3-methoxy-N,N-dimethyl propionamide (M3DMPA), N,N-dimethylpropionamide (DMPA), and combinations thereof.

16. The process of claim 15 wherein the solvent is N,N-diethyl acetamide.

17. The process of claim 15 wherein the solvent is 3-methoxy-N,N-dimethyl propionamide.

18. The process of claim 15 wherein the solvent is N, N-dimethylpropionamide.

Assignees

• Dow Global Technologies Llc
• Dow Chemical Korea Ltd

Inventors

• Jiang Xin
• Jiang Qi
• Ren Hua
• Mu Jianhai
• Kim Eungkyu
• Ohba Kaoru
• Kim Jong-Cheol

Classifications

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

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

• H01M4/625

  Carbon or graphite · CPC title