In-situ polymerized polymer electrolyte for lithium ion batteries

Patent metadata

Field	Value
Publication number	US-12412927-B2
Application number	US-201917616932-A
Country	US
Kind code	B2
Filing date	Jun 6, 2019
Priority date	Jun 6, 2019
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

Monomers for preparing a polymer electrolyte precursor composition capable to form an in-situ polymerized polymer electrolyte, which comprise, consist essentially of, or consist of A1) a first monomer and A2) a second monomer. A polymer electrolyte precursor raw material composition, a polymer electrolyte precursor composition capable to form a polymer electrolyte comprising the monomers, a polymer electrolyte and an electrochemical device are also provided.

First claim

The invention claimed is:

1. Monomers for preparing a polymer electrolyte precursor composition capable to form an in-situ polymerized polymer electrolyte, which consists of:
A1) a first monomer represented by formula (I);

wherein R represents H, F, methyl or ethyl; and
A2) a second monomer, represented by formula (II);

wherein R represents methyl, —CH 2 OH, ethyl, or —CH 2 CH 2 OH; a, b, c each independently represents 0, 1, 2 or 3, and a+b+c≥2;
wherein the mass ratio of the first monomer and the second monomer is 20:0.5-20:10.

2. A polymer electrolyte precursor raw material composition for preparing a polymer electrolyte precursor composition capable to form an in-situ polymerized polymer electrolyte, which consists of:
A) monomers of claim 1 ; and
B) a free radical initiator for thermal polymerization reaction of the monomers.

3. A polymer electrolyte precursor composition capable to form an in-situ polymerized polymer electrolyte, which consists of:
A) monomers of claim 1 ;
B) a free radical initiator for thermal polymerization reaction of the monomers; and
C) a lithium salt, preferably lithium bis(trifluoromethanesulfonyl) imide.

4. The polymer electrolyte precursor composition of claim 3 , wherein the amount of the monomers is 5-80 wt. % based on the total weight of the polymer electrolyte precursor composition.

5. A method to in-situ prepare a polymer electrolyte, comprising the steps as follows:
1) injecting the polymer electrolyte precursor composition of claim 3 into a battery case with an electrode assembly, followed by sealing; and
2) Polymerizing in-situ the polymer electrolyte precursor composition by heating.

6. A polymer electrolyte, wherein the polymer electrolyte is formed by a polymer electrolyte precursor composition of claim 3 .

7. A polymer electrolyte for rechargeable batteries, comprising a polymer which is the reaction product of the monomers of claim 1 with a free radical initiator.

8. A polymer electrolyte for rechargeable batteries, comprising:
(i) a polymer which is the reaction product of the monomers of claim 1 with a free radical initiator, and
(ii) an organic solvent which contains an amount of an ionic salt effective to achieve an ionic conductivity of about 0.44 mS/cm or less.

9. A rechargeable battery comprising an anode, a cathode, a microporous separator separating said anode and said cathode, and a gel polymer electrolyte according to claim 6 .

10. A lithium ion battery comprising the polymer electrolyte prepared in-situ by the polymer electrolyte precursor composition of claim 3 .

11. An electrochemical device comprising the polymer electrolyte according to claim 6 .

12. A device fabricated by a process comprising:
preparing an installed battery case with an electrode assembly;
injecting the polymer electrolyte precursor composition of claim 3 into the battery case, followed by sealing; and
polymerizing the polymer electrolyte precursor composition.

13. A polymer electrolyte precursor composition capable to form a polymer electrolyte, consisting of:
A) monomers consisting of vinylene carbonate and trimethylolpropane ethoxylate triacrylate;
B) a free radical initiator, with an amount of 0.1-3 wt. % based on the total weight of the vinylene carbonate and trimethylolpropane ethoxylate triacrylate;
C) lithium bis(trifluoromethanesulfonyl) imide; and
D) ethylene carbonate/dimethyl carbonate;

wherein the amount of the vinylene carbonate and trimethylolpropane ethoxylate triacrylate is 25-75 wt. % based on the total weight of the polymer electrolyte precursor composition; and the mass ratio of vinylene carbonate and trimethylolpropane ethoxylate triacrylate is around 20:2-20:5.

14. Monomers for preparing a polymer electrolyte precursor composition capable to form an in-situ polymerized polymer electrolyte of claim 1 , wherein the first monomer is vinylene carbonate.

15. Monomers for preparing a polymer electrolyte precursor composition capable to form an in-situ polymerized polymer electrolyte of claim 1 , wherein the second monomer is trimethylolpropane ethoxylate triacrylate.

16. Monomers for preparing a polymer electrolyte precursor composition capable to form an in-situ polymerized polymer electrolyte of claim 1 , wherein a+b+c≥3.

17. Monomers for preparing a polymer electrolyte precursor composition capable to form an in-situ polymerized polymer electrolyte of claim 1 , wherein the mass ratio of the first monomer and the second monomer is 20:3-20:5.

18. The polymer electrolyte of claim 3 , wherein the lithium salt is bis(trifluoromethanesulfonyl) imide.

19. The polymer electrolyte of claim 3 , further comprising an organic solvent with an amount of 0%-70 wt. % based on the total weight of the polymer electrolyte precursor composition.

20. The polymer electrolyte of claim 19 , wherein the organic solvent is ethylene carbonate/dimethyl carbonate.

21. The polymer electrolyte of claim 19 , wherein the amount of the organic solvent is 20%-50 wt. % based on the total weight of the polymer electrolyte precursor composition.

Assignees

• Evonik Operations Gmbh

Inventors

• Su Shasha
• Jiang Jinhua
• Feng Jing
• Li Hongping
• Lu Huichao
• Xu Zhixin
• Yang Jun

Classifications

• H01M2300/0085

  Immobilising or gelification of electrolyte · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M10/0525

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

• C08L37/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a heterocyclic ring containing oxygen (of cyclic esters of polyfunctional acids C08L31/00; of cyclic anhydrides of unsaturated acids C08L35/00); Compositions of derivatives of such polymers · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title