In-situ polymerized polymer electrolyte for lithium ion batteries

Patent metadata

Field	Value
Publication number	US-2022344712-A1
Application number	US-201917616932-A
Country	US
Kind code	A1
Filing date	Jun 6, 2019
Priority date	Jun 6, 2019
Publication date	Oct 27, 2022
Grant date	—

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

1 . 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, which is an unsaturated carbonated ester monomer, preferably a monomer represented by formula (I), more preferably vinylene carbonate;

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

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, preferably a+b+c≥3;
preferably the mass ratio of the first monomer and the second monomer is 20:0.5-20:10, for example 20:2-20:5, most preferably 20:3-20:5.

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 comprises, consists essentially of, or 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 comprises, consists essentially of, or 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; and D) optionally an organic solvent, preferably ethylene carbonate/dimethyl carbonate, with an amount of 0%-70 wt. %, preferably 10%-60 wt. %, more preferably 20%-50 wt. % based on the total weight of the polymer electrolyte precursor composition.

4 . The polymer electrolyte precursor composition of claim 3 , wherein the amount of the monomers is 5-80 wt. %, preferably 25-75 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 or is prepared according to the method of claim 5 .

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 any one of claims 6 - 8 .

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 any one of claims 6 - 8 .

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, comprising, consisting essentially of, or 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 . Use of the monomers of claim 1 , or the polymer electrolyte precursor raw material composition of claim 2 , or the polymer electrolyte precursor composition of claim 3 , in preparation of an in-situ polymerized polymer electrolyte or an electrochemical device.

Assignees

• Evonik Operations Gmbh

Inventors

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

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• C08L33/08

  Homopolymers or copolymers of acrylic acid esters · CPC title