Copolymer binder

Patent metadata

Field	Value
Publication number	US-11652209-B2
Application number	US-202117167478-A
Country	US
Kind code	B2
Filing date	Feb 4, 2021
Priority date	Apr 22, 2016
Publication date	May 16, 2023
Grant date	May 16, 2023

Abstract

A copolymer including a monomer A with a molar ratio a varying between around 0.01 and around 0.20, a monomer B with a molar ratio b varying between around 0.2 and around 0.4, and a monomer C with a molar ratio c varying between around 0.50 and around 0.70, the monomer A being a hydrophilic monomer including a pendant chain of poly(ethylene oxide) (POE) with low molar weight, the monomer B being a hydrophobic monomer with a glass transition temperature (Tg) of around −30° C. or less, the monomer C being a monomer that is more hydrophobic than the monomer Band having a glass transition temperature (Tg) of around 80° C. or more, said monomers being organised in a hydrophilic segment, a hydrophobic segment and an intermediate segment located between the hydrophilic segment and the hydrophobic segment.

First claim

The invention claimed is:

1. A copolymer comprising:
a monomer A with a molar ratio a varying between around 0.01 and around 0.20,
a monomer B with a molar ratio b varying between around 0.15 and around 0.4,
a monomer C with a molar ratio c varying between around 0.50 and around 0.70, and
a monomer D with a molar ratio d varying between around 0.01 and around 0.10,

the monomer A being a hydrophilic monomer comprising a pendant chain of poly(ethylene oxide) (POE) with a low molar weight,
the monomer B being a hydrophobic monomer with a glass transition temperature (Tg) of around −30° C. or less,
the monomer C being more hydrophobic than the monomer B and having a glass transition temperature (Tg) of around 80° C. or more,
the monomer D being a monomer chemically cross-linkable in water,
said monomers being organized in:
a hydrophilic segment,
a hydrophobic segment, and
an intermediate segment located between the hydrophilic segment and the hydrophobic segment,

the intermediate segment having a hydrophilicity midway between the hydrophilicity of the hydrophilic segment and the hydrophilicity of the hydrophobic segment,
the hydrophilic segment comprising the monomer A and part of the monomer B, and the intermediate segment and the hydrophobic segment comprising the rest of the monomer B as well as the monomer C, the intermediate segment being enriched with the monomer B relative to the hydrophobic segment and the hydrophobic segment being enriched with the monomer C relative to the intermediate segment.

2. The copolymer according to claim 1 , wherein the copolymer is manufactured by a polymerization reaction in an emulsion in water, wherein the polymerization reaction involves using a water-soluble radicular polymerization initiator.

3. The copolymer according to claim 2 , wherein the water-soluble radicular polymerization initiator is potassium persulfate.

4. The copolymer according to claim 2 , wherein the polymerization reaction further involves using a nonionic surfactant to stabilize the emulsion.

5. The copolymer according to claim 1 , wherein the copolymer has the following formula:

wherein:
A, B, C and D respectively representing monomers A, B, C and D and
a, b, c and d respectively representing molar ratios a, b, c and d.

6. The copolymer according to claim 1 , wherein the molar mass of the POE pendant chain varies between around 300 and around 2000 g/mol.

7. The copolymer according to claim 1 , wherein the monomer A is polyethylene glycol methyl acrylate or polyethylene glycol methyl methacrylate.

8. The copolymer according to claim 7 , wherein the monomer A has the formula:

wherein R is a hydrogen atom or a methyl group and x represents a number of POE repetition units such that the molar mass of the POE chain varies between around 300 and around 2000 g/mol.

9. The copolymer electrode in claim 1 , wherein the glass transition temperature (Tg) of the monomer B varies between around −30° C. and about −60° C.

10. The copolymer according to claim 1 , wherein the monomer B is:
n-butyl acrylate;
another acrylate or methacrylate having a Tg of around −30° C. or less;
butyl vinyl ether, or
a mixture thereof.

11. The copolymer according to claim 1 , wherein the monomer C is styrene or a derivative thereof, acrylonitrile, 2-vinyl-4,5-dicyanoimidazole, methyl methacrylate, tert-butyl methacrylate, morpholine acryloyl, phenyl methacrylate, ferrocene vinyl, ferrocene metal that acrylate or a mixture thereof.

12. The copolymer according to claim 1 , comprising acrylamide diketone as monomer D.

13. The copolymer according to claim 1 , wherein the copolymer further comprises acrylamide diketone as monomer D, and the copolymer has the following formula:

wherein
R is a hydrogen atom or a methyl group,
x represents a number of POE repetition units such that the molar mass of the POE chain varies between around 300 and around 2000 g/mol, and
d is a molar ratio varying between around 0 and around 0.10.

14. The copolymer according to claim 1 , wherein the molar mass (Mn) of the copolymer is between around 100,000 g/mol and around 300,000 g/mol.

15. The copolymer according to claim 1 , wherein the monomer A is polyethylene glycol methyl acrylate or polyethylene glycol methyl methacrylate.

16. The copolymer according to claim 1 , wherein the monomer B is n-butyl acrylate or butyl vinyl ether.

17. The copolymer according to claim 1 , wherein the monomer C is styrene or acrylonitrile.

18. The copolymer according to claim 1 , wherein the glass transition temperature (Tg) of the copolymer is between around 0° C. and around 20° C.

Assignees

• Hydro Quebec

Inventors

• Daigle Jean-Christophe
• Zaghib Karim

Classifications

• H01M4/622 Primary

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• H01M10/0525

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• C08F293/005

  using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent · CPC title

• Y02E60/10

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• H01M4/13

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title