Electrolyte composition, electrolyte film, and method of manufacturing electrolyte film

Patent metadata

Field	Value
Publication number	US-12027666-B2
Application number	US-201917264839-A
Country	US
Kind code	B2
Filing date	Jul 5, 2019
Priority date	Jul 31, 2018
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

The present invention aims to provide an electrolyte composition from which an electrolyte film having a higher battery performance than typical electrolyte films is obtained. The present invention provides an electrolyte composition containing an alkali metal salt. The composition further contains a photocurable and/or thermosetting monomer; and a salt dissociating agent. A content ratio of the alkali metal salt is 50% by mass or more relative to 100% by mass of the total amount of the alkali metal salt, the photocurable and/or thermosetting monomer, and the salt dissociating agent.

First claim

The invention claimed is:

1. An electrolyte composition containing an alkali metal salt, the composition further comprising:
a photocurable and/or thermosetting monomer; and
a salt dissociating agent,
(A) a content ratio of the alkali metal salt being 50% by mass to 88% by mass relative to 100% by mass of a total amount of the alkali metal salt, the photocurable and/or thermosetting monomer, and the salt dissociating agent;
(B) a content of the photocurable and/or thermosetting monomer being 10% by mass to 45% by mass relative to 100% by mass of the total amount of the alkali metal salt, the photocurable and/or thermosetting monomer, and the salt dissociating agent; and
(C) a content of the salt dissociating agent being 0.5% by mass to 30% by mass relative to 100% by mass of the total amount of the alkali metal salt, the photocurable and/or thermosetting monomer, and the salt dissociating agent.

2. The electrolyte composition of claim 1 , wherein
the alkali metal salt is represented by the following formula (1):
MN(SO 2 R 1 )(SO 2 R 2 )  (1)

(where M represents the alkali metal ion, and R 1 and R 2 are identical to or different from each other and each represent a fluorine atom or a fluoroalkyl group with a carbon number of 1 to 3).

3. The electrolyte composition of claim 1 , wherein
the alkali metal salt is an alkali metal salt of bis(fluorosulfonyl)imide.

4. The electrolyte composition of claim 1 , wherein
the photocurable and/or thermosetting monomer has a hetero element.

5. The electrolyte composition of claim 1 , wherein
the photocurable and/or thermosetting monomer contains a polyfunctional monomer.

6. The electrolyte composition of claim 1 , wherein
the salt dissociating agent is a carbonate compound.

7. The electrolyte composition of claim 1 , wherein
the salt dissociating agent is a sulfonyl compound.

8. The electrolyte composition of claim 1 , wherein
the salt dissociating agent is a nitrile compound.

9. The electrolyte composition of claim 1 , further comprising:
a polymerization initiator.

10. An electrolyte film obtained by curing the electrolyte composition of claim 1 , the electrolyte film comprising:
an alkali metal salt;
a polymer having a structural unit derived from a photocurable and/or thermosetting monomer; and
a salt dissociating agent.

11. The electrolyte film of claim 10 , further comprising:
an organic solvent with a lower boiling point than the salt dissociating agent,
a content of the organic solvent being 20% by mass or less relative to 100% by mass of a total amount of the alkali metal salt, the polymer having the structural unit derived from the photocurable and/or thermosetting monomer, and the salt dissociating agent.

12. A method of manufacturing an electrolyte film, comprising:
a step of curing the electrolyte composition of claim 1 , wherein
an amount of the organic solvent with a lower boiling point than the salt dissociating agent used in the step of curing is 20% by mass or less relative to 100% by mass of the total amount of the alkali metal salt, the photocurable and/or thermosetting monomer, and the salt dissociating agent in the composition.

13. The electrolyte composition of claim 1 , further comprising:
(D) the photocurable and/or thermosetting monomer contains a monomer having a structural unit derived from alkylene oxide.

14. The electrolyte composition of claim 1 , further comprising:
(E) the content of the monomer having a structural unit derived from alkylene oxide being 30% by mass to 100% by mass relative to 100% by mass of the total amount of the photocurable and/or thermosetting monomer.

Assignees

• Nippon Catalytic Chem Ind

Inventors

• SHIBATA Shin-ya

Classifications

• H01M2300/0082

  Organic polymers · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01B1/122

  Ionic conductors · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · CPC title

• Y02E60/50

  Fuel cells · CPC title