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