Electrolyte and lithium ion secondary battery
An electrolyte contains a non-aqueous solvent, a lithium salt, and a fluorine-containing ether compound represented by the following Formula (I). In the following formula, R 1 represents an alkyl group having 3 to 8 carbon atoms; R 2 represents an alkyl group having 1 carbon atom; at least 6 carbon atoms among carbon atoms bonded to the alkyl group represented by R 1 are substituted with fluorine atoms; and at least one hydrogen atom among hydrogen atoms bonded to the alkyl group represented by R 2 is substituted with a fluorine atom.
1. An electrolyte comprising:
a non-aqueous solvent;
a lithium salt; and
a fluorine-containing ether compound,
wherein the fluorine-containing ether compound is 2,2,3,3,4,4,5,5,5-nonafluoropentyl difluoromethyl ether.
2. The electrolyte according to claim 1 ,
wherein the content of the fluorine-containing ether compound is 1% by volume to 60% by volume with respect to the total amount of the electrolyte.
3. The electrolyte according to claim 1 ,
wherein the non-aqueous solvent is a solvent mixture of ethylene carbonate and diethylene carbonate.
4. The electrolyte according to claim 1 ,
wherein the non-aqueous solvent is a solvent mixture of fluorinated ethylene carbonate and diethylene carbonate.
5. The electrolyte according to claim 4 ,
wherein the content of the fluorinated ethylene carbonate is 30% by volume to 70% by volume with respect to the total amount of the non-aqueous solvent.
6. The electrolyte according to claim 1 , further comprising a boron-based compound represented by the following Formula (B-1),
wherein
R 3 represents an alkyl group having 1 to 4 carbon atoms or an alkenyl group having 2 to 4 carbon atoms, and
R 4 represents an alkyl group having 1 to 4 carbon atoms.
7. The electrolyte according to claim 6 ,
wherein the content of the boron-based compound is 0.01% by mass to 5% by mass with respect to the total amount of the electrolyte.
8. The electrolyte according to claim 6 ,
wherein the content of the boron-based compound is equal to or less than 5 parts by mass with respect to 100 parts by mass of the fluorine-containing ether compound.
9. A lithium ion secondary battery comprising the electrolyte according to claim 1 .