Nonaqueous electrolyte solution and electrochemical element using same
View Patent ↗The present invention provides a nonaqueous electrolytic solution which can improve the electrochemical characteristics in a broad temperature range, an electrochemical element produced by using the same and a sulfonic ester compound having a branched structure which is used for the same. The present invention relates to a nonaqueous electrolytic solution prepared by dissolving an electrolyte salt in a nonaqueous solvent, which comprises a sulfonic ester compound represented by the following Formula (I) in an amount of 0.001 to 5% by mass of the nonaqueous electrolytic solution: (wherein R represents an alkyl group or an aryl group; A represents a >CH group or a >SiZ group (Z represents an alkyl group or an aryl group); X represents an alkyl group, a cycloalkyl group or an aryl group; Y represents a cycloalkyl group, a -L 1 CHR a OSO 2 R b group or a —Si(R c )(R d )OSO 2 R b group; W represents 1 or 2; R a represents an alkyl group; R b , R c and R d represent an alkyl group or an aryl group; L 1 represents an alkylene group in which at least one hydrogen atom may be substituted with —OSO 2 R e (R e has the same meaning as that of R), a divalent linkage group containing at least one ether bond or a single bond).
1. A nonaqueous electrolytic solution, comprising:
a nonaqueous solvent having an electrolyte salt dissolved therein; and
a sulfonic ester compound of Formula (V):
where R 11 and R 12 are each independently an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms,
R 13 and R 14 are each independently an alkyl group having 1 to 6 carbon atoms,
L 1 is an alkylene group having 1 to 6 carbon atoms in which any hydrogen atom is optionally substituted with —OSO 2 R 15 , L 1 is a divalent linkage group having 2 to 6 carbon atoms and comprising an ether bond, or L 1 is a single bond,
R 15 is an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, and
any hydrogen atom on a carbon atom of an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms in the sulfonic ester compound is optionally substituted with a halogen atom,
wherein the sulfonic ester compound of Formula (V) is included in an amount of from 0.001 to 5% by mass of the nonaqueous electrolytic solution.
2. The nonaqueous electrolytic solution claim 1 , further comprising:
a sulfonic ester compound of Formula (VI):
where R 16 and R 17 are each independently an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms,
R 18 is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms,
L 2 is an alkylene group having 1 to 6 carbon atoms in which any hydrogen atom is optionally substituted with —OSO 2 R 19 , L 2 is a divalent linkage group having 2 to 6 carbon atoms and comprising an ether bond, or L 2 is a single bond, and
any hydrogen atom on a carbon atom of an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms in the sulfonic ester compound of Formula (VI) is optionally substituted with a halogen atom,
wherein the sulfonic ester compound of Formula (VI) is included in an amount of from 0.001 to 5% by mass of the nonaqueous electrolytic solution.
3. The nonaqueous electrolytic solution of claim 2 , wherein R 18 is a hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms.
4. The nonaqueous electrolytic solution of claim 2 , wherein the sulfonic ester compound of formula (VI) is selected from the group consisting of ethane-1,2-diyl dimethanesulfonate, propane-1,3-diyl dimethanesulfonate, pentane-1,5-diyl dimethanesulfonate, and propane-1,2-diyl dimethanesulfonate.
5. The nonaqueous electrolytic solution of claim 1 , further comprising:
from 0.001 to 5% by mass of at least one of
a benzene compound comprising a hydrocarbon group having 1 to 6 carbon atoms bonded to a benzene ring via a tertiary carbon atom or a quaternary carbon atom, and
an S═O group-comprising compound comprising a cyclic structure or an unsaturated group.
6. The nonaqueous electrolytic solution of claim 1 , wherein R 11 and R 12 are each independently a methyl group, an ethyl group, a phenyl group, or a 4-methylphenyl group.
7. The nonaqueous electrolytic solution of claim 1 , wherein L 1 is a methylene group, an ethylene group, or a single bond.
8. The nonaqueous electrolytic solution of claim 1 , wherein L 1 is a single bond.
9. The nonaqueous electrolytic solution of claim 1 , wherein the sulfonic ester compound of Formula (V) is included in an amount of from 0.01 to 3% by mass of the nonaqueous electrolytic solution.
10. The nonaqueous electrolytic solution of claim 1 , wherein the sulfonic ester compound of Formula (V) is at least one selected from the group consisting of butane-2,3-diyl dimethanesulfonate, butane-2,3-diyl bis(4-methylbenzenesulfonate), pentane-2,3-diyl dimethanesulfonate, pentane-2,3-diyl bis(4-methylbenzenesulfonate), hexane-2,3-diyl dimethanesulfonate, hexane-2,3-diyl bis(4-methylbenzenesulfonate), pentane-2,4-diyl dimethanesulfonate, and pentane-2,4-diyl bis(4-methylbenzenesulfonate).
11. The nonaqueous electrolytic solution of claim 1 , wherein the nonaqueous solvent is at least one selected from the group consisting of a cyclic carbonate, a linear ester, a lactone, an ether, an amide, a phosphoric ester, a sulfone, a nitrile, and a compound comprising a S═O bond.
12. The nonaqueous electrolytic solution of claim 1 , wherein the nonaqueous solvent comprises at least one of
a first cyclic carbonate comprising a carbon-carbon double bond in an amount of from 0.001 to 5% by volume based on a volume of the nonaqueous solvent, and
a second cyclic carbonate comprising a fluorine atom in an amount of from 0.01 to 35% by volume based on a volume of the nonaqueous solvent.
13. An electrochemical element, comprising:
a positive electrode;
a negative electrode; and
the nonaqueous electrolytic solution of claim 1 .
14. The electrochemical element of claim 13 , wherein the positive electrode comprises
a complex metal oxide comprising lithium and at least one of cobalt, manganese, and nickel, or
an olivine-type phosphate comprising lithium and at least one of iron, cobalt, nickel, and manganese.
15. The electrochemical element of claim 14 , wherein the negative electrode comprises at least one selected from the group consisting of a lithium metal, a lithium alloy, a carbon material capable of absorbing and releasing lithium, tin, a tin compound, silicon, a silicon compound, and a lithium titanate compound.
16. The electrochemical element of claim 13 , wherein the negative electrode comprises at least one selected from the group consisting of a lithium metal, a lithium alloy, a carbon material capable of absorbing and releasing lithium, tin, a tin compound, silicon, a silicon compound, and a lithium titanate compound.
17. The electrochemical element of claim 16 , wherein the carbon material capable of absorbing and releasing lithium is at least one of a graphitizable carbon, a non-graphitizable carbon having a lattice (002) spacing of 0.37 nm or more, and a graphite having a lattice (002) spacing of 0.34 nm or less.