Nonaqueous electrolyte solution and nonaqueous electrolyte battery using same

1. A nonaqueous electrolyte solution comprising a lithium salt and a nonaqueous organic solvent, wherein said nonaqueous electrolyte solution comprises a sulfonic acid ester of the formula (1):

wherein L represents a Z-valent organic group which may have a substituent;

R represents a chain hydrocarbon group having an unsaturated bond, which may have a substituent; and

Z is an integer of 1 or more, and when Z is 2 or more, each R may be the same or different, wherein when Z is 1, L is an alkynyl group; and

wherein R and L do not combine with each other to form a ring.

2. The nonaqueous electrolyte solution as claimed in claim 1 , wherein in the formula (1), L is an organic group selected from the group consisting of an alkyl group, an alkylene group, an alkenyl group, an alkenylene group, an alkynyl group and an alkynylene group, each having a carbon number of 1 to 8, which may have a substituent, and

R is an alkenyl group or an alkynyl group, each having a carbon number of 2 to 8, which may have a substituent.

3. The nonaqueous electrolyte solution as claimed in claim 1 , wherein in the formula (1), L is an organic group selected form the group consisting of an alkylene group, an alkenyl group, an alkenylene group, an alkynyl group and an alkynylene group, which may have a substituent, and

R is a vinyl group.

4. The nonaqueous electrolyte solution as claimed in claim 1 , which comprises from 0.001 to 10 mass % of said sulfonic acid ester represented by the formula (1).

5. The nonaqueous electrolyte solution as claimed in claim 1 , which comprises said sulfonic acid ester represented by the formula (1) and at least one compound selected from the group consisting of a fluorine atom-containing cyclic carbonate, a carbon-carbon unsaturated bond-containing cyclic carbonate, a monofluorophosphate, a difluorophosphate, an isocyanate compound, a cyclic sulfonic acid ester, an oxalate salt and a nitrile compound.

6. The nonaqueous electrolyte solution as claimed in claim 5 , which comprises from 5 to 90 mass % of a fluorine atom-containing cyclic carbonate.

7. The nonaqueous electrolyte solution as claimed in claim 5 , wherein the fluorine atom-containing cyclic carbonate is at least one compound selected from the group consisting of monofluoroethylene carbonate, 4,4-difluoroethylene carbonate, 4,5-difluoroethylene carbonate and 4,5-difluoro-4,5-dimethylethylene carbonate.

8. A nonaqueous electrolyte battery comprising negative and positive electrodes capable of occluding-releasing a lithium ion and a nonaqueous electrolyte solution, wherein said nonaqueous electrolyte solution is the nonaqueous electrolyte solution of claim 1 .