US 8,263,268 B2 · Ester compound, and non-aqueous electrolyte solution and lithium secondary battery each using the ester compound

Abstract

The present invention includes (1) an ester compound having a specific structure, (2) a nonaqueous electrolytic solution for lithium secondary battery comprising an electrolyte dissolved in a nonaqueous solvent and containing an ester compound having a specific structure in an amount of from 0.01 to 10% by weight of the nonaqueous electrolytic solution, which is excellent in initial battery capacity and cycle property, and (3) a lithium secondary battery comprising a positive electrode, a negative electrode and a nonaqueous electrolytic solution of an electrolyte salt dissolved in a nonaqueous solvent, wherein the nonaqueous electrolytic solution contains an ester compound having a specific structure in an amount of from 0.01 to 10% by weight of the nonaqueous electrolytic solution.

Claims5

Dependent claims

A nonaqueous electrolytic solution for a lithium secondary battery, the solution comprising an electrolyte dissolved in a nonaqueous solvent and an ester compound represented by formula (III) in an amount of from 0.01 to 10% by weight of the nonaqueous electrolytic solution:

wherein:
R11, R13, R14 and R15 each independently represent a hydrogen atom or a fluorine atom;
R12 represents a hydrogen atom, a fluorine atom, a methoxy group or an ethoxy group;
at least one of R11 to R15 is a fluorine atom;
L2 represents an alkenyl group having from 2 to 6 carbon atoms, an alkynyl group having from 3 to 6 carbon atoms, or a biphenyl group.

2 more elements

Dependencies are inferred from the claim text.

Ester compound, and non-aqueous electrolyte solution and lithium secondary battery each using the ester compound

Life of this patent

Ester compound, and non-aqueous electrolyte solution and lithium secondary battery each using the ester compound

Life of this patent

Abstract

Claims5