LITHIUM SECONDARY BATTERY

摘要

The present invention relates to a secondary battery cg a positive electrode capable of absorbing and releasing lithium, and a electrolyte solution containing a non-aqueous electrolytic solvent, wherein the positive electrode has a positive electrode active material which operates at 4.5 V or more relative to lithium, and wherein the non-aqueous electrolytic solvent contains a sulfone compound represented by a predetermined formula and a fluorinated ether compound represented by a predetermined formula.

主权项

1. A secondary battery comprising a positive electrode capable of absorbing and releasing lithium, and an electrolyte solution comprising a non-aqueous electrolytic solvent,
wherein the positive electrode has a positive electrode active material which operates at 4.5 V or more versus lithium, and wherein the non-aqueous electrolytic solvent comprises a sulfone compound represented by the following Formula (1) and a fluorinated ether compound represented by the following Formula (2): (in Formula (1), R1 and R2 each independently represent substituted or unsubstituted alkyl group. A carbon atom of R1 and a carbon atom of R2 may be bonded through a single bond or double bond to form a cyclic structure.)
R1—O—R2  (2) (in Formula (2), R1 and R2 each independently represent alkyl group or fluorinated alkyl group, and at least one of R1 and R2 is fluorinated alkyl group.)