| abstract |
The purpose of the present invention is to provide an electrolyte solution for secondary batteries, which improves the cycle characteristics of a secondary battery that operates at a high voltage and is used at high temperatures for a long period of time. The present invention relates to an electrolyte solution for secondary batteries, which is characterized by containing lithium difluorophosphate, a fluorine-containing ether compound, and a fluorine-containing phosphoric acid ester compound and/or a sulfone compound. |