| 摘要 |
Electrolyte solutions for an electrochemical energy device, including a lithium secondary battery, comprising (a) a supporting electrolyte salt and (b) a solvent composition comprising (1) at least one of a cyclic carbonic acid ester solvent and (2) at least one fluorine-containing solvent having a boiling point of at least 80° C., selected from among the following chemical formulas (i) to (iii): (i) R<SUB>1</SUB>-O-R<SUB>f1</SUB>; (ii) R<SUB>2</SUB>-O-(R<SUB>f2</SUB>-O)<SUB>p</SUB>-(R<SUB>f3</SUB>-O)<SUB>q</SUB>-R<SUB>3</SUB>; (iii) A-(O-R<SUB>f4</SUB>)<SUB>m </SUB>(where the definition of each formula is as described in the claim)
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