| 摘要 |
PURPOSE:To provide electrolyte which is excellent in charge/discharge efficiency and acid-resistance by using fluorine-substituted carboxylic acid ester of a specified structure. CONSTITUTION:Fluorine-substituted carboxylic acid can be expressed by a general formula of R1COOR2. In the formula, R1 is H or a saturated hydrocarbon group, R2 is a saturated hydrocarbon group, and at least one of R1, R2 is substituted by fluorine. The total number of C-atoms in R1, R2 is 1-6, and the saturated hydrocarbon radical of R1 and/or R2 may include an O-atom or N-atom. For this organic solvent, concretely, fluorine-replaced matter such as methyl formate or methyl acetate, or methoxymethyl formate or the like may be used, and Li-including salt such as lithium phosphate hexafluoride is used as solute to be added to this organic solvent for forming electrolyte for an Li secondary battery. In this constitution, electrolyte having high charge/ discharge efficiency and excellent acid resistance can be provided.
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