| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a non-aqueous electrolytic solution suitable for a lithium secondary battery in which the coating is hardly separated since a strong coating can be formed on the surface of a negative electrode, reaction of the electrolytic solution and the negative electrode can be suppressed even at high temperature since it hardly melts, and further, which has excellent battery characteristics (charge and discharge cycle characteristics, high discharge capacity), ion conductivity, safety, etc. <P>SOLUTION: The non-aqueous electrolytic solution contains (I) a solvent for electrolyte salt dissolution containing a fluorine-contained ester solvent (A) as shown in a formula (A): R<SP>1</SP>CFXCOOR<SP>2</SP>(wherein, R<SP>1</SP>is hydrogen atom, fluorine atom, or alkyl group of carbon number 1-3 in which hydrogen atom may be substituted by fluorine atom, X is hydrogen atom or fluorine atom, provided that X is hydrogen atom when R<SP>1</SP>is hydrogen atom or perfluoroalkyl group, R<SP>2</SP>is alkyl group of carbon number 1-4) and a fluorine-contained solvent (B) other than the fluorine-contained ester solvent (A), and an electrolyte salt (II). <P>COPYRIGHT: (C)2009,JPO&INPIT |
