Nonaqueous electrolyte for rechargeable battery, and rechargeable battery with nonaqueous electrolyte

摘要

The present invention relates
to a nonaqueous electrolyte mainly comprising an electrolyte and a nonaqueous solvent dissolving the electrolyte, the nonaqueous electrolyte comprising: a monofluorophosphate and/or a difluorophosphate; and further at least one compound selected from the group consisting of compounds represented by the following general formula (1), nitrile compounds, isocyanate compounds, phosphazene compounds, disulfonic acid ester compounds, sulfide compounds, disulfide compounds, acid anhydrides, lactone compounds having a substituent in the ±-position, and compounds having a carbon-carbon triple bond:
[wherein R 1 , R 2 , and R 3 each independently represent a fluorine atom, an alkyl group which has 1-12 carbon atoms and may be substituted with a fluorine atom, or an alkoxy group which has 1-12 carbon atoms and may be substituted with a fluorine atom].