| abstract |
The present invention provides a non-aqueous electrolytic solution that maintains the high-load charge-discharge cycle characteristics at high temperatures while suppressing a decrease in the thermal stability of the negative electrode and improving the safety of an electrical storage device, an electrical storage device using the same, and a phosphono group used therein. Formic acid compounds. The non-aqueous electrolytic solution in which the electrolyte salt is dissolved in the non-aqueous solvent contains 0.001 to 5% by mass of phosphonoformic acid compounds having at least one carbon-carbon unsaturated bond represented by the following general formula (I) and the following At least one compound among the phosphonoformic acid compounds represented by the above general formula (II) having a carbon-carbon unsaturated bond or two phosphonocarbonyl groups. (In formula (I), R 1 to R 3 are aliphatic organic groups, and at least one of R 1 to R 3 represents an aliphatic organic group having a carbon-carbon unsaturated bond.) (Formula ( In II), R 4 and R 5 represent an alkyl group, a cycloalkyl group, or an aryl group, and R 4 and R 5 can also be bonded to form a ring structure. m represents 1 or 2, and when m=1, R 6 represents an aromatic group group, when m=2, R 6 represents an alkylene group, an alkenylene group, or an alkynylene group, and a part of the hydrogen atoms of R 4 to R 6 may be substituted by a halogen atom.) |