| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery with superior charging and discharging efficiency, load characteristic and low temperature characteristic by using an electrolytic solution composed of a non-aqueous solvent including carboxylic acid anhydride having a carbon-carbon unsaturated bond and/or aromatic ring in a molecule, and an electrolyte. SOLUTION: A non-aqueous solvent is preferably prepared by adding 0.01-15 wt.% of a maleic acid anhydride derivative, a phthalic acid anhydride derivative, an acrylic acid anhydride derivative and a benzoic acid anhydride derivative of carboxylic and anhydride having a carbon-carbon unsturated bond and/or an aromatic ring in a molecule, to the total non-aqueous solvent, and mixing the same with at least one kind of cyclic carbonic ester and/or chained carbonic ester represented by a formula I and a formula II (R1-R4 are each H or 1-6C alkyl group). A lithium ion secondary battery consists of a non-aqueous electrolytic solution composed of lithium salt and the non-aqueous solvent, a negative electrode active material such as a carbon material or the like capable of doping and dedoping a lithium ion, and a positive electrode active material such as lithium transition metal composite oxide or the like. |
