NON-AQUEOUS ELECTROLYTE SOLUTION AND NON-AQUEOUS ELECTROLYTE SOLUTION SECONDARY BATTERY USING SAME

摘要

Objects of the invention are to provide nonaqueous electrolytic solutions that allow nonaqueous electrolyte secondary batteries to achieve improvements in initial battery characteristics and in battery characteristics after durability testing at the same time, and to provide nonaqueous electrolyte secondary batteries containing the nonaqueous electrolytic solutions. An aspect of the invention resides in a nonaqueous electrolytic solution for a nonaqueous electrolyte secondary battery including a positive electrode and a negative electrode capable of storing and releasing metal ions, the nonaqueous electrolytic solution including an electrolyte and a nonaqueous solvent and further including an aromatic carboxylate ester represented by Formula (1), or an aromatic carboxylate ester (I) represented by Formula (2) and at least one compound (II) selected from the group consisting of fluorine-containing cyclic carbonates, sulfur-containing organic compounds, phosphonate esters, cyano group-containing organic compounds, isocyanate group-containing organic compounds, silicon-containing compounds, aromatic compounds other than those of Formula (2), carboxylate esters represented by Formula (3), cyclic compounds having a plurality of ether bonds, monofluorophosphate salts, difluorophosphate salts, borate salts, oxalate salts and fluorosulfonate salts. Another aspect resides in a nonaqueous electrolyte secondary battery including a negative electrode and a positive electrode capable of storing and releasing lithium ions, and a nonaqueous electrolytic solution including an electrolyte and a nonaqueous solvent, the nonaqueous electrolytic solution being the nonaqueous electrolytic solution described above.