| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous system electrolyte solution and a nonaqueous secondary battery using same with improved safety when overcharged. SOLUTION: The nonaqueous system electrolyte solution contains at least organic solvent and lithium salt as well as substituted oxazolizene compound as expressed in formula (1). In the formula, R1 denotes an organic group, and A denotes formula (1-1) (In the formula, R2 and R3 denote, each independently, hydrogen atom or a monovalent organic group.) or formula (1-2) (In the formula, R4 denotes a bivalent organic group having two free atomic valences on one atom). |
