| 摘要 |
PROBLEM TO BE SOLVED: To improve flame resistance without deteriorating battery characteristics by forming an electrolyte with an oligomer or polymer (A) having a Li salt of sulfonylimide as a side chain and an oligomer or a polymer (B) having an imidazolium salt of sulfonylimide as a side chain. SOLUTION: A component A has a very high degree of ion dissociation and superior Li ion conductivity. Its weight average molecular weight is preferably 500-100,000. A component B is a liquid molten salt at a temperature equal to or above -20 deg.C, and has flame resistance, so that it can impart flame resistance to the electrolyte without deteriorating electrolyte characteristics or battery characteristics even at low temperatures. Its weight average molecular weight is preferably 1,000-100,000. The content of the component A is preferably 0.1-3.0 mol/l as Li ion concentration. The content of the component B is preferably 10-90 wt.%. |
