| abstract |
The present invention provides a nonaqueous electrolytic solution capable of improving electrochemical characteristics at high temperatures and reducing not only the capacity retention rate after a high temperature cycle test but also the rate of increase in electrode thickness, and an electricity storage device using the same. provide. In a non-aqueous electrolyte in which an electrolyte salt is dissolved in a non-aqueous solvent, diisocyanato represented by OCN-L-NCO (wherein L represents an alkylene group having 4 to 12 carbon atoms) in the non-aqueous electrolyte. A compound containing 0.001 to 5% by mass, and at least one selected from a specific phosphate compound, a specific cyclic sulfonate compound, an isocyanato compound having a specific ester structure, and a specific triple bond-containing compound A non-aqueous electrolyte containing 0.001 to 5% by mass, and an electricity storage device using the same. |