| abstract |
The present invention provides a battery capable of improving cycle characteristics. Electrolyte solution is provided with the positive electrode 21 and the negative electrode 22, and the electrolyte solution is impregnated in the separator 23 provided between the positive electrode 21 and the negative electrode 22. As shown in FIG. The electrolyte solution contains a solvent, an electrolyte salt, and a sulfone compound having an acid anhydride group (-CO-O-CO-) and a sulfonyl group (-SO 2- ). Since the chemical stability of the electrolyte is improved, decomposition of the electrolyte is suppressed. This improves the cycle characteristics.n n n n Secondary battery, electrolyte solution, sulfone compound. |