The present invention provides a novel electrolyte solution capable of providing electrochemical devices whose internal resistance is less likely to increase even after repeated charge and discharge and whose cycle capacity retention ratio is high. The electrolyte solution of the present invention contains a solvent, an electrolyte salt, and a phosphate in an amount of 0.001 to 15 mass% relative to the solvent and represented by the formula (1): (R11O)(R12O)PO2M.
本发明提供了一种新型电解质溶液,能够提供即使在反复充放电后内阻也不易增大且循环容量保持率高的电
化学装置。本发明的电解质溶液含有一种溶剂、一种电解质盐和一种
磷酸盐,相对于溶剂的用量为 0.001 至 15 质量%,并由式(1)表示:(R11O)(R12O)PO2M.