| abstract |
An electric storage device capable of operating stably in a high voltage range is provided. An electricity storage device of the present invention includes a positive electrode, a negative electrode, and an electrolytic solution, and the electrolytic solution includes a cyanoborate salt represented by the following general formula (1) and a solvent, and (i) a full charge. The positive electrode potential at the time is 4.0 V to 5.5 V on the basis of lithium, or (ii) the positive electrode includes a positive electrode active material exhibiting a discharge voltage of 3.5 V to 5.5 V on the basis of lithium. M n + ([B (CN) 4-a (X 2 R 13 ) a ] − ) n (1) (In the formula, M n + is a monovalent, divalent or trivalent organic or inorganic cation, X 2 is O or S, R 13 is H or a hydrocarbon group having 1 to 10 carbon atoms, and n is an integer of 1 to 3. A represents an integer of 0 to 3) [Selection] Figure 1 |