Patent ID: 8735004

Claim:
A nonaqueous electrolyte solution comprising: a nonaqueous solvent; an electrolyte salt; and an overcharge inhibitor comprising a polymerizable monomer as a repeating unit, being represented by the following chemical formula (1): X a Y b (1) where X is one polymerizable monomer, and has a functional group that is electropolymerized at a potential of 4.3 to 5.5 V based on a lithium metal reference, the functional group having an aromatic group; Y is the other polymerizable monomer, has an ether bond or an ester bond, and may be the X; subscript “a” is an integer number of 1 or more; subscript “b” is 0 or an integer number of 1 or more; and a number average molecular weight of the overcharge inhibitor is in a range of 3000 to 1000000.