Patent ID: 7951495

Claim:
A non-aqueous electrolyte for a battery, which comprises an ionic liquid composed of a cation portion and an anion portion, and a supporting salt, characterized in that the cation portion of the ionic liquid contains phosphorus and nitrogen, and the ionic liquid is represented by the following general formula (I): (NPR 1 2 ) n (I) [wherein R 1 s are independently a halogen element or a monovalent substituent, provided that at least one of R 1 s is an ionic substituent represented by the following general formula (II): —N + R 2 3 X − (II) (wherein R 2 s are independently a monovalent substituent or hydrogen, provided that at least one of R 2 s is not hydrogen and R 2 s may be bonded with each other to form a ring; and X − is a monovalent anion); and n is 3 to 15].