Nippon Steel Chemical Co., Ltd.

Nippon Steel & Sumikin Chemical Co., Ltd.

Toshihiro Kumagai

Atsushi Kawada

Aya Tashiro

Disclosed is an ionic liquid which is stable over a wide potential range and exhibits a high ionic conductivity. The ionic liquid comprises a cyclic guanidine salt represented by the following formula (1): wherein Rand Reach is independently an alkyl group or an alkoxyalkyl group, X is a methylene group, an oxygen atom, a sulfur atom, or RN; Ris an alkyl group, an alkoxyalkyl group, or an acyl group; l, m, and n each is an integer in the range of 1-6; Yis a monovalent anion such as (RSO)N, RSO, RCOO, BF, PF, NO, (CN)N, (CHO)N, NCS, ROSO, RSOS, and a halogen ion. The ionic liquid is useful for a variety of electrolytes, particularly for electrolytes of electrochemical cells.

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Kitakyushu, Japan

Toshihiro Kumagai