The carbazole compound is added to the lithium-ion battery and

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PROBLEM TO BE SOLVED : To provide : a carbazole compound having an effect of preventing overcharge of a lithium ion battery; and an electrolyte for a lithium ion battery containing the carbazole compound.SOLUTION : The carbazole compound is represented by general formula (1), where Rand Rare each independently a C1-6 fluoroalkyl group. A method of synthesizing a compound of general formula (1) comprises reacting 3, 6-dihydroxycarbazole with a compound of general formula ROSOCFin the presence of a base.