Some fluoro organic lithium salts have attractive features as organic electrolyte such as solubility, conductivity, and oxidation potentials. The fluoro organic lithium salts with SO, groups show higher conductivities than those with CO groups. Methide (CF3SO2)(2)CLi and imide (RfSO(2))(2)NLi salts show higher conductivities than oxide salts RfSO(2)OLi with only one RfSO(2) group. The lithium salts with long fluoroalkyl groups and two or more RfSO(2) groups show high oxidation potentials and high aluminum corrosion potentials over 4.3 V. The battery performances of modified imide salts such as (C2F5SO2)(2)NLi, (C4F9SO2)(CF3SO2)NLi, and ((CF3)(2)CHOSO2)(2)NLi are satisfactory. The cycle characteristics of the imide salt cells are better than those of the LiPF6 cell. Especially, the ((CF3)(2)CHOSO2)(2)NLi shows the best cycle characteristics. In XPS analysis the anode surfaces of the imide cells are covered with imide salt components.