The electrochemical characteristic of solutions of lithium benzolsulfonate in dimethylsulfoxide is considered. DTA/TGA is employed to analyze the thermal stability of salt. The conductivity of solutions was determined. So, for example, conductivity lithium benzolsulfonate in dimethylsulfoxide is 3.8mSm/cm. The area electrochemical stability of solutions is in an interval 4.5–4.6V. Electrochemical properties of lithium manganese oxide spinel in tested solutions were investigated. The charge–discharge capacity of lithium manganese oxide spinel is 65mAhg−1 (in interval of potentials from 3.2 to 4.4V Li/Li+) and 190mAhg−1 (in interval of potentials from 1.8 to 4.0V Li/Li+) for vanadium oxide (V).