PURPOSE: To provide electrolyte of high electric conductivity, and achieve excellent cycle characteristics, and properties such as large capacity as it is assembled in a battery by using Li(CF3SO2)2N as the electrolyte.
CONSTITUTION: An Li battery comprises a positive electrode comprising active material of metal oxide or sulfate, carbon material which is capable of storing/ discharging metal Li, Li alloy or Li ion, and nonaqueous electrolyte, where 1-2 sort(s) of ethylene carbonate, propylene carbonate, and θ-lactone selected as high dielectric constant solvent is mixed with l-2 sort(s) of dimethyl carbonate. ethylmethyl carbonate, and fatty acid ester selected as low viscosity solvent to dissolve Li(CF3SO2)2N as electrolyte. A mixing ratio of Li(CF3SO2)2N to the nonaqueous solvent is 0.5-2.5mol/l.
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SANO NOBUKO
MIWA TOSHIYUKI
NARITA NOZOMI
