Conductivity of lithium imide in mixed aprotic solvents for lithium cells

摘要

Electrolyte conductivities of LiN(CF_3SO_2)_2 in the single solvents and binary solvent mixtures of propylene carbonate (PC) with methyl acetate (MA), ethyl acetate (EA) or propyl acetate (PA) have been determined at temperatures from - 40 to 55℃. Optimized binary mixed solvent electrolyte solutions were investigated in 23 mm diameter primary Li/MnO_2 button cells at 5 mA/cm~2. The electrolyte solution 1.25 M LiN(CF_3SO_2)_2 in 1:3 (volume ratio) PC:MA gave the highest conductivity as well as the best overall performance in button cells at temperatures from -40 to 55℃.