Lithium (Li) cycling efficiency by Li half cell tests and conductivity dependency on temperature are examined for LiAsF 6—ethylene carbonate (EC)/linear-structured solvent (LS) mixed solvent electrolytes, to obtain organic electrolyte systems with higher conductivity than EC/2-methyltetrahydrofuran (2MeTHF) and high Li cycling efficiency. Methyl formate, acetonitrile and methyl acetate are used as LSs. Conductivities for all the EC/LS mixed systems examined here are higher than EC/2MeTHF in the −30 to 25°C range. Although mixing of EC to LS was effective in the improvement of Li cycling efficiency for LS—single solvent electrolytes, there are no electrolyte systems having higher Li cycling efficiencies than EC/2MeTHF. Selection of organic electrolytes seems to depend largely on future application purposes and cathode compatibility.