Abstract
Mix-salts were prepared by mixing lithium borate (salt A or salt B) with lithium aluminate (salt C). Polymer electrolytes were prepared by dissolving lithium salt in PEO. Mix-salt polymer electrolytes exhibited higher ionic conductivities than pure-salt polymer electrolytes. The optimum-mixing ratio was investigated. Conductivity as high as 1 × 10 −4 S cm −1 at 40 °C was obtained for the optimized electrolyte system. A potential window of 4.3 V was determined for the mix-salt electrolyte. Good charge–discharge performance was observed for the mix-salt electrolyte composed cell, LiNi 0.8Co 0.2O 2//salt A(3)/salt C(11.8) 2/1-PEO 22//Li.
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