Electrochemical properties and interfacial stability of (PEO)10LiCF3SO3–TinO2n−1 composite polymer electrolytes for lithium/sulfur battery

Electrochemical properties and interfacial stability of (PEO)10LiCF3SO3 composite polymer electrolytes (CPEs) with titanium oxide (TinO2n−1, n=1, 2) prepared by ball milling as ceramic filler are presented. The amount of titanium oxide powders introduced was between 5 and 15 wt.% into the (PEO)10LiCF3SO3 polymer electrolyte. The addition of titanium oxide which consisted of plate-like spherical shape ranging from sub-micron to several microns increases the ionic conductivity by an order of magnitude compared with (PEO)10LiCF3SO3 polymer electrolyte without titanium oxide, and also have the higher ionic conductivity at low temperature. Li/CPEs/50% S cells have a initial discharge capacity of between 1400 and 1600 mA h g−1-sulfur with current rate of 100 mA g−1-sulfur at 90 °C and show the higher initial charge/discharge performance than without titanium oxide. The interfacial stability was remarkably improved by the addition of titanium oxide into the (PEO)10LiCF3SO3 polymer electrolyte.