Electrochemical Performance of PEO₁₀LiX-Li₂TiO₃ Composite Polymer Electrolytes

The conductivities of polyethylene oxide (PEO)-based polymer electrolytes (PE) can be improved by the addition of inorganic inert powder. The composite polymer electrolytes (CPE) PEO₁₀LiX (X = ClO⁻₄ or N(CF₃SO₂ )₂ )-Li₂TiO₃ were prepared by solution casting with inorganic solid electrolyte Li₂liO₃ powder as a filler. Results showed that the conductivities of PEO₁₀LiClO₄-_-3wt% Li₂TiO₃ and PEO₁₀LiN(CF₃SO₂)₂-10wt% Li₂TiO₃ at 30 °C were 8.6×10⁻-⁶ and 5.6×10⁻-⁵ S·cm^−l, respectively. The conductivities of CPE increased with the decrease of filler's particle size. The ionic conduction mechanism analysis showed that there may be thee conduction routes in the CPE. i.e., PEO bulk, polymer-filler interface and Li₂TiO₃ crystal.