The two materials were completely mixed by using an
agate mortar and pestle. The mixture was rolled into thin sheets and punch stamped into 16 mm
diameter circular disks. The thin sheet com- posite membrane was then soaked in organic liquid
electrolyte (1 M LiPF6 in EC/DMC) and any excess liquid electrolyte was removed resulting in a
solid-state. In the finial composite electrolyte, the weight
percentage of LTAPO:PTFE:liquid electrolyte is 70:15:15.