The ionic conductivities of LTAPO powder pellets, the LTAPO–
PTFE composite membrane, and the LTAPO–PTFE–LiPF6–EC/DMC com- posite electrolyte are determined to
be 8.36 × 10− 4, 9.52 × 10− 8 and
1.27 × 10− 4 S/cm, respectively. Consequently, ionic conductivity of