Charge–discharge curves and cycle performances for the LTAPO–PTFE–LiPF6–EC/DMC composite electrolyte cell were shown in Fig. 5(b) and (c), respectively. The first discharge capacity of the composite electrolyte cell reaches 118 mAh/g at a current rate of 0.06 mA/cm2 whereas the LTAPO–PTFE composite membrane cell shows no reaction due to high
resistance. The irreversible capacity during the first cycle is 2 mAh/g and the retention of
discharge capacity is about 97% after 5 cycles. The capacity of the composite electrolyte cell is
observed to be higher than that of a pure liquid electrolyte cell and that of our previous hybrid
electrolyte cell (LTAPO–liquid composite electrolyte) during cycles [22,28]. The higher
electrochemical properties of the composite electrolyte cell give enough flexibility to match the
volume change of the LiMn2O4. Moreover, the LTAPO–PTFE–LiFP6–EC/ DMC composite solid electrolyte
prevents manganese dissolution because of the low content of the liquid electrolyte [22].