A solid-state
lithium battery is constructed by combining the composite electrolyte, a LiMn2O4 cathode, and a
LiMn2O4 anode. The use of LiMn2O4 on both electrodes is because the stable electrochemical window
of the compos- ite solid electrolyte reaches only 2.5–4.5 V by reducing Ti4+ to Ti3+ in the LTAPO.
The charge/discharge performance of the solid-state lithium battery has been investigated and the
results confirm that it can function effectively as a lithium battery.