A polymer electrolyte composite has been prepared with Li
3PO
4 dispersion in a polyether-cross-linked polymer electrolyte system (PEO-PMA). From DSC measurements, it was confirmed that the glass-transition temperature (
Tg) of the polymer electrolyte tends to shift to higher temperature by the addition of Li
3PO
4. The ionic conductivity was decreased with the addition of Li
3PO
4, but the cationic mobility, estimated from the DC polarization measurements, was improved at higher temperature. From these results, it was suggested that Li
3PO
4 work as a carrier site for Li
+-transport in the polymer electrolyte. The addition of Li
3PO
4 also tended to suppress the resistance increase at the interface between Li deposited on a Ni substrate and the polymer electrolyte. Thus, the polymer electrolyte containing Li
3PO
4 dispersion as a filler has lower interface resistance so that it can provide better performances of a battery system using Li metal negative electrode.
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