All-solid-state Lithium Secondary Batteries Using Li2S–P2S5 Solid Electrolytes and LiFePO4 Electrode Particles with Amorphous Surface Layer

All-solid-state batteries using Li2S–P2S5 solid electrolyte and LiFePO4 glass ceramic electrode particles were constructed. The batteries were charged and discharged with reversible capacity of 110 mA h g−1. Amorphous oxide surface layer formed on LiFePO4 glass ceramic particles improved interfacial properties between LiFePO4 electrode and Li2S–P2S5 solid electrolytes.