To realize an ideal interface between electrode and electrolyte, a single-phase all-solid-state lithium-ion battery is studied using Li3V2(PO4)3-based NASICON-type material as the cathode, anode, and electrolyte. A dense Li3-xV2-xAlx(PO4)3 pellet with the Pt current collectors on both the front and back surfaces successfully demonstrates charge-discharge reactions based on the V3+/V2+ (anode) and V3+/V4+ (cathode) redox systems at 373 K. Al substitutional doping for V brings the suppression of the electronic conductivity and increase in the ionic conductivity. As a result, Al-doped material (Li3V1.6Al0.4(PO4)3) exhibites the best charge-discharge performance in the Li3V2-xAlx(PO4)3 system (x=0 - 0.6) because of its high ionic conductivity and low electronic conductivity. The concept of a single-phase battery with a single material offers a new approach to avoid side reactions during cell fabrication of oxide-based all-solid-state lithium-ion batteries.
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