A highly conductive Na3V2(PO4)3 ceramic sheet prepared by tape-casting method. (10th May 2019)

• Record Type: Journal Article
• Authors: Wang, He; Hasegawa, George; Akiyama, Yuto; Yamamoto, Takahisa; Inoishi, Atsushi; Akamatsu, Hirofumi; Inada, Miki; Ishihara, Tatsumi; Hayashi, Katsuro
• Is Part Of: Electrochimica acta. Volume 305(2019)
• Page Start: 197
• Page End: 203
• Publication Date: 2019-05-10
• Subjects: Na ion battery -- All solid-state battery -- Phosphate glass -- Electrochemical impedance -- Gas impermeability; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2019.03.057
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Ceramic sheets of Na3 V2 (PO4 )3 (NVP) with NASICON-related structure have been prepared by tape-casting method. The addition of 60Na2 O-10Nb2 O5 -30P2 O5 glass to NVP is demonstrated to enhance markedly the density of the sintered NVP sheet and its electrical conductivity. The best densified NVP sheet with a thickness of a few tens of μm is obtained by sintering tape-casted NVP added with 5 wt% glass at 920 °C, which exhibits a total conductivity of 2.9 × 10 −5 S cm −1 at room temperature. A Pt | NVP sheet | Pt cell works as a tiny solid-state battery with a cell potential of 1.7 V, in which NVP acts as both cathode and anode active materials via redox reactions of V 4+ /V 3+ and V 3+ /V 2+ as well as a Na + ion conducting electrolyte between the two electrode layers.