[11p-N104-1~13] 16.1 Fundamental properties, evaluation, process and devices in disordered materials

△ [11p-N104-13] Synthesis Na₃Zr₂Si₂PO₁₂ by liquid-phase sintering with NaPO₃ glass

〇(D)YONGZHENG JI¹, Tsuyoshi Honma¹, Komatsu Takayuki¹ (1.Nagaoka Univ. of Tech.)

Keywords:glass-ceramics, solid electrolyte, liquid-phase sintering method

Sodium super ionic conductor (NASICON)-type Na₃Zr₂Si₂PO₁₂ (NZSP) with the advantages of the high ionic conductivity, stability and safety is one of the most famous solid-state electrolytes. NZSP, however, requires the high sintering temperature about 1200°C and long sintering time in the conventional solid-state reaction (SSR) method. In this study, the liquid-phase sintering (LPS) method was applied to synthesize NZSP with the use of NaPO₃ glass having a low glass transition temperature of 292^oC. The sample sintered at 1000°C for 10 h exhibited a higher Na⁺ ion conductivity of 1.81 mS/cm at 100°C and a lower activation energy of 0.18 eV compared with the samples prepared by the SSR method. It is proposed that a new LPE method is effective for the synthesis of NZSP and the NaPO₃ glass has a great contribution to the Na⁺ diffusion at the grain boundaries.