Na4+x[Sn1-xYxSi3.8P0.2O12]glass-ceramic electrolyte: Structure correlation with Interfacial resistance and electrochemical performance
This investigation focuses on preparing glass and glass-ceramic Na4+x[Sn1-xYxSi3.8 P0.2O12; labeled as GC-NSYx] electrolytes with different molar percentages (x = 0, 0.2, 0.5, 0.7, and 1.0 mol%). The preparation done using melt quenching and subsequent heat treatments designed to enhance conductivit...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Chemical Physics Impact |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2667022424003268 |
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| Summary: | This investigation focuses on preparing glass and glass-ceramic Na4+x[Sn1-xYxSi3.8 P0.2O12; labeled as GC-NSYx] electrolytes with different molar percentages (x = 0, 0.2, 0.5, 0.7, and 1.0 mol%). The preparation done using melt quenching and subsequent heat treatments designed to enhance conductivity. The Rhombohedral Na5YSi4O12 (ICSD-20271) phase, within the space group R3̅c, emerged as the most stable and effective ion-conducting phase. In particular, the best ion conducting G-NSY1.0 glass electrolyte (σb = 2.88 × 10–5 S/cm) composition,further improved after heat treating it for 9 hours at its crystallization temperature (Tc) (GC-NSY1.0-9h; ΔT = 156 °C; σb = 4.89 × 10–4 S/cm) with superior thermal stability. Interestingly, the similarity between Eaτ and Eaσvalues indicates that both conductivity and relaxation mechanisms involve only ionic hopping. A full cell configuration using a NaMnO2: GC-NSY1.0-9h electrolyte with a Na–Sn alloy anode in a 7:3 ratio (GC-NSY1.0-9h electrolyte/anode) exhibited the lowest interfacial resistance of 145 ohms and achieved a specific capacity of 97 mAhg–1at 0.1C rate. This full cell also displayed excellent stability, irreversible capacity, and Coulombic efficiency (96 %) over 500 cycles which can be attributed to underlying oxidation and reduction reactions occurring during longer term cycling. |
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| ISSN: | 2667-0224 |