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Structural, thermal, and impedance spectroscopic investigations of SeO2 doped Na-Si-Sn-P glass-ceramic electrolyte network for Na-ion batteries
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DOI：10.1007/s11581-026-06995-1.png)
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Abstract
En 中文
This study investigates SeO2-doped Na2O-SiO2-SnO2-P2O5 glass and glass-ceramic electrolytes synthesized via melt-quenching followed by dual-phase heat treatment for solid-state Na-ion batteries. Differential thermal analysis showed that 5 mol% SeO2 doping decreased T-g from 352 K (undoped) to 313 K, while increasing Delta T to 190 K upon 9 h heat treatment, indicating structural de-polymerization and thermal stability. XRD confirmed Na4Se10Si4 as the dominant crystalline phase with 92% crystallinity as revealed in dense microstructures with 450-570 nm grains. Impedance spectroscopy showed GC-Se-5-9 h(95[40Na(2)O-5SiO(2)-5SnO(2)-50P(2)O(5)]:5SeO(2):in mol%) achieved the highest bulk ionic conductivity of 1.84 & times; 10(-)(4) S/cm at 303 K with a low activation energy (0.408 eV), while electric modulus analysis indicated temperature-independent relaxation dominated by Na+ ion hopping through Na4Se10Si4 crystalline pathways predominantly. These results demonstrate that SeO2 doping facilitates non-bridging oxygen formation and controlled crystallization, enhancing Na+ mobility.
Keywords:
Glass and glass ceramic electrolyte
Ball milling
XRD
Electrical characterization
Bulk conductivity
Activation energy and relaxation energies
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