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<p>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&#xa0;mol% SeO₂ doping decreased T<sub>g</sub> from 352&#xa0;K (undoped) to 313&#xa0;K, while increasing ΔT to 190&#xa0;K upon 9&#xa0;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&#xa0;nm grains. Impedance spectroscopy showed GC-Se<sub>5</sub>-9&#xa0;h(95[40Na<sub>2</sub>O-5SiO<sub>2</sub>-5SnO<sub>2</sub>-50P<sub>2</sub>O<sub>5</sub>]:5SeO<sub>2</sub>:in mol%) achieved the highest bulk ionic conductivity of 1.84 × 10⁻⁴ S/cm at 303&#xa0;K with a low activation energy (0.408&#xa0;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.</p>

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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

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • T. Naga Bhavani,
  • Balaji Rao Ravuri,
  • Vishal Singh,
  • Rambabu Vasamsetti,
  • P. Vijaya Kumar,
  • K. C. AcharyuluSrinivasula,
  • Kodumuri Veerabhadra Rao,
  • S. V. G. V. A. Prasad

摘要

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 Tg from 352 K (undoped) to 313 K, while increasing ΔT 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-Se5-9 h(95[40Na2O-5SiO2-5SnO2-50P2O5]:5SeO2:in mol%) achieved the highest bulk ionic conductivity of 1.84 × 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.