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<p>Na–β(β″)-Al<sub>2</sub>O<sub>3</sub> solid electrolyte materials were synthesized using the traditional solid-state reaction technique and modified by La<sub>2</sub>O<sub>3</sub> doping in this paper. A systematic investigation into the effects of La<sub>2</sub>O<sub>3</sub> doping on the microstructure and electrical properties of Na–β(β″)-Al<sub>2</sub>O<sub>3</sub> was conducted using XRD, SEM, and an electrochemical workstation. The results showed that the Na–β(β″)-Al<sub>2</sub>O<sub>3</sub> solid electrolyte, when doped with an appropriate amount of La<sub>2</sub>O<sub>3</sub>, exhibited an increased β″-Al<sub>2</sub>O<sub>3</sub> phase content and a uniform microstructure characterized by dense and well-formed grains. However, excessive doping of La<sub>2</sub>O<sub>3</sub> led to the formation of LaAlO<sub>3</sub> impurities and a reduction in density, which consequently resulted in a decline in ion conductivity. The optimized sample, doped with 0.50 wt% La<sub>2</sub>O<sub>3</sub> and a sintered at 1620&#xa0;°C, exhibited a composition comprising 83.45% of the β″-Al<sub>2</sub>O<sub>3</sub> phase. It exhibited a uniform and compact microstructure, achieving a relative density of 96.02% (3.1298&#xa0;g&#xa0;cm<sup>−3</sup>) compared to the theoretical density, along with a minimum AC impedance value of 4.37 Ω. Compared to the non-doped sample, which exhibited an ionic conductivity of 0.0156&#xa0;S&#xa0;cm<sup>−1</sup> at 300&#xa0;°C and a conductance activation energy of 0.1453&#xa0;eV, the optimized sample demonstrated significantly enhanced ionic conductivity (0.027&#xa0;S&#xa0;cm⁻<sup>1</sup> at 300&#xa0;°C) and a reduced conductance activation energy of 0.1055&#xa0;eV.</p>

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Influence of La2O3 addition on the electrical properties of Na–β(β″)-Al2O3 solid electrolyte

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Hongwei Zuo,
  • Tao Wang,
  • Xiaona Zhang,
  • Fusheng Song,
  • Zhumei Wang

摘要

Na–β(β″)-Al2O3 solid electrolyte materials were synthesized using the traditional solid-state reaction technique and modified by La2O3 doping in this paper. A systematic investigation into the effects of La2O3 doping on the microstructure and electrical properties of Na–β(β″)-Al2O3 was conducted using XRD, SEM, and an electrochemical workstation. The results showed that the Na–β(β″)-Al2O3 solid electrolyte, when doped with an appropriate amount of La2O3, exhibited an increased β″-Al2O3 phase content and a uniform microstructure characterized by dense and well-formed grains. However, excessive doping of La2O3 led to the formation of LaAlO3 impurities and a reduction in density, which consequently resulted in a decline in ion conductivity. The optimized sample, doped with 0.50 wt% La2O3 and a sintered at 1620 °C, exhibited a composition comprising 83.45% of the β″-Al2O3 phase. It exhibited a uniform and compact microstructure, achieving a relative density of 96.02% (3.1298 g cm−3) compared to the theoretical density, along with a minimum AC impedance value of 4.37 Ω. Compared to the non-doped sample, which exhibited an ionic conductivity of 0.0156 S cm−1 at 300 °C and a conductance activation energy of 0.1453 eV, the optimized sample demonstrated significantly enhanced ionic conductivity (0.027 S cm⁻1 at 300 °C) and a reduced conductance activation energy of 0.1055 eV.