Scholarlink

<p>This study investigates the modification of Na-<i>β</i>″-Al<sub>2</sub>O<sub>3</sub> solid electrolytes by employing TiO<sub>2</sub> as a sintering aid via a pressureless sintering process and systematically characterizes the influences of TiO<sub>2</sub> doping on the microstructure and electrochemical properties by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). For the optimized sample sintered at 1550 ℃ with 1 wt% TiO<sub>2</sub>, the <i>β</i>″ phase content is elevated from 97.26 to 99.43%, while the relative density is improved from 94.77 (3.09&#xa0;g·cm⁻<sup>3</sup>) to 97.62% (3.21&#xa0;g·cm⁻<sup>3</sup>); such synergistic optimization of the crystal structure and microstructure contributes to an excellent ionic conductivity of 0.204 S·cm⁻<sup>1</sup> at 350 ℃, which is a 71.43% enhancement compared with the undoped sample (0.119 S·cm⁻<sup>1</sup>), and the activation energy is reduced to 0.261&#xa0;eV. This work verifies that TiO<sub>2</sub> doping is a feasible and efficient approach to promote the densification and electrochemical performance of Na-<i>β</i>″-Al<sub>2</sub>O<sub>3</sub> solid electrolytes, laying a solid foundation for their further application in high-performance solid-state energy storage and conversion devices.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Sintering behavior and electrochemical properties of TiO2-doped Na-β″-Al2O3 solid electrolytes

  • 期刊论文

  • 发表日期：

    2026年7月2日

查看全文
  • Kun Wen,
  • Xiaoliang Zhou,
  • Limin Liu,
  • Li Zhang,
  • Qian Yang,
  • Yangyang Zhang,
  • Xiaoxi Meng,
  • Dingqian Wang,
  • Xinning Gong

摘要

This study investigates the modification of Na-β″-Al2O3 solid electrolytes by employing TiO2 as a sintering aid via a pressureless sintering process and systematically characterizes the influences of TiO2 doping on the microstructure and electrochemical properties by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). For the optimized sample sintered at 1550 ℃ with 1 wt% TiO2, the β″ phase content is elevated from 97.26 to 99.43%, while the relative density is improved from 94.77 (3.09 g·cm⁻3) to 97.62% (3.21 g·cm⁻3); such synergistic optimization of the crystal structure and microstructure contributes to an excellent ionic conductivity of 0.204 S·cm⁻1 at 350 ℃, which is a 71.43% enhancement compared with the undoped sample (0.119 S·cm⁻1), and the activation energy is reduced to 0.261 eV. This work verifies that TiO2 doping is a feasible and efficient approach to promote the densification and electrochemical performance of Na-β″-Al2O3 solid electrolytes, laying a solid foundation for their further application in high-performance solid-state energy storage and conversion devices.