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<p>Research into solid electrolytes with high stability and ionic conductivity is essential for developing safe, high energy density Li-ion batteries, with garnet type (Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub>, LLZO) solid-state electrolyte being a promising candidate. However, its low room-temperature conductivity, high activation energy, and the requirement for high-temperature synthesis to achieve cubic LLZO limit its application. This study uses an optimized solid phase reaction method to prepare Nb-doped LLZO solid-state electrolyte by incorporating a variable ball milling duration, refined sintering conditions, and an optimized Nb doping concentration to systematically investigate its impact on microstructure and electrochemical performance analyzed using Raman analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The results revealed that the optimum concentration of the Nb doping sintered at 1200 ℃ for 2&#xa0;h achieved a high-performance Nb-doped LLZO solid state electrolyte as compared to undoped LLZO solid state electrolyte.</p>

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Improving the structural and electrochemical performance of Li7La3Zr2O12 solid state electrolyte by Nb doping

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Emmanuel Kwame Yadzo,
  • Yueming Li,
  • Binxuan Jiang,
  • Jiale Yuan,
  • Kai Li,
  • Xu Guo,
  • Zhenhua Chen

摘要

Research into solid electrolytes with high stability and ionic conductivity is essential for developing safe, high energy density Li-ion batteries, with garnet type (Li7La3Zr2O12, LLZO) solid-state electrolyte being a promising candidate. However, its low room-temperature conductivity, high activation energy, and the requirement for high-temperature synthesis to achieve cubic LLZO limit its application. This study uses an optimized solid phase reaction method to prepare Nb-doped LLZO solid-state electrolyte by incorporating a variable ball milling duration, refined sintering conditions, and an optimized Nb doping concentration to systematically investigate its impact on microstructure and electrochemical performance analyzed using Raman analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The results revealed that the optimum concentration of the Nb doping sintered at 1200 ℃ for 2 h achieved a high-performance Nb-doped LLZO solid state electrolyte as compared to undoped LLZO solid state electrolyte.