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<p>High-entropy oxides are a new class of functional ceramic materials with applications in thermoelectricity, catalysis, and superionic conductors. The (MgCoNiCuZn)₁₋ₓLiₓO high-entropy oxide, known for its Li superionic conductivity and excellent thermal/electrochemical stability, is a promising electrolyte material that enhances cycling stability and coulombic efficiency. Traditionally, (MgCoNiCuZn)₁₋ₓLiₓO is prepared by the solid-phase method, which requires sintering at 1000&#xa0;°C for 12&#xa0;h; however, this prolonged high-temperature process can result in the volatilization of alkali metal ions. To address this limitation, we developed a simple and efficient hydrothermal method that reduces both sintering temperature and time. Using this approach, lithium-doped high-entropy oxide (MgCoNiCuZn)₁₋ₓLiₓO was successfully synthesized. Using polyvinyl butyral (PVB) as a binder, high-density ceramics were obtained through buried powder sintering at 900&#xa0;°C for 3&#xa0;h. The resulting ceramics exhibit excellent ionic conductivity (σ = 1.3 × 10⁻³ S cm⁻¹, Eₐ = 0.25&#xa0;eV), comparable to previously reported values.</p>

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The ionic conductivity of Li-doped high entropy (MgCoNiCuZn)1−x Lix O obtained by hydrothermal method

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • He Li,
  • Fengyu Cui,
  • Miao Guo,
  • Jiaxin Zhang,
  • Yanyu Li

摘要

High-entropy oxides are a new class of functional ceramic materials with applications in thermoelectricity, catalysis, and superionic conductors. The (MgCoNiCuZn)₁₋ₓLiₓO high-entropy oxide, known for its Li superionic conductivity and excellent thermal/electrochemical stability, is a promising electrolyte material that enhances cycling stability and coulombic efficiency. Traditionally, (MgCoNiCuZn)₁₋ₓLiₓO is prepared by the solid-phase method, which requires sintering at 1000 °C for 12 h; however, this prolonged high-temperature process can result in the volatilization of alkali metal ions. To address this limitation, we developed a simple and efficient hydrothermal method that reduces both sintering temperature and time. Using this approach, lithium-doped high-entropy oxide (MgCoNiCuZn)₁₋ₓLiₓO was successfully synthesized. Using polyvinyl butyral (PVB) as a binder, high-density ceramics were obtained through buried powder sintering at 900 °C for 3 h. The resulting ceramics exhibit excellent ionic conductivity (σ = 1.3 × 10⁻³ S cm⁻¹, Eₐ = 0.25 eV), comparable to previously reported values.