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<p>High ionic conductivity at reduced temperatures may allow electrochemical cell applications to be efficiently scaled up. Herein, we introduce an approach that exploits electrode-electrode synergy and in situ structural transformation to increase the ionic conductivity of an electrolyte within the electrochemical cell. This transformation is based on the formation of a Li<sub>2</sub>TiO<sub>3</sub>-Li<sub>2</sub>CO<sub>3</sub> heterostructure electrolyte via the combination of a TiO<sub>2</sub> semiconductor precursor, polystyrene spheres as the soft skeleton, and the lithium-based electrode LiNi<sub>0.8</sub>Co<sub>0.15</sub>Al<sub>0.05</sub>O<sub>2</sub>. The unique surface and interface of the heterostructure electrolyte enable the formation of long-range ion transport channels that lower electrode impedance, resulting in a superior ionic conductivity of 0.23 S cm<sup>−1</sup> at 550 °C and a high-power density of 1239 mW cm<sup>−2</sup>. Our general method to form superionic electrolytes shows potential in fuel cell technologies.</p>

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Superionic conduction electrolyte through in situ structural transformation in electrochemical cell

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月27日

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  • Ruoming Wang,
  • Guangping Yang,
  • Tianxiang Yang,
  • Yuzheng Lu,
  • Rizwan Raza,
  • Bin Zhu,
  • Peter D. Lund,
  • Sining Yun

摘要

High ionic conductivity at reduced temperatures may allow electrochemical cell applications to be efficiently scaled up. Herein, we introduce an approach that exploits electrode-electrode synergy and in situ structural transformation to increase the ionic conductivity of an electrolyte within the electrochemical cell. This transformation is based on the formation of a Li2TiO3-Li2CO3 heterostructure electrolyte via the combination of a TiO2 semiconductor precursor, polystyrene spheres as the soft skeleton, and the lithium-based electrode LiNi0.8Co0.15Al0.05O2. The unique surface and interface of the heterostructure electrolyte enable the formation of long-range ion transport channels that lower electrode impedance, resulting in a superior ionic conductivity of 0.23 S cm−1 at 550 °C and a high-power density of 1239 mW cm−2. Our general method to form superionic electrolytes shows potential in fuel cell technologies.