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<p>Solid electrolytes are a key material for high-energy density and high-safety solid-state batteries. Research on lithium-ion transport mechanisms in solid-state electrolytes and cost control have been hot research topics. We synthesized a novel chloride solid-state electrolyte exhibiting excellent mechanical ductility by utilizing low-cost and low-density AlCl<sub>3</sub>. The 2.0Li<sub>2</sub>O-AlCl<sub>3</sub> electrolyte demonstrates an ionic conductivity of 2.4 × 10<sup>−4</sup> S/cm and an activation energy of 0.36&#xa0;eV. The low-cost and easily available AlCl<sub>3</sub> contributes to the low cost of this solid-state electrolyte. Notably, AlCl<sub>3</sub> acts as a solvent, facilitating the dissociation of lithium salts and enhancing ionic transport capabilities. The 2.0Li<sub>2</sub>O-AlCl<sub>3</sub> electrolyte exhibits a high redox potential and is compatible with high-voltage LiCoO<sub>2</sub> in solid-state batteries. This advancement opens up significant prospects for the research and development of AlCl<sub>3</sub>-based solid-state electrolytes.</p>

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Low-Cost Chloride Solid-State Electrolyte with Solvent-Like AlCl3 for High Ionic Conductivity

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Xuan Xiong,
  • Yuchen Qi,
  • Yongli Song

摘要

Solid electrolytes are a key material for high-energy density and high-safety solid-state batteries. Research on lithium-ion transport mechanisms in solid-state electrolytes and cost control have been hot research topics. We synthesized a novel chloride solid-state electrolyte exhibiting excellent mechanical ductility by utilizing low-cost and low-density AlCl3. The 2.0Li2O-AlCl3 electrolyte demonstrates an ionic conductivity of 2.4 × 10−4 S/cm and an activation energy of 0.36 eV. The low-cost and easily available AlCl3 contributes to the low cost of this solid-state electrolyte. Notably, AlCl3 acts as a solvent, facilitating the dissociation of lithium salts and enhancing ionic transport capabilities. The 2.0Li2O-AlCl3 electrolyte exhibits a high redox potential and is compatible with high-voltage LiCoO2 in solid-state batteries. This advancement opens up significant prospects for the research and development of AlCl3-based solid-state electrolytes.