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<p>Halide solid electrolytes have emerged as highly attractive electrolyte materials owing to their excellent ionic conductivity and high oxidation potential. In this work, low-cost CuCl is employed as a dopant, and Cu⁺-doped Li₃InCl₆ is prepared via ball milling, yielding a series of novel Li₃₋<i>ₓ</i>Cu<i>ₓ</i>InCl₆ (0 ≤ <i>x</i> ≤ 0.4) electrolytes. Cu⁺ doping modifies the crystal structure and regulates the ionic conductivity of the material. Among them, Li₂.₉Cu₀.₁InCl₆ exhibits a lower activation energy and achieves a room-temperature ionic conductivity of 1.04 mS cm⁻¹. Cu⁺ doping enhances the air stability of Li₃InCl₆ and mitigates the degradation of ionic conductivity after air exposure. Furthermore, Cu⁺ doping reduces surface cracks, improves the deformability of the material, and lowers interfacial resistance. All-solid-state batteries using Li₂.₉Cu₀.₁InCl₆ as the electrolyte display superior capacity and cycling performance compared to those with pristine Li₃InCl₆. This work demonstrates that Cu⁺ doping is an effective strategy to boost ionic conductivity, improve air stability, and enhance the electrochemical performance of Li₃InCl₆.</p>

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Cu+ doping in Li3InCl6 for enhanced ionic conductivity and air stability

  • 期刊论文

  • 发表日期：

    2026年5月22日

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  • Shuze Sun,
  • Xuefang Ma,
  • Qingtao Wang

摘要

Halide solid electrolytes have emerged as highly attractive electrolyte materials owing to their excellent ionic conductivity and high oxidation potential. In this work, low-cost CuCl is employed as a dopant, and Cu⁺-doped Li₃InCl₆ is prepared via ball milling, yielding a series of novel Li₃₋ₓCuₓInCl₆ (0 ≤ x ≤ 0.4) electrolytes. Cu⁺ doping modifies the crystal structure and regulates the ionic conductivity of the material. Among them, Li₂.₉Cu₀.₁InCl₆ exhibits a lower activation energy and achieves a room-temperature ionic conductivity of 1.04 mS cm⁻¹. Cu⁺ doping enhances the air stability of Li₃InCl₆ and mitigates the degradation of ionic conductivity after air exposure. Furthermore, Cu⁺ doping reduces surface cracks, improves the deformability of the material, and lowers interfacial resistance. All-solid-state batteries using Li₂.₉Cu₀.₁InCl₆ as the electrolyte display superior capacity and cycling performance compared to those with pristine Li₃InCl₆. This work demonstrates that Cu⁺ doping is an effective strategy to boost ionic conductivity, improve air stability, and enhance the electrochemical performance of Li₃InCl₆.