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<p>The development of high-energy all-solid-state batteries is critically hindered by the electrochemical instability of solid electrolytes against high-voltage oxide positive electrodes. While fluorination is a promising strategy to enhance electrolyte stability, conventional methods are ineffective, resulting in insufficient fluorine content and a debilitating trade-off with ionic conductivity. Here, we report a solid-state anion-exchange strategy that overcomes these limitations by producing core-shell Li-fluoride/LiCl nanocomposite precursors. These precursors enable the synthesis of heavily fluorinated lithium-halide and lithium-sulfide electrolytes that combine high ionic conductivity with good oxidative stability. This stability originates from the formation of a robust, self-limiting LiF-rich interphase at the positive electrode. Consequently, an all-solid-state battery using a Li-rich oxide positive electrode achieves high performance, retaining over 77.5% capacity after 2000 cycles at a high rate of 3 C (1 C = 275 mA/g) and a 5.0 V cutoff. This anion-exchange approach is broadly applicable to other systems and establishes a versatile platform for designing advanced fluorinated materials for next-generation batteries.</p>

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Anion-exchange fluorinated ion conductors for stable high-voltage lithium battery

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月22日

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  • Qiaodong Li,
  • Jingming Yao,
  • Yiran Wang,
  • Xinyu Liu,
  • Jiuwei Lei,
  • Wen Yin,
  • Zhixuan Yu,
  • Shaojie Wang,
  • Lin Li,
  • Xinlin Yan,
  • Zongpu Shao,
  • Zhenyu Wang,
  • Wei Xia,
  • Yue Chen,
  • Chuang Yu,
  • Lin Wang,
  • Bin Wen,
  • Bo Xu,
  • Jianyu Huang,
  • Long Zhang

摘要

The development of high-energy all-solid-state batteries is critically hindered by the electrochemical instability of solid electrolytes against high-voltage oxide positive electrodes. While fluorination is a promising strategy to enhance electrolyte stability, conventional methods are ineffective, resulting in insufficient fluorine content and a debilitating trade-off with ionic conductivity. Here, we report a solid-state anion-exchange strategy that overcomes these limitations by producing core-shell Li-fluoride/LiCl nanocomposite precursors. These precursors enable the synthesis of heavily fluorinated lithium-halide and lithium-sulfide electrolytes that combine high ionic conductivity with good oxidative stability. This stability originates from the formation of a robust, self-limiting LiF-rich interphase at the positive electrode. Consequently, an all-solid-state battery using a Li-rich oxide positive electrode achieves high performance, retaining over 77.5% capacity after 2000 cycles at a high rate of 3 C (1 C = 275 mA/g) and a 5.0 V cutoff. This anion-exchange approach is broadly applicable to other systems and establishes a versatile platform for designing advanced fluorinated materials for next-generation batteries.