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<p>Electrolyte for high-temperature and high-voltage lithium metal batteries face challenges of thermally decomposition of lithium salt and interfacial corrosiveness with aluminum current collectors/cathode materials. Herein, we report a non-corrosive asymmetric lithium salt, i.e., lithium fluorinated aryl sulfonimide (LiFAS). Due to the fluorinated aryl substituent on the bis-sulfonylimide anion, the LiFAS exhibits several desirable physiochemical properties for high-temperature and high-voltage applications, i.e. high thermal stability (decomposition temperature ~388 °C), high voltage tolerance (anodic decomposition potential ~5.5 V vs. Li/Li<sup>+</sup>), and a high Li<sup>+</sup> transference number of 0.62. Moreover, the LiFAS is able to efficiently inhibit the notorious Al-corrosion issue by forming a dense Al(FAS)<sub>3</sub>/AlF<sub>3</sub> passivation layer on the surface of Al current collector. In addition, LiFAS could also promote the formation of inorganic-rich interphases on the cathode and anode. The unique advantages of LiFAS endow Li||NCM811 full cells great cycling stability and capacity retention at harsh cycling conditions (81% after 230 cycles at 60 °C and 4.5 V, 0.5 C charge/1 C discharge). This work inspires molecular engineering strategy for designing functional lithium salts to enhance the cycle life of LMBs under high-temperatures and high-voltages.</p>

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Non-corrosive asymmetric fluorinated aryl sulfonimide lithium salt for high-temperature and high-voltage lithium metal batteries

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月4日

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  • Zhi Liu,
  • Shuaishuai Yan,
  • Yang Lu,
  • Qingqing Feng,
  • Xiao Ma,
  • Pan Zhou,
  • Wenhui Hou,
  • Yu Ou,
  • Yuhao Wu,
  • Changjian Li,
  • Jian Feng,
  • Qingbin Cao,
  • Xuwen Peng,
  • Yingchun Xia,
  • Xuan Song,
  • Haiyu Zhou,
  • Hao Liu,
  • Kai Liu

摘要

Electrolyte for high-temperature and high-voltage lithium metal batteries face challenges of thermally decomposition of lithium salt and interfacial corrosiveness with aluminum current collectors/cathode materials. Herein, we report a non-corrosive asymmetric lithium salt, i.e., lithium fluorinated aryl sulfonimide (LiFAS). Due to the fluorinated aryl substituent on the bis-sulfonylimide anion, the LiFAS exhibits several desirable physiochemical properties for high-temperature and high-voltage applications, i.e. high thermal stability (decomposition temperature ~388 °C), high voltage tolerance (anodic decomposition potential ~5.5 V vs. Li/Li+), and a high Li+ transference number of 0.62. Moreover, the LiFAS is able to efficiently inhibit the notorious Al-corrosion issue by forming a dense Al(FAS)3/AlF3 passivation layer on the surface of Al current collector. In addition, LiFAS could also promote the formation of inorganic-rich interphases on the cathode and anode. The unique advantages of LiFAS endow Li||NCM811 full cells great cycling stability and capacity retention at harsh cycling conditions (81% after 230 cycles at 60 °C and 4.5 V, 0.5 C charge/1 C discharge). This work inspires molecular engineering strategy for designing functional lithium salts to enhance the cycle life of LMBs under high-temperatures and high-voltages.