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<p>Lithium metal is recognized as a promising alternative anode material for next-generation Li batteries. However, the growth of lithium dendrites due to uneven deposition of lithium and the side reactions caused by unstable solid–electrolyte interphase (SEI) films have seriously hindered the development of lithium metal batteries. Therefore, we cast a bifunctional dual-layer protective film of graphene oxide (GO) and SnF<sub>2</sub> onto a Li plate to address the above problems. As a result of the synergistic effect between the SnF<sub>2</sub>-derived LiSn alloy and GO layer, the symmetric cell with modified Li electrodes exhibited extraordinary cyclic stability close to 2900&#xa0;h when cycled at 0.5&#xa0;mA&#xa0;cm<sup>−2</sup> and 0.5&#xa0;m&#xa0;Ah&#xa0;cm<sup>−2</sup>. Ultralow interfacial impedance of only 3.6&#xa0;Ω was also obtained at the 50th cycle. This work presents a simple but effective modification strategy to improve the stability of lithium metal battery anodes.</p>

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Dual-Layer Multifunctional Protective Layer for Stable Lithium Anodes

  • 期刊论文

  • 发表日期：

    2025年4月27日

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  • Cong Wang,
  • Yue Li,
  • Yahao Li,
  • Xiaoxi Zheng,
  • Xuelin Yang

摘要

Lithium metal is recognized as a promising alternative anode material for next-generation Li batteries. However, the growth of lithium dendrites due to uneven deposition of lithium and the side reactions caused by unstable solid–electrolyte interphase (SEI) films have seriously hindered the development of lithium metal batteries. Therefore, we cast a bifunctional dual-layer protective film of graphene oxide (GO) and SnF2 onto a Li plate to address the above problems. As a result of the synergistic effect between the SnF2-derived LiSn alloy and GO layer, the symmetric cell with modified Li electrodes exhibited extraordinary cyclic stability close to 2900 h when cycled at 0.5 mA cm−2 and 0.5 m Ah cm−2. Ultralow interfacial impedance of only 3.6 Ω was also obtained at the 50th cycle. This work presents a simple but effective modification strategy to improve the stability of lithium metal battery anodes.