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<p>Anode-free all-solid-state batteries (AFASSBs) are potential candidates for next-generation electric mobility devices that offer superior energy density and stability by eliminating Li from the anode. However, despite its potential to stabilize the interface between sulfide solid electrolytes (SEs) and anode-free current collectors (CCs) efficiently, a controllable approach to incorporating MoS<sub>2</sub> into AFASSBs has not yet been found. Herein, we propose a strategy for stabilizing the interface of Li-free all-solid-state batteries using controllable MoS<sub>2</sub> sacrificial thin films. MoS<sub>2</sub> was controllably grown on CCs by metal–organic chemical vapor deposition, and the MoS<sub>2</sub> sacrificial layer in contact with the SEs formed an interlayer composed of Mo metal and Li<sub>2</sub>S through a conversion reaction. In the AFASSBs with MoS<sub>2</sub>, Mo significantly reduces the nucleation overpotential of Li, which results in uniform Li plating. In addition, MoS<sub>2</sub>-based Li<sub>2</sub>S facilitates the formation of a uniform and robust SE interface, thereby enhancing the stability of AFASSBs. Based on these advantages, cells fabricated with MoS<sub>2</sub> exhibited better performance as both asymmetrical and full cells with LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> cathodes than did cells without MoS<sub>2</sub>. Moreover, the cell performance was affected by the MoS<sub>2</sub> size, and full cells having an optimal MoS<sub>2</sub> thickness demonstrated a 1.18-fold increase in the initial discharge capacity and a sevenfold improvement in capacity retention relative to SUS CCs. This study offers a promising path for exploiting the full potential of MoS<sub>2</sub> for interface stabilization and efficient AFASSB applications.</p>

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Tailoring Artificial Solid Electrolyte Interphase via MoS2 Sacrificial Thin Film for Li-Free All-Solid-State Batteries

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月18日

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  • Dong-Bum Seo,
  • Dohun Kim,
  • Mee-Ree Kim,
  • Jimin Kwon,
  • Hyeong Jun Kook,
  • Saewon Kang,
  • Soonmin Yim,
  • Sun Sook Lee,
  • Dong Ok Shin,
  • Ki-Seok An,
  • Sangbaek Park

摘要

Anode-free all-solid-state batteries (AFASSBs) are potential candidates for next-generation electric mobility devices that offer superior energy density and stability by eliminating Li from the anode. However, despite its potential to stabilize the interface between sulfide solid electrolytes (SEs) and anode-free current collectors (CCs) efficiently, a controllable approach to incorporating MoS2 into AFASSBs has not yet been found. Herein, we propose a strategy for stabilizing the interface of Li-free all-solid-state batteries using controllable MoS2 sacrificial thin films. MoS2 was controllably grown on CCs by metal–organic chemical vapor deposition, and the MoS2 sacrificial layer in contact with the SEs formed an interlayer composed of Mo metal and Li2S through a conversion reaction. In the AFASSBs with MoS2, Mo significantly reduces the nucleation overpotential of Li, which results in uniform Li plating. In addition, MoS2-based Li2S facilitates the formation of a uniform and robust SE interface, thereby enhancing the stability of AFASSBs. Based on these advantages, cells fabricated with MoS2 exhibited better performance as both asymmetrical and full cells with LiNi0.6Co0.2Mn0.2O2 cathodes than did cells without MoS2. Moreover, the cell performance was affected by the MoS2 size, and full cells having an optimal MoS2 thickness demonstrated a 1.18-fold increase in the initial discharge capacity and a sevenfold improvement in capacity retention relative to SUS CCs. This study offers a promising path for exploiting the full potential of MoS2 for interface stabilization and efficient AFASSB applications.