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<p>This study examines the effectiveness of applying a Li<sub>3</sub>PO<sub>4</sub> (LPO) coating to copper current collectors (CC) and lithium metal anodes to enhance the cycling performance of two Li-ion battery types: anode-free Li-ion batteries (AFLBs) and lithium metal batteries (LMBs). In AFLBs, the LPO coating on Cu CC reduced the overpotential and resistance at the solid-electrolyte interphase, which in turn mitigated dendritic lithium plating and improved cycling stability. Specifically, a full-cell configuration using LiFePO<sub>4</sub> cathode paired with an LPO-coated CC achieved capacity retention of 90.0% after 100 cycles and an average Coulombic efficiency of 98.9% at a 0.2 C rate. For LMBs, lithium metal anodes with an LPO coating (LPO-LMA) exhibited enhanced stability in symmetric cell cycling, particularly beyond 300 cycles. Additionally, full cells incorporating LPO-LMA demonstrated improved capacity retention (74.8%) and Coulombic efficiency (99.2%) after 200 cycles. Overall, the stable and lithiophilic LPO thin film significantly enhances the electrochemical performance of both AFLBs and LMBs. </p>

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Impact of lithium phosphate thin film coatings on copper current collectors in anode-free li-ion batteries and on Li metal anodes in Li metal batteries

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Batdorj Khashbat,
  • Ga Yeon Lee,
  • Suk Jun Kim

摘要

This study examines the effectiveness of applying a Li3PO4 (LPO) coating to copper current collectors (CC) and lithium metal anodes to enhance the cycling performance of two Li-ion battery types: anode-free Li-ion batteries (AFLBs) and lithium metal batteries (LMBs). In AFLBs, the LPO coating on Cu CC reduced the overpotential and resistance at the solid-electrolyte interphase, which in turn mitigated dendritic lithium plating and improved cycling stability. Specifically, a full-cell configuration using LiFePO4 cathode paired with an LPO-coated CC achieved capacity retention of 90.0% after 100 cycles and an average Coulombic efficiency of 98.9% at a 0.2 C rate. For LMBs, lithium metal anodes with an LPO coating (LPO-LMA) exhibited enhanced stability in symmetric cell cycling, particularly beyond 300 cycles. Additionally, full cells incorporating LPO-LMA demonstrated improved capacity retention (74.8%) and Coulombic efficiency (99.2%) after 200 cycles. Overall, the stable and lithiophilic LPO thin film significantly enhances the electrochemical performance of both AFLBs and LMBs.