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This study, for the first time, establishes a redox-bipolar synergistic system for selectively leachingLeaching Li, Ni, Co, and Mn from mixed LiFePO4 and ternary battery wastes. In this system, H2O2 uniquely serves as both oxidant and reductant, enabling efficient leaching of valuable metals while retaining Fe and P in the solid phase. Under optimal conditions, leaching efficiencies of Li, Ni, Co, and Mn all exceed 99%, with only 0.15% Fe leached, demonstrating excellent selectivity. Formic acidFormic acid, composed solely of carbon, hydrogen, and oxygen, is used as the leachingLeaching agent without harmful waste. Its mild acidity facilitates high-efficiency, selective leachingSelective leaching. The mechanism is clarified using the Pourbaix diagrams. This method introduces a green, efficient, and scalable solution for recyclingRecycling spent lithium-ion batteriesSpent Lithium-Ion Batteries (LIBs). It also demonstrates the potential for simultaneous selective leachingSelective leaching of multiple components from mixed battery waste, contributing to ongoing advancements in sustainable recycling.

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Selective Leaching of Ni, Co, Mn, and Li from Mixed LiFePO4 and Ternary Cathode Battery Wastes via a Redox-Bipolar Synergistic System

  • 会议论文

  • 发表日期：

    2026年

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  • Tianyu Zhao,
  • Yeonuk Choi,
  • Farzaneh Sadri

摘要

This study, for the first time, establishes a redox-bipolar synergistic system for selectively leachingLeaching Li, Ni, Co, and Mn from mixed LiFePO4 and ternary battery wastes. In this system, H2O2 uniquely serves as both oxidant and reductant, enabling efficient leaching of valuable metals while retaining Fe and P in the solid phase. Under optimal conditions, leaching efficiencies of Li, Ni, Co, and Mn all exceed 99%, with only 0.15% Fe leached, demonstrating excellent selectivity. Formic acidFormic acid, composed solely of carbon, hydrogen, and oxygen, is used as the leachingLeaching agent without harmful waste. Its mild acidity facilitates high-efficiency, selective leachingSelective leaching. The mechanism is clarified using the Pourbaix diagrams. This method introduces a green, efficient, and scalable solution for recyclingRecycling spent lithium-ion batteriesSpent Lithium-Ion Batteries (LIBs). It also demonstrates the potential for simultaneous selective leachingSelective leaching of multiple components from mixed battery waste, contributing to ongoing advancements in sustainable recycling.