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<p>Lithium-ion batteries (LIBs) and plastics are integral to modern society, yet their escalating consumption poses significant risks to resource sustainability and the environment. This study introduces a co-upgrading method to repurpose spent lithium iron phosphate (LFP) cathode materials and graphite anodes into FeO<sub><i>X</i></sub>/graphite photothermal catalysts, which exhibit exceptional efficacy in photothermal glycolysis of waste polyethylene terephthalate (PET), achieving a PET conversion efficiency 3.1 times greater than traditional thermal methods at equivalent temperatures, while retaining high selectivity for valuable monomers. Techno-economic analysis confirms the strategy’s viability, revealing that processing one ton of waste PET via this photothermal approach could reduce greenhouse gas emissions by 0.345 t compared to conventional thermal processes. The work advances a sustainable framework for transforming discarded LIBs and plastic waste into high-value resources, supporting the transition toward a circular economy.</p>

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Repurposing spent LiFePO4 batteries for sustainable photothermal-upcycling of polyesters

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Xiangxi Lou,
  • Zhongyu Li,
  • Penglei Yan,
  • Muhan Cao,
  • Qiao Zhang,
  • Guiling Wang,
  • Panpan Xu,
  • Jinxing Chen,
  • Chunling Xie

摘要

Lithium-ion batteries (LIBs) and plastics are integral to modern society, yet their escalating consumption poses significant risks to resource sustainability and the environment. This study introduces a co-upgrading method to repurpose spent lithium iron phosphate (LFP) cathode materials and graphite anodes into FeOX/graphite photothermal catalysts, which exhibit exceptional efficacy in photothermal glycolysis of waste polyethylene terephthalate (PET), achieving a PET conversion efficiency 3.1 times greater than traditional thermal methods at equivalent temperatures, while retaining high selectivity for valuable monomers. Techno-economic analysis confirms the strategy’s viability, revealing that processing one ton of waste PET via this photothermal approach could reduce greenhouse gas emissions by 0.345 t compared to conventional thermal processes. The work advances a sustainable framework for transforming discarded LIBs and plastic waste into high-value resources, supporting the transition toward a circular economy.