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<p>To enhance the recovery efficiency of the cathode electrode material and reduce agglomeration of recovered electrode particles, low-temperature pyrolysis was carried out to deactivate the adhesive polyvinylidene fluoride (PVDF) in Nickel-Cobalt-Manganese (NCM) ternary batteries. The results show that the adhesive can be efficiently deactivated at a temperature lower than its thermal decomposition point. During pyrolysis, high-valence metals such as Co<sup>3+</sup> and Mn<sup>4+</sup> can be reduced to lower states by 24 and 37%, respectively. The reduction of transition metals poses challenges for the direct regeneration of the recovered cathode material. Meanwhile, the pyrolysis treatment significantly enhances metal leaching efficiency, which benefits downstream hydrometallurgy. It reduces both the time required for leaching and the concentration of acid needed. The maximum dissociation efficiency and favorable leaching properties were achieved by pyrolyzing the sample at 400&#xa0;°C for 30&#xa0;min.</p> Graphical Abstract <p></p>

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Low Temperature Pyrolysis Treatment of Used Lithium-ion Battery for Enhancing Cathode Electrode Material Recovery Efficiency

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Yikai Min,
  • Chenyu Chen,
  • Qin Wang,
  • Qunxing Huang

摘要

To enhance the recovery efficiency of the cathode electrode material and reduce agglomeration of recovered electrode particles, low-temperature pyrolysis was carried out to deactivate the adhesive polyvinylidene fluoride (PVDF) in Nickel-Cobalt-Manganese (NCM) ternary batteries. The results show that the adhesive can be efficiently deactivated at a temperature lower than its thermal decomposition point. During pyrolysis, high-valence metals such as Co3+ and Mn4+ can be reduced to lower states by 24 and 37%, respectively. The reduction of transition metals poses challenges for the direct regeneration of the recovered cathode material. Meanwhile, the pyrolysis treatment significantly enhances metal leaching efficiency, which benefits downstream hydrometallurgy. It reduces both the time required for leaching and the concentration of acid needed. The maximum dissociation efficiency and favorable leaching properties were achieved by pyrolyzing the sample at 400 °C for 30 min.

Graphical Abstract