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<p>Large-scale application of 3&#xa0;C digital products such as mobile phones and laptops facilitates people’s daily life. However, these products iterate very fast, resulting in a lot of electronic wastes. Power supply used in digital products is mostly pouch lithium-ion batteries. In order to reduce environmental burden and achieve sustainable development, it is necessary to recycle discarded lithium-ion batteries. Separation and treatment of electrode plate is the first and foremost step in process of recycling discarded lithium-ion batteries. Herein, separation process of nickel cobalt manganese ternary cathode from discarded pouch lithium-ion batteries was studied in detail. The effects of different moisture environment of nickel cobalt manganese ternary (NCM811) cathode sheet from disassembled batteries, including resting in air, drying in 80&#xa0;°C blast oven and soaking in organic solvent N, N-dimethyl-formamide (DMF), to investigate the effect of trace water on cathode plate. Then pyrolysis, KOH dissolution, and ultrasonication in mixed solution of DMF and ethanol were adopted to separate cathode materials from aluminum current collector. The results of XRD, SEM and electrochemical tests indicate that the optimal pretreatment process as follows: soak cathode sheet in DMF for 24&#xa0;h, followed by ultrasonic separation in a mixed solution of ethanol and DMF (V<sub>DMF</sub>: V<sub>ethanol</sub> = 8:2). In addition, effects of impurities such as graphite, polyvinylidene difluoride (PVDF) and super P on NCM811 cathode materials after high temperature calcination were investigated.</p>

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Process study for the efficient separation of nickel cobalt manganese ternary cathode materials from discarded pouch lithium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Boxin Zheng,
  • Manni Chen,
  • Wei Wang,
  • Yaowei Feng,
  • Tianxing Kang,
  • Jiayan Liang,
  • Wenzhi Zheng,
  • Wei Yang

摘要

Large-scale application of 3 C digital products such as mobile phones and laptops facilitates people’s daily life. However, these products iterate very fast, resulting in a lot of electronic wastes. Power supply used in digital products is mostly pouch lithium-ion batteries. In order to reduce environmental burden and achieve sustainable development, it is necessary to recycle discarded lithium-ion batteries. Separation and treatment of electrode plate is the first and foremost step in process of recycling discarded lithium-ion batteries. Herein, separation process of nickel cobalt manganese ternary cathode from discarded pouch lithium-ion batteries was studied in detail. The effects of different moisture environment of nickel cobalt manganese ternary (NCM811) cathode sheet from disassembled batteries, including resting in air, drying in 80 °C blast oven and soaking in organic solvent N, N-dimethyl-formamide (DMF), to investigate the effect of trace water on cathode plate. Then pyrolysis, KOH dissolution, and ultrasonication in mixed solution of DMF and ethanol were adopted to separate cathode materials from aluminum current collector. The results of XRD, SEM and electrochemical tests indicate that the optimal pretreatment process as follows: soak cathode sheet in DMF for 24 h, followed by ultrasonic separation in a mixed solution of ethanol and DMF (VDMF: Vethanol = 8:2). In addition, effects of impurities such as graphite, polyvinylidene difluoride (PVDF) and super P on NCM811 cathode materials after high temperature calcination were investigated.