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<p>A washing treatment process for cathode materials is crucial for eliminating residual lithium on the surface, which can effectively enhance lithium-ion battery cell performance. In this work, LiNi<sub>0.59</sub>Co<sub>0.3</sub>Ti<sub>0.1</sub>Al<sub>0.01</sub>O<sub>2</sub> (NCTA) cathode materials were synthesized using the co-precipitation method, and the effects of different washing durations with water were investigated. XRD results revealed that the synthesized sample was a single phase with a hexagonal layered structure of the <i>R</i>-3<i>&#xa0;m</i> space group. Rietveld refinements revealed that the washed sample exhibited lower cation mixing compared to the unwashed sample, which showed that the unwashed samples had particle agglomeration and the existence of Li residue on the surface of the cathode materials. Interestingly, after the washing treatment, the NCTA appeared as single crystal particles with clean, smooth surfaces. Charge/discharge studies demonstrated that the washed sample showed a significant increase in initial discharge capacity compared to the unwashed sample. The optimal washing duration was found to be 15&#xa0;min (W15), resulting in the best initial discharge specific capacity of 161.86 mAh/g at 0.1 C with a capacity retention of 81.9% after 100 cycles at room temperature. The W15 sample also shows a great rate capability compared to the unwashed sample, as evident by having a higher discharge capacity at each C-rate. This excellent performance can be attributed to the good structural integrity, single crystal morphology, and lower resistance of the W15 sample compared to the unwashed sample. This work demonstrates that the water washing treatment is efficient in removing Li residue on the surface and improving the electrochemical performances.</p> Graphical Abstract <p></p>

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Washing effect on high voltage single crystal of LiNi0.59Co0.3Ti0.1Al0.01O2 (NCTA) cathode materials by water

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Lailatul Isti’adzah,
  • Muhd Firdaus Kasim,
  • Kelimah Elong,
  • Farish Irfal Saaid,
  • Maziidah Hamidi,
  • Nurul Dhabitah Basri,
  • Anna Lia,
  • Azira Azahidi,
  • Ahmad Azmin Mohamad

摘要

A washing treatment process for cathode materials is crucial for eliminating residual lithium on the surface, which can effectively enhance lithium-ion battery cell performance. In this work, LiNi0.59Co0.3Ti0.1Al0.01O2 (NCTA) cathode materials were synthesized using the co-precipitation method, and the effects of different washing durations with water were investigated. XRD results revealed that the synthesized sample was a single phase with a hexagonal layered structure of the R-3 m space group. Rietveld refinements revealed that the washed sample exhibited lower cation mixing compared to the unwashed sample, which showed that the unwashed samples had particle agglomeration and the existence of Li residue on the surface of the cathode materials. Interestingly, after the washing treatment, the NCTA appeared as single crystal particles with clean, smooth surfaces. Charge/discharge studies demonstrated that the washed sample showed a significant increase in initial discharge capacity compared to the unwashed sample. The optimal washing duration was found to be 15 min (W15), resulting in the best initial discharge specific capacity of 161.86 mAh/g at 0.1 C with a capacity retention of 81.9% after 100 cycles at room temperature. The W15 sample also shows a great rate capability compared to the unwashed sample, as evident by having a higher discharge capacity at each C-rate. This excellent performance can be attributed to the good structural integrity, single crystal morphology, and lower resistance of the W15 sample compared to the unwashed sample. This work demonstrates that the water washing treatment is efficient in removing Li residue on the surface and improving the electrochemical performances.

Graphical Abstract