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<p>In this study, zirconium dioxide (ZrO<sub>2</sub>) coatings are applied to LiNi<sub>0.6</sub>Co<sub>0.2</sub>Mn<sub>0.2</sub>O<sub>2</sub> (NCM622) cathode materials using atomic layer deposition (ALD) to enhance their cycling stability and high-voltage performance. The ZrO<sub>2</sub> coatings are deposited with thicknesses of 5&#xa0;nm and 10&#xa0;nm through 60 and 125 ALD cycles, respectively. The modified materials are characterized using various techniques including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). Electrochemical tests demonstrate that ZrO<sub>2</sub>-coated NCM622 materials exhibit improved cycling stability, with a significant reduction in capacity fading compared to the bare NCM622 material. However, thicker ZrO<sub>2</sub> coatings are found to hinder lithium-ion diffusion, which slightly compromises the rate capability. The results indicate that the ZrO<sub>2</sub> coating effectively depresses side reactions between cathode material and electrolyte, preserving the structural integrity of the cathode during cycling. This study provides insight into the potential of surface modification to improve the performance of high-nickel cathode materials in lithium-ion batteries.</p>

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Atomic layer deposition of ZrO2 coated LiNi0.6Co0.2Mn0.2O2 cathode with enhanced high-voltage cycling performance

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Yao Yao,
  • Jie Xiao,
  • Yiyong Zhang,
  • Peng Dong,
  • Yannan Zhang,
  • Yingjie Zhang

摘要

In this study, zirconium dioxide (ZrO2) coatings are applied to LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode materials using atomic layer deposition (ALD) to enhance their cycling stability and high-voltage performance. The ZrO2 coatings are deposited with thicknesses of 5 nm and 10 nm through 60 and 125 ALD cycles, respectively. The modified materials are characterized using various techniques including X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). Electrochemical tests demonstrate that ZrO2-coated NCM622 materials exhibit improved cycling stability, with a significant reduction in capacity fading compared to the bare NCM622 material. However, thicker ZrO2 coatings are found to hinder lithium-ion diffusion, which slightly compromises the rate capability. The results indicate that the ZrO2 coating effectively depresses side reactions between cathode material and electrolyte, preserving the structural integrity of the cathode during cycling. This study provides insight into the potential of surface modification to improve the performance of high-nickel cathode materials in lithium-ion batteries.