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<p>LiNi<sub>0.885</sub>Co<sub>0.1</sub>Al<sub>0.015</sub>O<sub>2</sub> (NCA) is a nickel-rich cathode material renowned for its high specific capacity. However, its capacity degradation over cycling limits its electrochemical performance. This study aims to investigate the underlying mechanism of initial capacity fading in NCA-based lithium-ion cells (NCA-Li). NCA-Li batteries are fabricated, and their electrochemical performance is evaluated. The results show that specific capacity deteriorates with increasing C-rate. Under cycling at 0.28 C, the final reversible capacity is 258.19 mAh/g, whereas under 2.8 C cycling, the capacity decreases to 160.85 mAh/g. To explore the mechanism behind this capacity fading, scanning electron microscopy (SEM), powder X-ray diffraction (XRD), and incremental capacity curves are employed. The H2-H3 phase transition under elevated C-rate conditions exacerbates anisotropy, leading to significant surface cracking of secondary particles. Moreover, repeated cycling increases both charge transfer resistance and the Warburg impedance coefficient. Coupled with the enhanced cation mixing evidenced by XRD data, these results suggest that the reduced Li<sup>+</sup> diffusion capacity is a key contributor to the observed capacity fade in NCA-based cathodes. Accordingly, improving Li<sup>+</sup> diffusion capacity is identified as a pivotal strategy to alleviate capacity degradation. This investigation provides critical insights for the development of next-generation, high-energy, and long-lifespan NCA cathode batteries.</p>

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Investigation of Capacity Fading Phenomenon in LiNi0.885Co0.1Al0.015O2 Cathode Batteries at High-Rate Cycling

  • 期刊论文

  • 发表日期：

    2025年9月17日

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  • Jixuan Lu,
  • Wanzheng Lu,
  • Jiayi Yuan,
  • Peian Li,
  • Ruiting Xu,
  • Qianqian Wang

摘要

LiNi0.885Co0.1Al0.015O2 (NCA) is a nickel-rich cathode material renowned for its high specific capacity. However, its capacity degradation over cycling limits its electrochemical performance. This study aims to investigate the underlying mechanism of initial capacity fading in NCA-based lithium-ion cells (NCA-Li). NCA-Li batteries are fabricated, and their electrochemical performance is evaluated. The results show that specific capacity deteriorates with increasing C-rate. Under cycling at 0.28 C, the final reversible capacity is 258.19 mAh/g, whereas under 2.8 C cycling, the capacity decreases to 160.85 mAh/g. To explore the mechanism behind this capacity fading, scanning electron microscopy (SEM), powder X-ray diffraction (XRD), and incremental capacity curves are employed. The H2-H3 phase transition under elevated C-rate conditions exacerbates anisotropy, leading to significant surface cracking of secondary particles. Moreover, repeated cycling increases both charge transfer resistance and the Warburg impedance coefficient. Coupled with the enhanced cation mixing evidenced by XRD data, these results suggest that the reduced Li+ diffusion capacity is a key contributor to the observed capacity fade in NCA-based cathodes. Accordingly, improving Li+ diffusion capacity is identified as a pivotal strategy to alleviate capacity degradation. This investigation provides critical insights for the development of next-generation, high-energy, and long-lifespan NCA cathode batteries.