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<p>High-nickel ternary cathodes are widely employed in lithium-ion batteries due to their better performance. Nevertheless, with the growing in nickel content, the material suffers from structural instability and poor cycling performance. In this study, Nb<sup>5+</sup> doping was carried out on LiNi<sub>0.90</sub>Co<sub>0.04</sub>Al<sub>0.06</sub>O<sub>2</sub> (NCA) cathode material by high temperature solid state method. The results of FTIR and XPS characterization show that Nb<sup>5+</sup> doping can reduce the carbonate content on the surface of the material. SEM and TEM results show that Nb<sup>5+</sup> doping can refine the primary particles and expand the lattice spacing of the material. In-situ XRD results show that the reversibility of the H2 → H3 phase transition of 1.0%Nb-NCA is well. Electrochemical results showed that the material of 1.0%Nb-NCA has a first discharge specific capacity of 188.12 mAh/g at 0.5 C and 2.5–4.3&#xa0;V, which is 21.86 mAh/g higher than that of the original sample, and the capacity retention rate is 91.60% after 100 cycles.</p>

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Investigation of the effect of Nb5+ doping on electrochemical properties of nickel-rich LiNi0.90Co0.04Al0.06O2 cathode materials

  • 期刊论文

  • 发表日期：

    2025年8月30日

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  • Jiatai Wang,
  • Jiting Li,
  • Xiaocen Yan,
  • Yuanyuan Li,
  • Hongyun Liu,
  • Xi Wen,
  • Cheng Qing,
  • Jian Li

摘要

High-nickel ternary cathodes are widely employed in lithium-ion batteries due to their better performance. Nevertheless, with the growing in nickel content, the material suffers from structural instability and poor cycling performance. In this study, Nb5+ doping was carried out on LiNi0.90Co0.04Al0.06O2 (NCA) cathode material by high temperature solid state method. The results of FTIR and XPS characterization show that Nb5+ doping can reduce the carbonate content on the surface of the material. SEM and TEM results show that Nb5+ doping can refine the primary particles and expand the lattice spacing of the material. In-situ XRD results show that the reversibility of the H2 → H3 phase transition of 1.0%Nb-NCA is well. Electrochemical results showed that the material of 1.0%Nb-NCA has a first discharge specific capacity of 188.12 mAh/g at 0.5 C and 2.5–4.3 V, which is 21.86 mAh/g higher than that of the original sample, and the capacity retention rate is 91.60% after 100 cycles.