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Enhanced interfacial and structural stability of Ni-rich LiNi0.96Mg0.02Ti0.02O2 cathode using a CeO2-coating technique

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Abstract

With the rapid development of electric vehicles in recent years, high-energy layered lithium Ni-rich oxides have attracted much attention. However, the ever-increasing cobalt price and stability issues of Ni-rich cathodes pose substantial obstacles to the practical application of lithium-ion batteries (LIBs). Here, we employed a one-step method to synthesize a CeO2-coating LiNi0.96Mg0.02Ti0.02O2 (NMT@Ce) cathode with reliable interface and structure. The CeO2 coating layer can prevent cathodes from electrolyte assault and form oxygen vacancies to improve the material thermal stability. The as-obtained LiNi0.96Mg0.02Ti0.02O2-0.5 wt% Ce (NMT@Ce-0.5%) delivers a high specific capacity (177.8 mAh·g−1 at 1 C) and good durability (96.7% after 100 cycles at 1 C). This modification method significantly enhances the stability of the interface and structure for Ni-rich Co-free cathode material, accelerating the commercialization of high-energy–density LIBs.

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Funding

This work was supported by the project of the National Natural Science Foundation of China (Grand No. 22005254).

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Author notes

  1. Yixian Xiao and Zhiqi Wang contributed equally to this work.

Authors and Affiliations

  1. Institute for Advanced Materials and Technology, University of Science and Technology, Beijing, Beijing, 100083, China

    Yixian Xiao, Zhiqi Wang, Kaixuan Cui, Zhihui Ma, Jie Shi, Kun Han & Ping Li

  2. School of Materials Science and Engineering Southwest, University of Science and Technology, Mianyang, 621010, People’s Republic of China

    Qi Wan

  3. Shanxi Beike Qiantong Energy Storage Science and Technology Research Institute Co. Ltd., 048400, Gaoping, China

    Qi Wan & Ping Li

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  1. Yixian Xiao
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Xiao, Y., Wang, Z., Wan, Q. et al. Enhanced interfacial and structural stability of Ni-rich LiNi0.96Mg0.02Ti0.02O2 cathode using a CeO2-coating technique. Ionics 28, 5039–5048 (2022). https://doi.org/10.1007/s11581-022-04748-4

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