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Co-modification of conductive graphite and Zr doping to enhance the Li-storage properties of Ni-rich binary cathode material

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Abstract

Ni-rich binary cathode materials have attracted much attention due to their high specific capacity, good performance-cost ratio, and environmental friendliness. However, their commercial application is limited by the problems of rapid capacity attenuation and poor cycling performance at high voltage. In this work, Zr and conductive ks-6 co-modified LiNi0.85Mn0.15O2 cathode materials are successfully synthesized through optimizing the proportion of modified components. The results show that the discharge capacity of LiNi0.85Mn0.15O2 co-modified with Zr and 2 wt% ks-6 (NMZ-2) increases from 182.71 mAh g−1 to 203.32 mAh g−1, and the capacity retention rate rises from 67.59 to 81.09% after 100 cycles at 1 C between 2.75 V and 4.35 V. The excellent Li-storage performance may be attributed to the synergistic effect of conductive ks-6 and Zr doping, which not only increases the electronic conductivity and reduces the electrode polarization, but also significantly reduces the cation mixing and inhibits the irreversible phase transition during cycling. The co-modified LiNi0.85Mn0.15O2 cathode material shows higher Ni3+ content and layer structure integrity, which enhance the reversibility and cycling stability of the electrode during cycling.

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Funding

The authors are grateful for the financial support of this work by Foundation of Jiangxi Educational Committee (No. GJJ190423, GJJ190427, and GJJ200850), Natural Science Foundation of Jiangxi Province (No. GJJ160601), Finance and Education Plan of Ganzhou City (Nos. 60[2019–2021]), and National Natural Science Foundation of China (No. 51874151).

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Authors and Affiliations

  1. Jiangxi Key Laboratory of Power Battery and Material, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, China

    Ganghua Li, Xianfa Rao, Wenli Yao, Min Zeng & Shengwen Zhong

  2. State Key Laboratory of Advanced Special Steel &, School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China

    Hongwei Cheng

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  1. Ganghua Li
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  2. Xianfa Rao
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  3. Wenli Yao
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  4. Min Zeng
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Correspondence to Wenli Yao.

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Li, G., Rao, X., Yao, W. et al. Co-modification of conductive graphite and Zr doping to enhance the Li-storage properties of Ni-rich binary cathode material. Ionics 28, 1055–1064 (2022). https://doi.org/10.1007/s11581-021-04369-3

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