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Highly stable Na0.67(Ni0.25Mn0.75)1−xCuxO2 cathode substituted by Cu for sodium-ion batteries

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Abstract

P2-type Na0.67Ni0.25Mn0.75O2 is considered as one of the most promising cathode materials for sodium-ion batteries due to its high initial capacity and operating voltage based on the Ni2+/Ni4+ redox reaction. However, it suffers from rapid capacity decay caused by P2–O2 phase transition when the cutoff voltage is above 4.2 V (vs. Na+/Na). Herein, a high-voltage phase transition from P2 to an amorphous phase with poor crystallinity has been proved to be the main cause of material deterioration and Mn redox process is another cause. Cu-substituted Na0.67(Ni0.25Mn0.75)1−xCuxO2 (x = 0, 0.05, 0.1, 0.2) with active redox couples of Ni2+/Ni4+ and Cu2+/Cu3+ has been fabricated for solving these issues. It is proved that Cu substitution can reduce the Mn3+/Mn4+ reaction below 3 V (vs. Na+/Na) and suppress the high-voltage phase transition effectively at deep de-sodiated state, resulting in the significantly enhanced cycle life and rate capability of Na0.67Ni0.25Mn0.75O2.

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Funding

This study was financially supported by the National Natural Science Foundation of China (Grant 51874358, 51772333).

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, People’s Republic of China

    Guorong Hu, Yanhua Liu, Wei Li, Zhongdong Peng, Jiahui Wu, Zhichen Xue, You Shi, Ju Fan, Qian Sun, Yanbing Cao & Ke Du

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  1. Guorong Hu
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  2. Yanhua Liu
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  3. Wei Li
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  10. Yanbing Cao
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Correspondence to Yanbing Cao or Ke Du.

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Hu, G., Liu, Y., Li, W. et al. Highly stable Na0.67(Ni0.25Mn0.75)1−xCuxO2 cathode substituted by Cu for sodium-ion batteries. Ionics 27, 657–666 (2021). https://doi.org/10.1007/s11581-020-03820-1

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  • DOI: https://doi.org/10.1007/s11581-020-03820-1

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