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Effects of raw materials on the electrochemical performance of Na-doped Li-rich cathode materials Li[Li0.2Ni0.2Mn0.6]O2

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Abstract

Lithium-ion battery cathode materials Li1.2Ni0.2Mn0.6O2 and Li1.15Na0.05Ni0.2Mn0.6O2 were synthesized using different Na source through a facile ball-milling method. The XRD results reveal that all the cathode materials display a layered structure of solid solution. Charge/discharge tests demonstrate that the Li1.15Na0.05Ni0.2Mn0.6O2 electrode using LiAC and NaAC as raw materials shows an excellent electrochemical performance including high reversible discharge capacity (232 mAhg−1 at 0.2 C), enhanced rate capability (109 mAhg−1 at 5 C), and superior cycling stability (96.64% capacity retention after 80 cycles). Furthermore, EIS results also support that better raw materials can effectively decrease the charge transfer resistance and facilitate the Li diffusion coefficient of the as-prepared cathode material. It is also confirmed that the better electrochemical performance of the Na-doped sample Li1.15Na0.05Ni0.2Mn0.6O2 mainly come from the Na-doping process which stabilizes the host layered structure by suppressing the conversion from layered to spinel structure during cycling.

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Acknowledgments

This study was financially supported by the National Natural Science Foundation of China (Nos. 51504225 and 51404220) and Natural Science Foundation of Jiangsu Province (BK20150506 and BK20150535).

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Authors and Affiliations

  1. Zhengzhou Institute of Multipurpose Utilization of Mineral Resources, Zhengzhou, 450006, China

    Hongzhao Liu, Wei Wang & Bo Zhang

  2. Key Laboratory of Evaluation and Multipurpose Utilization of Polymetallic Ore of Ministry of Land and Resources, Zhengzhou, 450006, China

    Hongzhao Liu, Wei Wang & Bo Zhang

  3. JiangSu GE New Energy Technology Co., Ltd, Yangzhong, 212200, China

    Lei Tao

  4. School of Material Science and Technology Jiangsu University, Zhenjiang, 212013, China

    Mingru Su

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  1. Hongzhao Liu
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  2. Lei Tao
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  3. Wei Wang
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  4. Bo Zhang
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  5. Mingru Su
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Correspondence to Bo Zhang.

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Liu, H., Tao, L., Wang, W. et al. Effects of raw materials on the electrochemical performance of Na-doped Li-rich cathode materials Li[Li0.2Ni0.2Mn0.6]O2. Ionics 25, 959–968 (2019). https://doi.org/10.1007/s11581-018-2696-y

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  • DOI: https://doi.org/10.1007/s11581-018-2696-y

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