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The multiple effects of Al-doping on the structure and electrochemical performance of LiNi0.5Mn0.5O2 as cathode material at high voltage

Ionics volume 24, pages 3705–3715 (2018)Cite this article

Abstract

The application of LiNi0.5Mn0.5O2 as a high-voltage cathode material for lithium-ion batteries is limited by its poor cycle performance. Therefore, we attempt to improve the cyclability of this material at high voltage by using a doping method and propose a detailed mechanism for the effect of the doping amount on the structure and electrochemical performance. In this work, LiNi0.5-zAlzMn0.5O2 (z = 0.00, 0.03, 0.05, 0.08) electrodes were prepared via a simple co-precipitation followed by a solid-state method. X-ray diffraction and Rietveld refinement revealed that a suitable amount of Al doping into LiNi0.5Mn0.5O2 can stabilize the structure and lower the Li/Ni cation mixing, but an excessive doping would lead to Al-ion doping in the lithium layer, which can block lithium diffusion and affect the rate property. Specifically, LiNi0.47Al0.03Mn0.5O2 shows a much higher capacity retention compared to LiNi0.5Mn0.5O2 both at 25 °C (78.5 vs. 68.8% at 0.2 C) and 60 °C (70.8 vs. 69.0% at 0.2 C). Moreover, Al-doping can retard the voltage drop during the discharge-charge state, with the discharge voltage for LiNi0.5-zAlzMn0.5O2 (z = 0.00, 0.03, 0.05, 0.08) decreasing slowly with increasing Al content.

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Funding

This work was supported by the Natural Science Foundation of China (U1507106 and U1507114), the Natural Science Foundation of Qinghai Province (2016-GX-101), the Hunan Provincial Science and Technology Plan Project (Nos. 2016TP1007 and 2017TP1001), the Hunan Provincial Science and Technology Plan Project (No. 2016TP1007).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Chemical Power Sources, Central South University, Changsha, Hunan, 410083, People’s Republic of China

    Guofeng Jia, Suqin Liu & Zhen He

  2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, Qinghai, 810008, People’s Republic of China

    Guofeng Jia, Guowei Yang, Faqiang Li, Kang Wu & Xuehui Shangguan

  3. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining, 810008, People’s Republic of China

    Guofeng Jia, Guowei Yang, Faqiang Li, Kang Wu & Xuehui Shangguan

  4. Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Changsha, Hunan, 410083, People’s Republic of China

    Suqin Liu & Zhen He

  5. University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Guowei Yang, Kang Wu & Xuehui Shangguan

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  1. Guofeng Jia
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Correspondence to Suqin Liu.

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Jia, G., Liu, S., Yang, G. et al. The multiple effects of Al-doping on the structure and electrochemical performance of LiNi0.5Mn0.5O2 as cathode material at high voltage. Ionics 24, 3705–3715 (2018). https://doi.org/10.1007/s11581-018-2553-z

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