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Effects of Li2TiO3 coating on the structure and the electrochemical properties of LiNi0.5Mn0.5O2 cathode materials at high voltages

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Abstract

To improve the cycle performance, zLi2TiO3@LiNi0.5Mn0.5O2 (z = 0, 1, 3 and 5 mol%) (“@” means “was coated on the surface of”) cathode materials have been successfully prepared via a syn-lithiation strategy. The high-resolution transmission electron microscope (HRTEM) structural analysis results show that Li2TiO3 is evenly coated on the surface of LiNi0.5Mn0.5O2, with the thickness of the coating layer of approximately 10 nm. The electrochemical characterizations of the synthesized zLi2TiO3@LiNi0.5Mn0.5O2 suggest that 1 mol% Li2TiO3@LiNi0.5Mn0.5O2 electrode shows the best electrochemical performance, including the highest capacity and best cycle stability and rate performance. The capacity retention at 25 °C is improved by approximately 23% by the 1 mol% Li2TiO3 coating. The improved cycling performance of LiNi0.5Mn0.5O2 arises from the presence of the Li2TiO3 surface layer, which suppresses the direct contact between the active materials and the electrolytes, enhances the lithium ion diffusion through the electrode/electrolyte interface, expands the BET area, stabilizes the structure and prevents the pulverization of the active materials during repeated charging/discharging. The XPS results showed that Li2TiO3 coating layer could inhibit electrolyte decomposition, and the decomposition of electrolyte on the surface of coating electrode is different from that of LiNi0.5Mn0.5O2 electrode.

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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), and the Science and Technology project of Xining Science and Technology Bureau (2017-G-05).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Chemical Power Sources, and Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, 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, 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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Jia, G., Liu, S., Yang, G. et al. Effects of Li2TiO3 coating on the structure and the electrochemical properties of LiNi0.5Mn0.5O2 cathode materials at high voltages. Ionics 25, 399–410 (2019). https://doi.org/10.1007/s11581-018-2832-8

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