pp 1–11 | Cite as

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

  • Guofeng Jia
  • Suqin Liu
  • Guowei Yang
  • Faqiang Li
  • Kang Wu
  • Zhen He
  • Xuehui Shangguan
Original Paper


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-zAl z Mn0.5O2 (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-zAl z Mn0.5O2 (z = 0.00, 0.03, 0.05, 0.08) decreasing slowly with increasing Al content.


Lithium-ion battery LiNi0.5Mn0.5O2 cathode material Al-doping High-voltage Structural changes 


Funding information

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).

Supplementary material

11581_2018_2553_MOESM1_ESM.docx (2.2 mb)
ESM 1 (DOCX 2235 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Guofeng Jia
    • 1
    • 2
    • 3
  • Suqin Liu
    • 1
    • 4
  • Guowei Yang
    • 2
    • 3
    • 5
  • Faqiang Li
    • 2
    • 3
  • Kang Wu
    • 2
    • 3
    • 5
  • Zhen He
    • 1
    • 4
  • Xuehui Shangguan
    • 2
    • 3
    • 5
  1. 1.College of Chemistry and Chemical Engineering, Hunan Provincial Key Laboratory of Chemical Power SourcesCentral South UniversityChangshaPeople’s Republic of China
  2. 2.Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake ResourcesQinghai Institute of Salt Lakes, Chinese Academy of SciencesXiningPeople’s Republic of China
  3. 3.Key Laboratory of Salt Lake Resources Chemistry of Qinghai ProvinceXiningPeople’s Republic of China
  4. 4.Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese ResourcesChangshaPeople’s Republic of China
  5. 5.University of Chinese Academy of SciencesBeijingPeople’s Republic of China

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