Journal of Applied Electrochemistry

, Volume 47, Issue 11, pp 1189–1201 | Cite as

Improvement in the electrochemical performance of a LiNi0.5Mn0.5O2 cathode material at high voltage

  • Faqiang Li
  • Guowei Yang
  • Guofeng Jia
  • Xuehui Shangguan
  • Qin Zhuge
  • Bin Bai
Research Article
  • 182 Downloads
Part of the following topical collections:
  1. Batteries

Abstract

Layered LiNi0.5−x Ca x Mn0.5O2 (0 ≤ x ≤ 0.2) cathode materials were prepared through a combination of co-precipitation and a solid-state method. The prepared cathode materials were investigated in detail by X-ray diffraction (XRD), Rietveld refinement, inductively coupled plasma, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), cyclic voltammetry and charge–discharge measurements. The results of XRD, Rietveld refinement, XPS and SEM measurements revealed that Ca-doping can increase the stability of the structure and lower the amount of Li/Ni cation mixing. Furthermore, Ca-doping was not observed to affect the morphology or oxidation states of the LiNi0.5Mn0.5O2. The electrochemical measurements showed that the pristine LiNi0.5Mn0.5O2 material has the lowest discharge capacity of 88.6 mAh g−1 between 3 and 4.5 V at a constant density of 0.2 C, which was improved 38% by doping with 3 mol% of Ca. Additionally, the capacity retention of the 3 mol% Ca-doping is 20% higher than that of the pristine LiNi0.5Mn0.5O2 material in the voltage range of 3.0–4.5 V. Furthermore, we investigated the source of the enhancement of the electrochemical properties from Ca-doping. The improvement may be attributed to increased structural stability, lowered Li/Ni cation mixing, decreased polarization, reduced migration resistance and faster lithium-ion diffusion.

Graphical Abstract

Keywords

Ca-doping LiNi0.5Mn0.5O2 cathode material Lithium-ion batteries Co-precipitation and solid-state method 

Notes

Acknowledgements

This work was supported by the Natural Science Foundation of China (U1507106 and U1507114), the Natural Science Foundation of Qinghai Province (2015-ZJ-935Q) and the Key Plan Research and Transformation of Qinghai Province (2016-GX-101).

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Copyright information

© Springer Science+Business Media B.V. 2017

Authors and Affiliations

  • Faqiang Li
    • 1
    • 3
    • 4
  • Guowei Yang
    • 1
    • 2
    • 3
  • Guofeng Jia
    • 1
    • 3
  • Xuehui Shangguan
    • 1
    • 2
    • 3
  • Qin Zhuge
    • 1
    • 3
  • Bin Bai
    • 4
  1. 1.Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt LakesChinese Academy of SciencesXiningPeople’s Republic of China
  2. 2.University of Chinese Academy of SciencesBeijingPeople’s Republic of China
  3. 3.Key Laboratory of Salt Lake Resources Chemistry of Qinghai ProvinceXiningPeople’s Republic of China
  4. 4.Qinghai Research Center of Low-temperature Lithium-ion Battery Technology EngineeringQinghai Green Grass New Energy Technology Co. Ltd.XiningPeople’s Republic of China

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