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Enhancement of the electrochemical performance of LiNi0.5Mn1.5O4 cathode materials for Li-ion battery by Mo-F co-doping

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Abstract

The pristine LiNi0.5Mn1.5O4 (LNMO) and Mo-F co-doped LiNi0.5Mn1.5O4 spinel materials were prepared via a rheological phase method. The four samples were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). Compared with the pristine LNMO sample, Mo-F co-doped LNMO materials could increase the lattice parameters, reduce particle sizes, and significantly improve the electrochemical performances of LNMO. The doped material exhibited optimum electrochemical properties when the Mo and F doping amounts were 1% and 3%, respectively, denoted as Mo/F-2. The discharge capacity retention of Mo/F-2 is 95.6%, which is higher than the pristine sample (87.7%) after 100 cycles at 1C and room temperature. Furthermore, the discharge-specific capacity of the Mo/F-2 sample reaches 113.4 mAh g−1 at 5C, while the pristine sample reaches only 61.9 mAh g−1. After CV and EIS analysis, it was found that the Mo-F co-doped LNMO materials had better Li+ diffusion kinetics than the pristine LNMO sample. Thus, Mo-F co-doping is considered an effective modification method for LNMO cathode material.

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Authors and Affiliations

  1. The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemistry and Materials Engineering, Jiangnan University, Wuxi, 214122, Jiangsu, People’s Republic of China

    Yuling Weng & Hailang Zhang

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  1. Yuling Weng
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  2. Hailang Zhang
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YL has done the synthesis experiments, assembled the coin cells and tested the electrochemical properties. HL has designed the research program and evaluation.

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Correspondence to Hailang Zhang.

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Weng, Y., Zhang, H. Enhancement of the electrochemical performance of LiNi0.5Mn1.5O4 cathode materials for Li-ion battery by Mo-F co-doping. Ionics 30, 1885–1895 (2024). https://doi.org/10.1007/s11581-023-05366-4

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