Abstract
In this work, we have successfully in-situ synthesized Na+ and Co2+ co-doped Li0.9Na0.1Mn1-xCoxPO4/C nanoparticles on the surface of Li2.7Na0.3PO4 self-sacrificing template by the co-precipitation process combined with the hydrothermal method. The crystal lattice structure, crystal appearance and electrochemical parameters are characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), galvanostatic charge and discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). SEM analysis indicates that Li0.9Na0.1Mn0.9Co0.1PO4/C composite shows uniform porous structure and nanosized grain particles. The electrochemical measurements show that the double ions co-doping routine plays a vital influence on the rate capability and electrochemical lithium storage property of LiMnPO4 material. The initial discharge specific capacity of Li0.9Na0.1Mn0.9Co0.1PO4/C reaches 164.3 mAh/g (0.05 C) and 148.0 mAh/g (1 C), respectively. The excellent rate capability is attributed to the synergetic doping effect of Na+ and Co2+ on improving the Li-ion diffusion rate and broadening the Li-ion diffusion channels.
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Acknowledgements
The work was funded by the National Natural Science Fund of China (Nos. 51874079, 51674068), Liaoning Province Ordinary Higher Education Institutions Intercollegiate Cooperation Project (No. 202010), Liaoning Province Education Department Science and Technology Research Project (No. 202006), Scientific Research Fund of Shenyang Medical College (No. 20201006), Science and Technology Fund of Shenyang Medical College (No. 20195076), Supported by the Program for Guangdong Introducing Innovative and Entrepreneurial Teams (No. 2016ZT06G025).
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Zhang, J., Luo, SH., Ren, QX. et al. Preparation and electrochemical performance of Na+ and Co2+ co-doped Li0.9Na0.1Mn1-xCoxPO4/C cathode material for Li-ion battery. Ionics 27, 3251–3257 (2021). https://doi.org/10.1007/s11581-021-04102-0
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DOI: https://doi.org/10.1007/s11581-021-04102-0