Abstract
Large-scale energy storage required high energy density, high cyclic stabilities during high voltage operation and large specific capacity. In this record Li-rich cathode material LiNi1/3Mn1/3Co1/3O2 was doped with Sm is synthesized using citric acid as a chelating agent. Different amount of Sm was doped to investigate the effect of physical and electrochemical properties. The prepared samples were characterized by thermo gravimetric differential thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), cyclic voltammetry (CV), electrochemical impedance spectra (EIS) and galvanostatic charge–discharge techniques. The powder material was calcined at 800 °C for 10 h which exhibits a polyhedral structure. The electrochemical measurements of (LiNi1/3Mn1/3Co1/3−xSmx)O2 cathode materials possess the best performance, especially at a high rate. The initial discharge capacity of 264.1 mA h−1 at 0.1 C has reduced only 10.57% after the 100th cycle. Electrochemical impedance spectrum indicates that, LiNi1/3Mn1/3Co1/3−xSmxO2 electrode has lower resistance during cycling. Such an improvement is associated with the doping of Sm enhancing the ability of Li diffusion in LiNi1/3Mn1/3Co1/3−x SmxO2 components. Results indicate that the structure of dopant samples have exhibited enhanced electrochemical performance with higher capacity and excellent cyclic capacity compared with the parent component.
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Acknowledgements
The first author would like to thank the Department of Science and Technology (DST), New Delhi, for providing financial assistance under the DST-INSPIRE Program. The authors also thank the DST – PURSE–II and MHRD – RUSA – 2.0, New Delhi for providing financial assistance to carry out this research work.
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Kalaiselvi, K., Paruthimal Kalaignan, G. Structure and electrochemical performance of Samarium substituted LiNi1/3Mn1/3Co1/3O2 cathode materials for rechargeable lithium-ion batteries. J Mater Sci: Mater Electron 29, 20703–20709 (2018). https://doi.org/10.1007/s10854-018-0210-y
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DOI: https://doi.org/10.1007/s10854-018-0210-y