Abstract
In this article, we report the synthesis of 1,2-dimethyl-3-(3-hydroxypropyl) imidazolium dicyanamide ionic liquid and its used as a reaction medium for low-temperature synthesis of triclinic LiVPO4F electrode material. Structural and morphological features of LiVPO4F were characterized using X-ray diffraction and scanning electron microscopy techniques. The electrochemical studies have been investigated using cyclic voltammetry, galvanostatic charge/discharge studies, and electrochemical impedance spectroscopic techniques. The ionothermally obtained LiVPO4F is modified to LiVPO4F/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPO4F/f-graphene composite electrode exhibited a specific capacity more than 84 % with good reversible de-intercalation/intercalation of Li-ions. This article also provides the comparative electrochemical performances of LiVPO4F/f-graphene composite, LiVPO4F/carbon, and LiVPO4F/graphene composite electrodes in a nonaqueous rechargeable Li-ion battery system.
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Acknowledgments
The authors would like to acknowledge the financial support from the science and engineering Research board, Department of Science and Technology, New Delhi. We thank Sri. A. V. S. Murthy, Honorary Secretary, Rashtreeya Sikshana Samithi Trust and Dr. Snehalata G Nadiger, Principal, NMKRV College for women, Bangalore, for their continuous support and encouragement. We also thank Prof. N. Manu Chakravarthy for his valuable suggestions in writing of this manuscript.
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Rangaswamy, P., Shetty, V.R., Suresh, G.S. et al. Enhanced electrochemical performance of LiVPO4F/f-graphene composite electrode prepared via ionothermal process. J Appl Electrochem 47, 1–12 (2017). https://doi.org/10.1007/s10800-016-1007-4
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DOI: https://doi.org/10.1007/s10800-016-1007-4