Enhanced electrochemical performance of LiVPO4F/f-graphene composite electrode prepared via ionothermal process
Shetty, Vijeth Rajshekar
Suresh, Gurukar Shivappa
Mahadevan, Kittappa Malavalli
Nagaraju, Doddahalli H.
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
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AbstractAbstract: 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 LiVPOF electrode material. Structural and morphological features of LiVPOF 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 LiVPOF is modified to LiVPOF/f-graphene composite electrode to obtain high specific capacity, better rate performance, and longer cycle life. Even after 250 cycles, the LiVPOF/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 LiVPOF/f-graphene composite, LiVPOF/carbon, and LiVPOF/graphene composite electrodes in a nonaqueous rechargeable Li-ion battery system. Graphical Abstract: [Figure not available: see fulltext.]
CitationRangaswamy P, Shetty VR, Suresh GS, Mahadevan KM, Nagaraju DH (2016) Enhanced electrochemical performance of LiVPO4F/f-graphene composite electrode prepared via ionothermal process. Journal of Applied Electrochemistry. Available: http://dx.doi.org/10.1007/s10800-016-1007-4.