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Chemical intercalation of graphite using chromium trioxide for the anode application in rechargeable sodium-ion batteries

Authors:

J.N. Kanagaratnam,

National Institute of Fundamental Studies, LK
About J.N.
National Center for Advanced Battery Research
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T.H.N.G. Amaraweera,

Uva Wellassa University, LK
About T.H.N.G.
Department of Applied Earth Sciences
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N.W.B. Balasooriya,

University of Peradeniya, LK
About N.W.B.
Department of Geology
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H.W.M.A.C. Wijayasinghe

National Institute of Fundamental Studies, LK
About H.W.M.A.C.
National Center for Advanced Battery Research
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Abstract

Among naturally occurring graphite, Sri Lankan vein graphite (SLVG) is well known for its high initial purity in the range of 95 - 99% carbon, high crystallinity, extensive mineralization, and mode of occurrences. Due to its distinctive properties, Sri Lankan vein graphite has been proved to be a promising anode material for rechargeable Lithium-ion battery (LIB) applications. With the increasing demand for rechargeable energy sources, the supply of Lithium-ion batteries (LIB) could be hindered by the limited lithium reserves. Therefore, alternatives for Lithium in LIBs are being explored. In this context Sodium-ion batteries (SIB) have attracted much attention during the recent past. This study focused on studying the intercalation and deintercalation of Na+ ions into the domain of Graphite Intercalation Compound (GIC), fabricated from natural vein graphite, for the anode application of rechargeable SIBs. Graphite Intercalation Compounds with CrO3 (GIC-CO) were successfully synthesized using SLVG as the starting material. The synthesized GIC-CO exhibited an interlayer spacing of 4.02 Å which is regarded to be suitable for Na + ion intercalation. The anode material fabricated from GIC-CO showed a capacity of 26.9 mA h g-1 which is higher than that of pristine graphite (13 mA h g-1). This shows the potential of utilizing this GIC for anode applications in SIBs. The anode could be improved by optimizing the molar ratios of CrO 3 and the reaction time to obtain expanded graphite making it appropriate for high-capacity SIB application


How to Cite: Kanagaratnam, J. N., Amaraweera, T. H. N. G., Balasooriya, N. W. B., & Wijayasinghe, H. W. M. A. C. (2022). Chemical intercalation of graphite using chromium trioxide for the anode application in rechargeable sodium-ion batteries. Ceylon Journal of Science, 51(1), 21–27. DOI: http://doi.org/10.4038/cjs.v51i1.7975
Published on 14 Mar 2022.
Peer Reviewed

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