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Lithium-ion storage performance of camphoric carbon wrapped NiS nano/micro-hybrids

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : RSC Advances

Source : RSC Advances, Volume 4, Number 23, p.11673-11679 (2014)

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Keywords : Carbon, Charge discharge curves, Diffusion-controlled process, Electric discharges, Electrochemical parameters, Electrodes, Functional materials, High surface area electrodes, Powders, Processing technique, Relative contribution, Storage performance, Thin-film electrode

Campus : Kochi

School : Center for Nanosciences

Center : Nanosciences

Department : Nanosciences and Molecular Medicine

Year : 2014

Abstract : pCamphoric carbon wrapped NiS powders have been profitably exploited to fabricate high surface area electrodes for Li storage. The NiS morphology showed a network of interconnected nanoscale units with rod like profiles which terminated into needle-like apexes spanning diameters of about 50-80 nm. These particles were pyrolyzed using a camphoric solution to form a carbon sheath wrapping. These carbon functionalized NiS powders were processed into high-surface-area cathodes for a fully functional coin cell unit. A detailed study was performed to elucidate the effect of carbon content on the performance of these coin cells. BET surface area analysis revealed that these carbon sheathed NiS could exhibit a high surface area of 32 m2 g -1 compared to pristine powders which exhibited surface area values of 20 m2 g-1. From the analysis of relevant electrochemical parameters, an intrinsic correlation between the specific capacity, internal resistance and temperature has been deduced. Relative contributions of capacitive and diffusion-controlled processes underlying these thin-film electrodes have been mathematically modeled. These thin-film electrodes exhibited specific capacity values as high as 500 mA h g-1 as determined from charge discharge curves. The present study shows that this functional material can provide the advantages of simple processing technique, low cost, and scalability. © The Royal Society of Chemistry 2014./p

Cite this Research Publication : S. T. Sebastian, Jagan, R. S., Rajagoplan, R., Paravannoor, A., Menon, L. V., Subramanian, K. R. V., Nair, S. V., and Balakrishnan, A., “Lithium-ion storage performance of camphoric carbon wrapped NiS nano/micro-hybrids”, RSC Advances, vol. 4, pp. 11673-11679, 2014.

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