Publication Type:

Journal Article

Source:

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

URL:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-84897699381&partnerID=40&md5=ce00eabdbbdc72700dcac1abe75f1fdc

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

Abstract:

<p>Camphoric 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.