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Metal-organic chemical vapor-deposited cobalt oxide films as negative electrodes for thin film Li-ion battery

Jena, Anirudha and Munichandraiah, N and Shivashankar, SA (2015) Metal-organic chemical vapor-deposited cobalt oxide films as negative electrodes for thin film Li-ion battery. In: JOURNAL OF POWER SOURCES, 277 . pp. 198-204.

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Official URL: http://dx.doi.org/ 10.1016/j.jpowsour.2014.11.091


In this study, thin films of cobalt oxide (Co3O4) have been grown by the metal-organic chemical vapor deposition (MOCVD) technique on stainless steel substrate at two preferred temperatures (450 degrees C and 500 degrees C), using cobalt acetylacetonate dihydrate as precursor. Spherical as well as columnar microstructures of Co3O4 have been observed under controlled growth conditions. Further investigations reveal these films are phase-pure, well crystallized and carbon-free. High-resolution TEM analysis confirms that each columnar structure is a continuous stack of minute crystals. Comparative study between these Co3O4 films grown at 450 degrees C and 500 degrees C has been carried out for their application as negative electrodes in Li-ion batteries. Our method of electrode fabrication leads to a coating of active material directly on current collector without any use of external additives. A high specific capacity of 1168 micro Ah cm(-2) mu m(-1) has been measured reproducibly for the film deposited at 500 degrees C with columnar morphology. Further, high rate capability is observed when cycled at different current densities. The Co3O4 electrode with columnar structure has a specific capacity 38% higher than the electrode with spherical microstructure (grown at 450 degrees C). Impedance measurements on the Co3O4 electrode grown at 500 degrees C also carried out to study the kinetics of the electrode process. (C) 2014 Published by Elsevier B.V.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords: Thin film; Cobalt oxide; Li ion battery
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Division of Chemical Sciences > Materials Research Centre
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 19 Mar 2015 12:05
Last Modified: 19 Mar 2015 12:05
URI: http://eprints.iisc.ac.in/id/eprint/51027

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