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Cobalt oxide thin films for high capacity and stable Li-ion battery anode

Publication Type : Journal Article

Thematic Areas : Nanosciences and Molecular Medicine

Publisher : Journal of Solid State Electrochemistry

Source : Journal of Solid State Electrochemistry, Springer New York LLC, Volume 23, Number 2, p.513-518 (2019)

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Keywords : Anodes, Co3O4, Cobalt compounds, Crystal impurities, crystal structure, Cycling stability, DC sputtering, Electron microscopy analysis, Growth kinetics, High resolution image, Ions, Lithium compounds, Lithium ion diffusion, Lithium-ion batteries, Oxide films, Photoelectron spectroscopy, Primary particles, Rate capabilities, Reactive sputtering, Thin film lithium ion batteries, Thin films

Campus : Kochi

School : Center for Nanosciences

Center : Amrita Center for Nanosciences and Molecular Medicine Move, Nanosciences

Department : Nanosciences, Nanosciences and Molecular Medicine

Year : 2019

Abstract : Here, we report reactive DC-sputter deposited Co3O4 thin films as a promising and stable Li-ion battery anode. Thin films were deposited on stainless steel by reactive sputtering of cobalt target in O2 atmosphere. X-ray diffraction and X-ray photo electron spectroscopy confirm the formation of Co3O4 crystal structure and absence of other impurities. The electron microscopy analysis shows a columnar growth morphology of the thin films while high resolution images reveal that the film is composed of ultra-small nanoparticles of average size of 5 nm. Fabricated half cells upon cycling between 3.0 and 0.01 V exhibit a stable capacity of 1125 mAh/g at a current density of 1 A/g for 100 cycles. Moreover, the electrode exhibited excellent rate capability and stability at higher rates; at current density of 10 A/g, a capacity close to 1000 mAh/g was observed. The excellent cycling stability of the cell was further confirmed by cycling at a high rate of 25 A/g (28 C) wherein the same was able to retain a capacity of 330 mAh/g even at the end of 1800 cycles. This enhanced performance could be related to the formation of 5-nm primary particles and columnar growth morphology, capable of reducing the lithium ion diffusion lengths and thus offered better kinetics even at high rates. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.

Cite this Research Publication : A. P. Varghese, Shantikumar V Nair, and Dr. Dhamodaran Santhanagopalan, “Cobalt Oxide Thin Films for High Capacity and Stable Li-ion Battery Anode”, Journal of Solid State Electrochemistry, vol. 23, pp. 513-518, 2019.

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