Publication Type:

Journal Article


Journal of Solid State Electrochemistry, Springer New York LLC (2018)



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


<p>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&nbsp;nm. Fabricated half cells upon cycling between 3.0 and 0.01&nbsp;V exhibit a stable capacity of 1125&nbsp;mAh/g at a current density of 1&nbsp;A/g for 100&nbsp;cycles. Moreover, the electrode exhibited excellent rate capability and stability at higher rates; at current density of 10&nbsp;A/g, a capacity close to 1000&nbsp;mAh/g was observed. The excellent cycling stability of the cell was further confirmed by cycling at a high rate of 25&nbsp;A/g (28&nbsp;C) wherein the same was able to retain a capacity of 330&nbsp;mAh/g even at the end of 1800&nbsp;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.</p>


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Cite this Research Publication

A. P. Varghese, Nair, S., and Santhanagopalan, D., “Cobalt oxide thin films for high capacity and stable Li-ion battery anode”, Journal of Solid State Electrochemistry, 2018.