Publication Type:

Journal Article

Source:

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

URL:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85057109440&doi=10.1007%2fs10008-018-4158-x&partnerID=40&md5=66e24695e0dd8e4fa75ef23cb5cca957

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

Abstract:

<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>

Notes:

cited By 0; Article in Press

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.