Abstract
Films of LiCoO2 are prepared on metallized silicon substrates using RF-magnetron sputtering technique. The microstructural properties of the films are investigated by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy. The films deposited at a substrate temperature of 250 °C with subsequent annealing at 650 °C exhibited hexagonal layered structure with R \( \overline 3 \) m symmetry. The kinetics of lithium ions in LiCoO2 film cathode host matrix and its cycleability are studied in aqueous Pt//LiCoO2 and nonaqueous Li//LiCoO2 cell. Both the electrochemical cells at same current density of 50 μA cm−2 delivered the same initial discharge capacity of about 60 μA h cm−2 μm−1 with a chemical diffusion coefficient of ca. 10−11 cm2 s−1 for Li+ ions. The capacity fade rates for the Pt//LiCoO2 and Li//LiCoO2 cells, in average are 3.0 and 0.15 % per cycle, respectively, for the first 20 cycles. The Pt//LiCoO2 cell is found to be advantageous for small number of cycles and is cost effective than the Li//LiCoO2 cell.
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Acknowledgments
This work was supported by RCI-DRDO, Hyderabad, India under a major research project. The authors also wish to thank Prof. G. Mohan Rao, IISc, Bangalore for providing the XPS facility and Prof. N. Munichandraiah, IISc, Bangalore for his guidance in carrying out electrochemical analysis.
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Jeevan-Kumar, P., Jayanth-Babu, K., Hussain, O.M. et al. RF-sputtered LiCoO2 thick films: microstructure and electrochemical performance as cathodes in aqueous and nonaqueous microbatteries. Ionics 19, 421–428 (2013). https://doi.org/10.1007/s11581-012-0761-5
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DOI: https://doi.org/10.1007/s11581-012-0761-5