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Microstructural and electrochemical properties of LiTi y Co 1-y O2 film cathodes prepared by RF sputtering

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Abstract

LiTi y Co 1-y O2 (y = 0, 0.02, 0.05, 0.1) thin films were deposited on metalized Si substrates using RF magnetron sputtering technique. The films were deposited at a substrate temperature of 250 °C with subsequent annealing at 600 °C for 3 h in controlled oxygen environment. The films exhibited predominant (003), (101), and (104) orientations representing single-phase hexagonal structure with R \( \overline{3} \) m space group. Two well-defined Raman peaks observed at 489 and 598 cm−1 corresponding to E g and A1g modes confirm the hexagonal layered structure. The grain size and grain distribution were observed using atomic force microscopy. The cyclic voltammetry studies on Pt//LiTi y Co1-y O2 film cathodes in aqueous region exhibited perfect redox peaks at expected potentials. The Pt//LiTi0.02Co0.98O2 film cathode exhibited better discharge capacity of about 65 μA h cm−2 μm−1 with good cycling stability compared to pure Pt//LiCoO2. The electrochemical impedance analysis revealed a lower charge transfer resistance in Ti doped LiCoO2 film cathode, resulting better discharge capacity.

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Acknowledgments

One of the authors, Mr. K. Sivajee Ganesh, would like to gratefully acknowledge the University Grants Commission (UGC), New Delhi, for awarding UGC – BSR fellowship in sciences for meritorious students

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Authors and Affiliations

  1. Thin Films Laboratory, Department of Physics, Sri Venkateswara University, Tirupati, 517 502, India

    K. Sivajee Ganesh, B. Purusottam Reddy, P. Jeevan Kumar, K. Jayanthbabu, P. Rosaiah & O. M. Hussain

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  1. K. Sivajee Ganesh
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  2. B. Purusottam Reddy
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  3. P. Jeevan Kumar
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  4. K. Jayanthbabu
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  5. P. Rosaiah
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  6. O. M. Hussain
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Correspondence to O. M. Hussain.

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Sivajee Ganesh, K., Purusottam Reddy, B., Jeevan Kumar, P. et al. Microstructural and electrochemical properties of LiTi y Co 1-y O2 film cathodes prepared by RF sputtering. J Solid State Electrochem 19, 3621–3627 (2015). https://doi.org/10.1007/s10008-015-2963-z

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  • DOI: https://doi.org/10.1007/s10008-015-2963-z

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