Abstract
In the present work the thermal behavior of Li–Co-CA (citric acid) gels obtained by sol–gel method in aqueous media was studied. As reagents lithium and cobalt nitrates or acetates were used. The ultra-violet visible spectroscopic investigations indicate the formation of complex coordination gels in which Co(II) ion has an octahedral geometry. The Fourier-Transform Infrared spectroscopy suggests that the carboxyl groups provided by the citric acid act as bridging ligands for both studied gels. The obtained gels were analyzed by thermogravimetric and differential thermal analysis coupled with evolved gases analysis. A stepwise thermal decomposition of both types of gels was noticed with the evolution of different type of gases. These binary gels were comparatively investigated with the corresponding mono-metal-citric acid gels. The decomposition of both binary studied gels takes place up to 400 °C. Based on the thermal behavior of the complex gels, their annealing process was established. The binary gels thermally treated at 700 °C lead to single phase of lithium cobalt oxide (LiCoO2) powders.
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Acknowledgements
The support of the EU (ERDF) and Romanian Government that allowed for acquisition of the research infrastructure (XRD) under POS-CCE O 2.2.1 project INFRANANOCHEM—Nr. 19/01.03.2009, is gratefully acknowledged. Barbara Malic acknowledges the financial support of the Slovenian Research Agency (P2-0105). Ms. Jena Cilenšek is acknowledged for performing the thermal analyses of the studied materials. The authors thank Dr. Cornel Munteanu from “Ilie Murgulescu” Institute of Physical Chemistry for the SEM images.
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Predoana, L., Jitianu, A., Preda, S. et al. Thermal behavior of Li–Co-citric acid water-based gels as precursors for LiCoO2 powders. J Therm Anal Calorim 119, 145–153 (2015). https://doi.org/10.1007/s10973-014-4178-4
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DOI: https://doi.org/10.1007/s10973-014-4178-4