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Synthesis and characterization of Li 2 MnO 3 nanoparticles using sol-gel technique for lithium ion battery

Nanoparticles of Li 2 MnO 3 were fabricated by sol-gel method using precursors of lithium acetate and manganese acetate, and citric acid as chelating agent in the stoichiometric ratio. TGA/DTA measurements of the sample in the regions of 30 °C to 176 °C, 176 °C to 422 °C and 422 °C to 462 °C were ta...

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Published in:Materials science--Poland 2020-06, Vol.38 (2), p.312-319
Main Authors: Chennakrishnan, Sandhiya, Thangamuthu, Venkatachalam, Subramaniyam, Akshaya, Venkatachalam, Viknesh, Venugopal, Manikandan, Marudhan, Raju
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description Nanoparticles of Li 2 MnO 3 were fabricated by sol-gel method using precursors of lithium acetate and manganese acetate, and citric acid as chelating agent in the stoichiometric ratio. TGA/DTA measurements of the sample in the regions of 30 °C to 176 °C, 176 °C to 422 °C and 422 °C to 462 °C were taken to identify the decomposition temperature and weight loss. The XRD analysis of the sample indicates that the synthesized material is monoclinic crystalline in nature and the calculated lattice parameters are 4.928 Å (a), 8.533 Å (b), and 9.604 Å (c). The surface morphology, particle size and elemental analysis of the samples were observed using SEM and EDAX techniques and the results confirmed the agglomeration of nanoparticles and, as expected, Li2MnO3 composition. Half cells of Li 2 MnO 3 were assembled and tested at C/10 rate and the maximum capacity of 27 mAh/g was obtained. Charging and discharging processes that occurred at 3 V and 4 V were clearly observed from the cyclic voltammetric experiments. Stability of the electrodes was confirmed by the perfect reversibility of the anodic and cathodic peak positions observed in the cyclic voltammogram of the sample. The Li 2 MnO 3 nanoparticles exhibit excellent properties and they are suitable for cathode materials in lithium ion batteries.
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