Abstract
Cadmium ferrite, CdFe2O4, is synthesized by urea combustion method followed by calcination at 900°C and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and selected area electron diffraction (SAED) techniques. The Li-storage and cycling behaviour are examined by galvanostatic cycling, cyclic voltammetry (CV) and impedance spectroscopy in the voltage range, 0·005–3·0 V vs Li at room temperature. CdFe2O4 shows a first cycle reversible capacity of 870 (± 10) mAhg−1 at 0·07C-rate, but the capacity degrades at 4 mAhg−1 per cycle and retains only 680 (± 10) mAhg−1 after 50 cycles. Heat-treated electrode of CdFe2O4 (300°C; 12 h, Ar) shows a significantly improved cycling performance under the above cycling conditions and a stable capacity of 810 (± 10) mAhg−1 corresponding to 8·7 moles of Li per mole of CdFe2O4 (vs theoretical, 9·0 moles of Li) is maintained up to 60 cycles, with a coulombic efficiency, 96–98%. Rate capability of heat-treated CdFe2O4 is also good: reversible capacities of 650 (± 10) and 450 (± 10) mAhg−1 at 0·5 C and 1·4 C (1 C = 840 mAg−1) are observed, respectively. The reasons for the improved cycling performance are discussed. From the CV data in 2–15 cycles, the average discharge potential is measured to be ∼0·9 V, whereas the charge potential is ∼2·1 V. Based on the galvanostatic and CV data, ex situ-XRD, -TEM and -SAED studies, a reaction mechanism is proposed. The impedance parameters as a function of voltage during the 1st cycle have been evaluated and interpreted.
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Dedicated to Prof. C N R Rao on his 75th birthday, and his contributions to science for the past 56 years
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Sharma, Y., Sharma, N., Subba Rao, G.V. et al. Li-storage and cycling properties of spinel, CdFe2O4, as an anode for lithium ion batteries. Bull Mater Sci 32, 295–304 (2009). https://doi.org/10.1007/s12034-009-0043-7
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DOI: https://doi.org/10.1007/s12034-009-0043-7