Mixed oxides Ca2Fe2O5 and Ca2Co2O5 as anode materials for Li-ion batteries

Sharma, N. ; Shaju, K. M. ; Subba Rao, G. V. ; Chowdari, B. V. R. (2004) Mixed oxides Ca2Fe2O5 and Ca2Co2O5 as anode materials for Li-ion batteries Electrochimica Acta, 49 (7). pp. 1035-1043. ISSN 0013-4686

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.electacta.2003.10.014

Abstract

The electrochemical performance of mixed oxides, Ca2Fe2O5 and Ca2Co2O5 for use in Li-ion batteries was studied with Li as the counter electrode. The compounds were prepared and characterized by X-ray diffraction and SEM. Ca2Fe2O5 showed a reversible capacity of 226 mAh/g at the 14th cycle and retained 183 mAh/g at the end of 50 cycles at 60 mA/g in the voltage window 0.005-2.5 V. A reversible capacity in the range, 365-380 mAh/g, which is stable up to 50 charge-discharge cycles is exhibited by Ca2Co2O5 in the voltage window, 0.005-3.0 V and at 60 mA/g. This corresponds to recycleable moles of Li of 3.9±0.1 (theoretical: 4.0). Significant improvement in the cycling performance and attainable reversible capacity were noted for Ca2Co2O5 on cycling to an upper cut-off voltage of 3.0 V as compared to 2.5 V. Coulombic efficiency for both compounds is >98%. Electrochemical impedance spectroscopy (EIS) data clearly indicate the reversible formation/decomposition of polymeric surface film on the electrode surface of Ca2Co2O5 in the voltage window, 0.005-3.0 V. Cyclic voltammetry results compliment the galvanostatic cycling data.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Ca2Fe2O5; Ca2Co2O5; Anode Material; Li-ion Batteries; EIS
ID Code:51990
Deposited On:02 Aug 2011 08:23
Last Modified:02 Aug 2011 08:23

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