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Title: Mixed oxides Ca2Fe2O5 and Ca 2Co2O5 as anode materials for Li-ion batteries
Authors: Sharma, N. 
Shaju, K.M. 
Subba Rao, G.V. 
Chowdari, B.V.R. 
Keywords: Anode material
Ca2Co 2O5
Li-ion batteries
Issue Date: 15-Mar-2004
Citation: Sharma, N., Shaju, K.M., Subba Rao, G.V., Chowdari, B.V.R. (2004-03-15). Mixed oxides Ca2Fe2O5 and Ca 2Co2O5 as anode materials for Li-ion batteries. Electrochimica Acta 49 (7) : 1035-1043. ScholarBank@NUS Repository.
Abstract: The electrochemical performance of mixed oxides, Ca2Fe 2O5 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. Ca 2Fe2O5 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 Ca2Co2O 5 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. © 2003 Published by elsevier Ltd.
Source Title: Electrochimica Acta
ISSN: 00134686
DOI: 10.1016/j.electacta.2003.10.014
Appears in Collections:Staff Publications

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