Dissolution behavior of Co-coated NiO cathode in molten (Li0.62K0.38)2CO3 eutectics

The dissolution behavior of the NiO-CoO electrodes in molten (Li0.62K0.38)2CO3 eutectics as a function of Co content was investigated under the standard cathodic gas composition at 650 DGC. In order to prepare NiO-CoO electrodes, Co was deposited on the porous Ni electrode using galvanostatic pulse...

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Bibliographic Details
Published in:Journal of power sources 2004-10, Vol.137 (1), p.62-70
Main Authors: RYU, B. H, HAN, J, YOON, S. P, NAM, S. W, LIM, T.-H, HONG, S.-A, KIM, K. B
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Fuel cells
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Summary:The dissolution behavior of the NiO-CoO electrodes in molten (Li0.62K0.38)2CO3 eutectics as a function of Co content was investigated under the standard cathodic gas composition at 650 DGC. In order to prepare NiO-CoO electrodes, Co was deposited on the porous Ni electrode using galvanostatic pulse plating technique followed by the oxidation process. Compared to the pure NiO electrode, NiO-CoO electrodes showed low Ni solubility in molten (Li0.62K0.38)2CO3 eutectics. Solubility of NiO-CoO electrodes depended on the partial pressure of carbon dioxide (PcO2) and the Ni solubility increased with Pco2. On the other hand, the Ni solubility was not affected by the partial pressure of oxygen (PO2). The XRD analysis after the dissolution experiment, showed that the Ni solubility decreased with increase of the amount of lithium incorporated in the electrodes and that the lithium incorporation was promoted by the formation of NiO-CoO solid solution. The results obtained in the present study suggested that NiO-CoO solid solution could effectively suppress the NiO dissolution in the molten (Li0.62K0.38)2CO3 eutectics.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2004.05.037