Study of the carbon material electrolyte interface

The formation mechanism of the passivation film on the surface of carbon-based electrodes during the first electroreduction was studied by chronopotentiometry and impedance spectroscopy. Two types of electrolytes are compared: ethylene carbonate-based liquid and poly (ethylene oxide)-based solid sta...

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Bibliographic Details
Published in:Journal of power sources 1997-09, Vol.68 (1), p.110-113
Main Authors: Yazami, R., Deschamps, M., Genies, S., Frison, J.C.
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
Exact sciences and technology
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Summary:The formation mechanism of the passivation film on the surface of carbon-based electrodes during the first electroreduction was studied by chronopotentiometry and impedance spectroscopy. Two types of electrolytes are compared: ethylene carbonate-based liquid and poly (ethylene oxide)-based solid state electrolytes. The differences in stability towards reduction and in mobility of the solvent molecules in these electrolytes suggest two different mechanisms of reduction: (i) decomposition of the solvent in the liquid electrolyte system, and (ii) formation of an immobilized dense layer in the solid electrolyte system. The chemical diffusion coefficient was also determined by impedance spectroscopy at increased amounts of lithium in the carbon electrode. The film formation and the diffusion are correlated.
ISSN:0378-7753
1873-2755
DOI:10.1016/S0378-7753(97)02639-6