Journal article
Experimental and Theoretical Investigation of Solid-Electrolyte-Interphase Formation Mechanisms on Glassy Carbon
Journal of the Electrochemical Society, v 159(11), pp A1775-A1785
01 Jan 2012
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Abstract
To determine the passivation mechanism of the Solid-Electrolyte-Interphase (SEI), glassy carbon was held at potentials from 0.1 to 0.9 V vs. lithium for different lengths of time. The resulting SEI was characterized electrochemically, using steady-state and transient ferrocene kinetics. Experiments were interpreted with macroscopic models for film formation and through-film ferrocenium reduction. Formation experiments demonstrate that growth is limited by transport of a charged species, but that electron migration through the SEI cannot be the limiting process. Ferrocene experiments show that both through-film transport and kinetics decrease with more passivation time. Comparison with models suggests that a decreasing porosity is a more likely explanation than either an increasing thickness or a decreased area of active sites. For the same amount of formation charge, the SEI formed at lower potential passivates the electrode more effectively. At long times and low potentials, the SEI is unstable. A passivation mechanism in which soluble intermediates of electrolyte reduction diffuse away from the electrode is proposed. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.025211jes] All rights reserved.
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Details
- Title
- Experimental and Theoretical Investigation of Solid-Electrolyte-Interphase Formation Mechanisms on Glassy Carbon
- Creators
- Maureen Tang - University of California, BerkeleySida Lu - Lawrence Berkeley National LaboratoryJohn Newman - University of California, Berkeley
- Publication Details
- Journal of the Electrochemical Society, v 159(11), pp A1775-A1785
- Publisher
- Electrochemical Soc Inc
- Number of pages
- 11
- Grant note
- DE-AC02-05CH11231 / Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000309107200004
- Scopus ID
- 2-s2.0-84875518576
- Other Identifier
- 991019299003804721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Electrochemistry
- Materials Science, Coatings & Films