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Role of Voltage Scan Rate on Degradation of Graphite Electrodes Electrochemically Cycled vs. Li/Li+
Published online by Cambridge University Press: 09 January 2012
Abstract
Graphite electrode surface degradation mechanisms and formation of solid electrolyte layers (SEI) at the interface with the electrolyte were studied as a function of the applied voltage and voltage scan rates using in situ optical microscopy. Voltammetry tests were initiated from a peak voltage of 3.00 V during which the voltage was decreased to a constant base potential (0.02 V) using different scan rates of 0.05-5.00 mV/s. Cross-sectional FIB microscopy indicated that graphite surface and subsurface damage -- in the form of loss of material from graphite -- was reduced when dense and continuous deposits of SEI formed at low scan rates (e.g. 0.05 mV/s).Whereas, non-uniform and discontinuous SEI formed at high scan rates (∼ 5.00 mV/s) was unable to alleviate graphite surface damage.
Keywords
- Type
- Research Article
- Information
- MRS Online Proceedings Library (OPL) , Volume 1388: Symposium F – Mobile Energy , 2012 , mrsf11-1388-f12-11
- Copyright
- Copyright © Materials Research Society 2012
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