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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

Sandeep Bhattacharya ,
A. Reza Riahi  and
Ahmet T. Alpas
Sandeep Bhattacharya
Affiliation:
Department of Mechanical, Automotive and Materials Engineering, University of Windsor, 401 Sunset Avenue, Windsor, Ontario, Canada N9B 3P4.
A. Reza Riahi
Affiliation:
Department of Mechanical, Automotive and Materials Engineering, University of Windsor, 401 Sunset Avenue, Windsor, Ontario, Canada N9B 3P4.
Ahmet T. Alpas
Affiliation:
Department of Mechanical, Automotive and Materials Engineering, University of Windsor, 401 Sunset Avenue, Windsor, Ontario, Canada N9B 3P4.
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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

Cion beam analysismicrostructure
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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References

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