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The Origin of Stress in the Solid Electrolyte Interphase on Carbon Electrodes for Li Ion Batteries

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Title The Origin of Stress in the Solid Electrolyte Interphase on Carbon Electrodes for Li Ion Batteries
 
Creator TOKRANOV, A
SHELDON, BW
LU, P
XIAO, X
MUKHOPADHYAY, A
 
Subject GRAPHITE NEGATIVE ELECTRODE
SURFACE-FILM FORMATION
THIN-FILMS
LITHIUM
ANODES
CELLS
SEI
MODEL
MECHANISMS
CAPABILITY
 
Description This paper focuses on stress generation during the initial stages of the Solid Electrolyte Interphase (SEI) formation on graphite electrodes. C-axis oriented graphitic carbon, grown via chemical vapor deposition (CVD), is used as a model system for this study, to enable reliable characterization using Secondary Ion Mass Spectroscopy (SIMS) and X-ray Photo-electron Spectroscopy (XPS). The SET formation was also probed by recording the stress development in-situ during constant voltage holds above the lithium intercalation threshold, using a Multi-beam Optical Stress Sensor (MOSS). This provides direct correlations between the potential, current and stress. SIMS and XPS analysis of the surface chemistry of the cycled samples show high carbon content near the surface. Cross-sectional TEM indicates that these surface layers are predominantly amorphous. Based on the evidence and analysis, the stress in this amorphous layer is believed to play an important role in stabilizing the inorganic SET layer. An understanding of this interlayer can be used to design a more mechanically stable SET layer, and is also potentially relevant to,other electrode materials which show much higher volume expansions. (C) 2013 The Electrochemical Society. All rights reserved.
 
Publisher ELECTROCHEMICAL SOC INC
 
Date 2014-12-29T04:38:56Z
2014-12-29T04:38:56Z
2014
 
Type Article
 
Identifier JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 161(1)A58-A65
0013-4651
1945-7111
http://dx.doi.org/10.1149/2.009401jes
http://dspace.library.iitb.ac.in/jspui/handle/100/17097
 
Language English