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Insight into the mechanical integrity of few-layers graphene upon lithiation/delithiation via in situ monitoring of stress development

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Title Insight into the mechanical integrity of few-layers graphene upon lithiation/delithiation via in situ monitoring of stress development
 
Creator SONIA, FJ
ANANTHOJU, B
JANGID, MK
KALI, R
ASLAM, M
MUKHOPADHYAY, A
 
Subject LI-ION BATTERIES
LITHIUM-ION
INTERCALATION COMPOUNDS
GRAPHITE-ELECTRODES
SINGLE-LAYER
LITHIATION
FILMS
DEFORMATION
EVOLUTION
CAPACITY
 
Description By monitoring the stress developments in situ during lithiation/delithiation of few layers graphene films, we report here for the first time an interesting observation of stress release/reversal just within the potential ranges corresponding to the co-existences of pristine graphene, dilute stage I and stage IV Li-graphite intercalation compounds (Li-GICs). This, along with supporting observations related to the presence of cracks in the graphene films upon electrochemical cycling and enhanced I-D/I-G ratio in Raman spectra recorded upon cycling primarily within the potential regimes corresponding to the stress release/reversal, indicate possible occurrences of mechanical/structural degradation mainly during the initial stages of lithiation and later stages of delithiation. This observation is being supported by a geometric model which estimates the strains induced in the individual graphene layers at the interfaces between the different Li-GICs at the various stages of lithia don; and as a function of distance from the current collector. On a slightly different note, the experimentally recorded magnitude of net lithiation induced reversible in-plane stress development was similar to 11 GPa. This is in fair agreement with that expected based on the theoretical dilation of similar to 1% along the graphene layers upon lithiation as per the classical Li-intercalation mechanism (i.e., up to formation of LiC6). (c) 2015 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2016-01-14T13:11:28Z
2016-01-14T13:11:28Z
2015
 
Type Article
 
Identifier CARBON, 88,206-214
0008-6223
1873-3891
http://dx.doi.org/10.1016/j.carbon.2015.02.078
http://dspace.library.iitb.ac.in/jspui/handle/100/17582
 
Language en