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Engineering of Graphene Layer Orientation to Attain High Rate Capability and Anisotropic Properties in Li-Ion Battery Electrodes

DSpace at IIT Bombay

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Title Engineering of Graphene Layer Orientation to Attain High Rate Capability and Anisotropic Properties in Li-Ion Battery Electrodes
 
Creator MUKHOPADHYAY, A
GUO, F
TOKRANOV, A
XIAO, XC
HURT, RH
SHELDON, BW
 
Subject vertically aligned graphene layers
Li-ion battery
rate capability
intercalation induced stress
RECHARGEABLE LITHIUM BATTERIES
GRAPHITE-ELECTRODES
DIFFUSION-COEFFICIENT
FILM FORMATION
CARBON-FIBER
THIN-FILMS
INTERCALATION
STRESS
MECHANISMS
LITHIATION
 
Description Novel carbon films with different graphene layer orientations are investigated as electrode materials for Li-ion batteries. It is demonstrated that engineering the crystallographic orientation with graphene layers oriented perpendicular to the surface substantially alters stress evolution during Li insertion. With this crystallographic orientation the intercalating/de-intercalating Li-ions also have direct access to the graphene interlayer spaces, resulting in higher capacity at faster electrochemical cycling, compared to carbon films with graphene layers parallel to the film surface. Electrodes with perpendicular alignment are prepared by supramolecular synthesis using either spin coating or bar coating of chromonic liquid crystal precursors into precursor organic films followed by in situ carbonization. These materials are compared with in situ stress measurements during lithiation/delithiation cycles, and the bar-coated films exhibit a highly anisotropic stress which is consistent with long-range alignment of the graphene layers. In contrast, the in-plane stresses in the spin-coated films are isotropic, which is consistent with the presence of randomly oriented domains (still with graphene layers oriented perpendicular to the surface). Overall, the use of thin film graphitic materials with controlled crystallographic orientations provides a valuable platform for investigating the impact of graphene structure on the properties of Li-ion battery electrode materials.
 
Publisher WILEY-V C H VERLAG GMBH
 
Date 2014-10-15T15:12:54Z
2014-10-15T15:12:54Z
2013
 
Type Article
 
Identifier ADVANCED FUNCTIONAL MATERIALS, 23(19)2397-2404
http://dx.doi.org/10.1002/adfm.201201128
http://dspace.library.iitb.ac.in/jspui/handle/100/15122
 
Language en