Hysteresis during Lithium Insertion in Hydrogen-Containing Carbons

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DOIResolve DOI: http://doi.org/10.1149/1.1836972
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TypeArticle
Journal titleJournal of The Electrochemical Society
Volume143
Issue7
Pages21372145; # of pages: 9
Subjectabsorption; additives; bonds (chemical); carbon; electrochemistry; energy storage; hydrogen; hysteresis; lithium
AbstractWe studied lithium insertion in hydrogen-containing carbons heated at temperatures near 700�C. High capacities with large hysteresis (lithium insertion into these carbons at nearly 0 V and removal at nearly 1 V) were shown to be proportional to the hydrogen content of the samples. It is believed that the lithium atoms may bind on hydrogen-terminated edges of hexagonal carbon fragments, causing a change in the bond from sp2 to sp3. We have carefully studied the electrochemical insertion of lithium in hydrogen-containing carbons using a variety of charge-discharge rates and cycling temperatures. These measurements allow the hysteresis to be quantified. A simple model, which treats the bonding change as an activated process, is used to model the hysteresis in the cells qualitatively.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Institute for Microstructural Sciences
Peer reviewedNo
NPARC number12337953
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Record identifier116b9201-50df-49be-8a2b-6e20808cd83c
Record created2009-09-10
Record modified2016-05-09
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