Enhanced electrochemical lithium storage by graphene nanoribbons

Tarun Bhardwaj, Aleks Antic, Barbara Pavan, Veronica Barone, Bradley D. Fahlman

Research output: Contribution to journalArticlepeer-review

271 Scopus citations

Abstract

Herein, we report the electrochemical Li intake capacity of carbonaceous one-dimensional graphene nanoribbons (GNRs) obtained by unzipping pristine multiwalled carbon nanotubes (MWCNTs). We have found that nanotubes with diameters of ∼50 nm present a smaller reversible capacity than conventional mesocarbon microbead (MCMB) powder. Reduced GNRs improve the capacity only marginally over the MCMB reference but present a lower Coulombic efficiency as well as a higher capacity loss per cycle. Oxidized GNRs (ox-GNRs) outperform all of the other materials studied here in terms of energy density. They present a first charge capacity of ∼1400 mA h g-1 with a low Coulombic efficiency for the first cycle (∼53%). The reversible capacity of ox-GNRs is in the range of 800 mA h g-1, with a capacity loss per cycle of ∼3% for early cycles and a decreasing loss rate for subsequent cycles.

Original languageEnglish
Pages (from-to)12556-12558
Number of pages3
JournalJournal of the American Chemical Society
Volume132
Issue number36
DOIs
StatePublished - Sep 15 2010

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