Defective graphene as a high-capacity anode material for Na- and Ca-ion batteries

Dibakar Datta, Junwen Li, Vivek B. Shenoy

Research output: Contribution to journalArticlepeer-review

253 Scopus citations

Abstract

Because of their abundance, sodium and calcium can be attractive in ion batteries for large-scale grid storage. However, many of the anode materials being pursued have limitations including volume expansion, lack of passivating films, and slow kinetics. Here, we investigate the adsorption of Na and Ca on graphene with divacancy and Stone-Wales defects in graphene. Our results show that although adsorption of Na and Ca is not possible on pristine graphene, enhanced adsorption is observed on defective graphene because of increased charge transfer between the adatoms and defects. We find that the capacity of graphene increases with the density of the defects. For the maximum possible divacancy defect densities, capacities of 1450 and 2900 mAh/g for Na- and Ca-ion batteries, respectively, can be achieved. For Stone-Wales defects, we find maximum capacities of 1071 and 2142 mAh/g for Na and Ca, respectively. Our results provide guidelines to create better high-capacity anode materials for Na- and Ca-ion batteries.

Original languageEnglish (US)
Pages (from-to)1788-1795
Number of pages8
JournalACS Applied Materials and Interfaces
Volume6
Issue number3
DOIs
StatePublished - Feb 12 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Keywords

  • Ca ion
  • Na ion
  • anode materials
  • batteries
  • defective graphene

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