Enhanced cyclic performance and lithium storage capacity of SnO 2/graphene nanoporous electrodes with three-dimensionally delaminated flexible structure

Seung Min Paek, Eun Joo Yoo, Itaru Honma

Research output: Contribution to journalArticlepeer-review

1514 Citations (Scopus)

Abstract

To fabricate nanoporous electrode materials with delaminated slructure, the graphene nanosheets (GNS) in the ethylene glycol solution were reassembled in the presence of rutile Sn02 nanoparticles. According to the TEM analysis, the graphene nanosheets are homogeneously distributed between the loosely packed Sn02 nanoparticles in such a way that the nanoporous structure with a large amount of void spaces could be prepared. The obtained SnO2/GNS exhibits a reversible capacity of 810 mAh/g; furthermore, its cycling performance is drastically enhanced In comparison with that of the bare Sn02 nanoparticle. After 30 cycles, the charge capacity of Sn¢yGNS still remained 570 mAh/g, that is, about 70% retention of the reversible capacity, while the specific capacity of the bare Sn02 nanoparticle on the first charge was 550 mAh/g, dropping rapidly to 60 mAh/g only after 15 cycles. The dimensional confinement of tin oxide nanoparticles by the surrounding GNS limits the volume expansion upon lithium insertion, and the developed pores between Sn02 and GNS could be used as buffered spaces during charge/discharge, resulting in the superior cyclic performances.

Original languageEnglish
Pages (from-to)72-75
Number of pages4
JournalNano Letters
Volume9
Issue number1
DOIs
Publication statusPublished - 2009 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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