Kinetically limited de-lithiation behavior of nanoscale tin-covered tin oxide nanowires

Praveen Meduri, Ezra Clark, Ethirajulu Dayalan, Gamini U. Sumanasekera, Mahendra K. Sunkara

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

In this paper, we report that Sn-nanocluster-covered SnO2 nanowire ("hybrid architectures") electrodes exhibited stage-wise de-lithiation suggesting complete lithium extraction. The lithiation and de-lithiation behavior explains that the high capacity retention of 814 mAh g-1 and durability over hundred cycles is because of low irreversible capacity loss. Mono-layers of un-agglomerated, sub 60 nm size Sn clusters supported on metallic electrodes also exhibited similar stage-wise de-lithiation while the microscale Sn clusters exhibited single-phase lithium extraction. This can be attributed to shorter lithium ion diffusion lengths and high surface area of the nanomaterials. The cyclic voltammetric studies of Sn nanoclusters (sub 60 nm size) confirm the reaction kinetics limited behavior of lithiation and de-lithiation characteristics. The Sn-nanocluster-covered SnO2 nanowires showed a capacity retention of 458 mAh g-1 at 500 mAg-1 current density indicating an excellent rate capability.

Original languageEnglish (US)
Pages (from-to)1695-1699
Number of pages5
JournalEnergy and Environmental Science
Volume4
Issue number5
DOIs
StatePublished - May 2011

All Science Journal Classification (ASJC) codes

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution

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