Twin boundary-assisted lithium-ion transport

Anmin Nie, Liyong Gan, Yingchun Cheng, Qianqian Li, Yifei Yuan, Farzad Mashayek, Hongtao Wang, Robert F. Klie, Udo Schwingenschlögl, Reza Shahbazian-Yassar

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

With the increased need for high-rate Li-ion batteries, it has become apparent that new electrode materials with enhanced Li-ion transport should be designed. Interfaces, such as twin boundaries (TBs), offer new opportunities to navigate the ionic transport within nanoscale materials. Here, we demonstrate the effects of TBs on the Li-ion transport properties in single crystalline SnO2 nanowires. It is shown that the TB-assisted lithiation pathways are remarkably different from the previously reported lithiation behavior in SnO2 nanowires without TBs. Our in situ transmission electron microscopy study combined with direct atomic-scale imaging of the initial lithiation stage of the TB-SnO2 nanowires prove that the lithium ions prefer to intercalate in the vicinity of the (101¯) TB, which acts as conduit for lithium-ion diffusion inside the nanowires. The density functional theory modeling shows that it is energetically preferred for lithium ions to accumulate near the TB compared to perfect neighboring lattice area. These findings may lead to the design of new electrode materials that incorporate TBs as efficient lithium pathways, and eventually, the development of next generation rechargeable batteries that surpass the rate performance of the current commercial Li-ion batteries.
Original languageEnglish (US)
Pages (from-to)610-615
Number of pages6
JournalNano Letters
Volume15
Issue number1
DOIs
StatePublished - Dec 22 2014

ASJC Scopus subject areas

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

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