Si nanotubes ALD coated with TiO2, TiN or Al2O 3 as high performance lithium ion battery anodes

Download
  1. Get@NRC: Si nanotubes ALD coated with TiO2, TiN or Al2O 3 as high performance lithium ion battery anodes (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1039/c3ta14302c
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Materials Chemistry A
ISSN2050-7488
Volume2
Issue8
Pages25042516; # of pages: 13
AbstractSilicon based hollow nanostructures are receiving significant scientific attention as potential high energy density anodes for lithium ion batteries. However their cycling performance still requires further improvement. Here we explore the use of atomic layer deposition (ALD) of TiO2, TiN and Al2O3 on the inner, the outer, or both surfaces of hollow Si nanotubes (SiNTs) for improving their cycling performance. We demonstrate that all three materials enhance the cycling performance, with optimum performance being achieved for SiNTs conformally coated on both sides with 1.5 nm of Li active TiO2. Substantial improvements are achieved in the cycling capacity retention (1700 mA h g-1vs. 1287 mA h g-1 for the uncoated baseline, after 200 cycles at 0.2 C), steady-state coulombic efficiency (∼100% vs. 97-98%), and high rate capability (capacity retention of 50% vs. 20%, going from 0.2 C to 5 C). TEM and other analytical techniques are employed to provide new insight into the lithiation cycling-induced failure mechanisms that turn out to be intimately linked to the microstructure and the location of these layers.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies
Peer reviewedYes
NPARC number21270873
Export citationExport as RIS
Report a correctionReport a correction
Record identifier8da40fde-f472-4d4a-b60c-859a5d00d51e
Record created2014-02-17
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)