Si/Ge double-layered nanotube array as a lithium ion battery anode

Taeseup Song, Huanyu Cheng, Heechae Choi, Jin Hyon Lee, Hyungkyu Han, Dong Hyun Lee, Dong Su Yoo, Moon Seok Kwon, Jae Man Choi, Seok Gwang Doo, Hyuk Chang, Jianliang Xiao, Yonggang Huang, Won Il Park, Yong Chae Chung, Hansu Kim*, John A. Rogers, Ungyu Paik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

219 Scopus citations


Figure Persented: Problems related to tremendous volume changes associated with cycling and the low electron conductivity and ion diffusivity of Si represent major obstacles to its use in high-capacity anodes for lithium ion batteries. We have developed a group IVA based nanotube heterostructure array, consisting of a high-capacity Si inner layer and a highly conductive Ge outer layer, to yield both favorable mechanics and kinetics in battery applications. This type of Si/Ge double-layered nanotube array electrode exhibits improved electrochemical performances over the analogous homogeneous Si system, including stable capacity retention (85% after 50 cycles) and doubled capacity at a 3C rate. These results stem from reduced maximum hoop strain in the nanotubes, supported by theoretical mechanics modeling, and lowered activation energy barrier for Li diffusion. This electrode technology creates opportunities in the development of group IVA nanotube heterostructures for next generation lithium ion batteries.

Original languageEnglish (US)
Pages (from-to)303-309
Number of pages7
JournalACS nano
Issue number1
StatePublished - Jan 24 2012


  • anode
  • germanium
  • lithium ion batteries
  • nanotubes
  • silicon

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy


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