Model Ge microstructures as anodes for Li-ion batteries

Brandon R. Long, Jason L. Goldman, Ralph G. Nuzzo, Andrew A. Gewirth

Research output: Contribution to journalArticlepeer-review

Abstract

We examine the properties of microstructured Ge electrodes for Li-ion battery applications. Modelmicrofabricated single-crystalline Ge electrode structures are used to investigate the effects of Cu coating and partial discharging on cycle life. Results show that the Ge microstructures insert Li more isotropically than do comparable ones comprised of Si. A model Ge microbar electrode with a Cu coating is capable of 95 % coulombic efficiency after 40 cycles when the amount of charge is limited. The microstructured Ge electrode is found to exhibit poor performance at higher delithiation rates (above C/5) relative to microstructured Si electrodes. These results provide an understanding of the effects of electrochemical processes on modelmicrostructured Ge electrodes which may ultimately aid in the development of advanced anodes for Li-ion batteries.

Original languageEnglish (US)
Pages (from-to)3015-3020
Number of pages6
JournalJournal of Solid State Electrochemistry
Volume17
Issue number12
DOIs
StatePublished - Jun 18 2013

Keywords

  • Germanium anode
  • High rate
  • Li-ion batteries
  • Microstructured electrode

ASJC Scopus subject areas

  • Electrochemistry
  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Materials Science(all)

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