Lithium intercalation behavior in multilayer silicon electrodes

Tim T. Fister*, Jennifer Esbenshade, Xiao Chen, Brandon R. Long, Bing Shi, Christian M. Schlepütz, Andrew A. Gewirth, Michael J. Bedzyk, Paul Fenter

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Next generation lithium battery materials will require a fundamental shift from those based on intercalation to elements or compounds that alloy directly with lithium. Intermetallics, for instance, can electrochemically alloy to Li4.4M (M = Si, Ge, Sn, etc.), providing order-of-magnitude increases in energy density. Unlike the stable crystal structure of intercalation materials, intermetallic-based electrodes undergo dramatic volume changes that rapidly degrade the performance of the battery. Here, the energy density of silicon is combined with the structural reversibility of an intercalation material using a silicon/metal-silicide multilayer. In operando X-ray reflectivity confirms the multilayer's structural reversibility during lithium insertion and extraction, despite an overall 3.3-fold vertical expansion. The multilayer electrodes also show enhanced long-term cyclability and rate capabilities relative to a comparable silicon thin film electrode. This intercalation behavior found by dimensionally constraining silicon's lithiation promises applicability to a wide range of conversion reactions.

Original languageEnglish (US)
Article number1301494
JournalAdvanced Energy Materials
Volume4
Issue number7
DOIs
StatePublished - May 13 2014

Keywords

  • batteries
  • intercalation
  • multilayer electrodes
  • reflectivity
  • silicon

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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