Stable silicon-ionic liquid interface for next-generation lithium-ion batteries

Daniela Molina Piper, Tyler Evans, Kevin Leung, Tylan Watkins, Jarred Olson, Seul Cham Kim, Sang Sub Han, Vinay Bhat, Kyu Hwan Oh, Daniel Buttry, Se Hee Lee

Research output: Contribution to journalArticlepeer-review

204 Scopus citations


We are currently in the midst of a race to discover and develop new battery materials capable of providing high energy-density at low cost. By combining a high-performance Si electrode architecture with a room temperature ionic liquid electrolyte, here we demonstrate a highly energy-dense lithium-ion cell with an impressively long cycling life, maintaining over 75% capacity after 500 cycles. Such high performance is enabled by a stable half-cell coulombic efficiency of 99.97%, averaged over the first 200 cycles. Equally as significant, our detailed characterization elucidates the previously convoluted mechanisms of the solid-electrolyte interphase on Si electrodes. We provide a theoretical simulation to model the interface and microstructural-compositional analyses that confirm our theoretical predictions and allow us to visualize the precise location and constitution of various interfacial components. This work provides new science related to the interfacial stability of Si-based materials while granting positive exposure to ionic liquid electrochemistry.

Original languageEnglish (US)
Article number6230
JournalNature communications
StatePublished - Feb 25 2015

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy


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