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 journalArticle

107 Citations (Scopus)

Abstract

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
Volume6
DOIs
StatePublished - Feb 25 2015

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Ionic Liquids
Silicon
Lithium
Electrolytes
electric batteries
Electrodes
lithium
Ions
Electrochemistry
cycles
Constitution and Bylaws
Interphase
Solid electrolytes
silicon
liquids
ions
electrodes
constitution
solid electrolytes
electrochemistry

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Piper, D. M., Evans, T., Leung, K., Watkins, T., Olson, J., Kim, S. C., ... Lee, S. H. (2015). Stable silicon-ionic liquid interface for next-generation lithium-ion batteries. Nature Communications, 6, [6230]. https://doi.org/10.1038/ncomms7230

Stable silicon-ionic liquid interface for next-generation lithium-ion batteries. / Piper, Daniela Molina; Evans, Tyler; Leung, Kevin; Watkins, Tylan; Olson, Jarred; Kim, Seul Cham; Han, Sang Sub; Bhat, Vinay; Oh, Kyu Hwan; Buttry, Daniel; Lee, Se Hee.

In: Nature Communications, Vol. 6, 6230, 25.02.2015.

Research output: Contribution to journalArticle

Piper, DM, Evans, T, Leung, K, Watkins, T, Olson, J, Kim, SC, Han, SS, Bhat, V, Oh, KH, Buttry, D & Lee, SH 2015, 'Stable silicon-ionic liquid interface for next-generation lithium-ion batteries', Nature Communications, vol. 6, 6230. https://doi.org/10.1038/ncomms7230
Piper, Daniela Molina ; Evans, Tyler ; Leung, Kevin ; Watkins, Tylan ; Olson, Jarred ; Kim, Seul Cham ; Han, Sang Sub ; Bhat, Vinay ; Oh, Kyu Hwan ; Buttry, Daniel ; Lee, Se Hee. / Stable silicon-ionic liquid interface for next-generation lithium-ion batteries. In: Nature Communications. 2015 ; Vol. 6.
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