Nanoheterogeneity of LiTFSI Solutions Transitions Close to a Surface and with Concentration

Mengwei Han, Ruixian Zhang, Andrew A. Gewirth, Rosa M. Espinosa-Marzal

Research output: Contribution to journalArticlepeer-review

Abstract

Water-in-salt (WIS) electrolytes composed of 21 m LiTFSI have recently emerged as a safe and environmentally friendly alternative to conventional organic electrolytes in Li-ion batteries. Several studies have emphasized the relation between the high conductivity of WIS electrolytes and their nanoscale structure. Combining force measurements with a surface forces apparatus and atomic force microscopy, this study describes the nanoheterogeneity of LiTFSI solutions as a function of concentration and distance from a negatively charged (mica) surface. We report various nanostructures coexisting in the WIS electrolyte, whose size increases with concentration and is influenced by the proximity of the mica surface. Two key concentration thresholds are identified, beyond which a transition of behavior is observed. The careful scrutinization on the concentration-dependent nanostructures lays groundwork for designing novel electrolytes in future energy storage devices.

Original languageEnglish (US)
Pages (from-to)2304-2309
Number of pages6
JournalNano letters
Volume21
Issue number5
DOIs
StatePublished - Mar 10 2021

Keywords

  • Nanostructures
  • Surface forces
  • Water-in-salt electrolytes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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