Imaging Heterogeneous Ion Transfer: Lithium Ion Quantification using Mercury Amalgams as In Situ Electrochemical Probes in Nonaqueous Media

Quantitative micro- and nano- probes were used for the in situ imaging of alkaline ion transfer processes at an electroactive surface. Detection of Li+, Na+ and K+ is possible.

Scientific Achievement

  • Quantitative electrochemical probes for the in situ detection of reactive fluxes of alkaline ions in non-aqueous media were developed
  • Probes can be used in direct (intake) and pre-concentration mode (stripping) for imaging the flux of ions from an electrochemically activated surface
  • Implementation of technique onto a 120 nm nano-Hg electrode shows promising for battery nano-imaging

Significance and Impact

  • Interfacial dynamics of ions in battery electrodes and membranes are poorly understood- imaging technique will target quantitatively heterogeneity in materials activity
  • In situ imaging for evolving interfaces: SEI formation, dissolution/electrodeposition
  • Currently in development for nano-imaging and use with multivalent species such as Mg2+and Ca2+

Research Details

  • Li+, Na+ and K+ quantification in the micromolar to millimolar range using micro- and nano- Hg deposits on scanning electrochemical microscopy tips in propylene carbonate
  • Proof of concept application to an Au substrate showing the effects of under-potential deposition on the local flux of Li+

Work performed at the University of Illinois at Urbana-Champaign (JCESR partner) by Barton, Z.J. and Rodriguez-Lopez, J., Anal. Chem., 2014.

DOI: 10.1021/ac502517b

Download this highlight

Latest Updates

See All