Microelectrodes for local conductivity and degradation measurements on Al stabilized Li7La3Zr2O12 garnets

Andreas Wachter-Welzl, R. Wagner, D. Rettenwander, S. Taibl, G. Amthauer, J. Fleig

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The attractiveness of Li7La3Zr2O12 (LLZO) cubic based garnets lies in their high ionic conductivity and the combination of thermal and electrochemical stability. However, relations between composition and conductivity as well as degradation effects are still not completely understood. In this contribution we demonstrate the applicability of microelectrodes (Ø = 20–300 μm) for electrochemical impedance spectroscopy (EIS) studies on LLZO garnets. Microelectrodes allow to obtain local information on the ionic conductivity. A comparison between the overall performance of the sample (3.3 × 10−4 S cm−1) and local measurements revealed differences in conductivity with a maximum of the locally measured values of 6.3 × 10−4 S cm−1 and a minimum of 2.6 × 10−4 S cm−1. One reason behind these conductivity variations is most probably a compositional gradient in the sample. In addition, microelectrodes are very sensitive to conductivity changes near to the surface. This was used to investigate the effect of moisture in ambient air on the conductivity variations of LLZO. Substantial changes of the measured Li-ion transport resistance were found, particularly for smaller microelectrodes which probe sample volumes close to the surface.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Electroceramics
DOIs
Publication statusPublished - 2016
Externally publishedYes

Fingerprint

Microelectrodes
Garnets
garnets
degradation
Degradation
conductivity
Ionic conductivity
ion currents
Electrochemical impedance spectroscopy
Moisture
moisture
Ions
thermal stability
impedance
Air
Chemical analysis
gradients
probes
air
spectroscopy

Keywords

  • Conductivity
  • Impedance spectroscopy
  • Li-ion batteries
  • LLZO
  • Microelectrode
  • Solid electrolyte

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Microelectrodes for local conductivity and degradation measurements on Al stabilized Li7La3Zr2O12 garnets. / Wachter-Welzl, Andreas; Wagner, R.; Rettenwander, D.; Taibl, S.; Amthauer, G.; Fleig, J.

In: Journal of Electroceramics, 2016, p. 1-6.

Research output: Contribution to journalArticleResearchpeer-review

Wachter-Welzl, Andreas ; Wagner, R. ; Rettenwander, D. ; Taibl, S. ; Amthauer, G. ; Fleig, J. / Microelectrodes for local conductivity and degradation measurements on Al stabilized Li7La3Zr2O12 garnets. In: Journal of Electroceramics. 2016 ; pp. 1-6.
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AU - Amthauer, G.

AU - Fleig, J.

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