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FTO Darkening Rate as a Qualitative, High-Throughput Mapping Method for Screening Li-Ionic Conduction in Thin Solid

Shay Tirosh1, Niv Aloni2, Simcha Meir1

  • 1Department of Chemistry, Center for Nanotechnology and Advanced Materials , Bar Ilan University , Ramat Gan , Israel , 529000.

ACS Combinatorial Science
|November 15, 2019
PubMed
Summary
This summary is machine-generated.

A new optical method quickly maps lithium-ion (Li-ion) conductivity in ceramic films by observing FTO darkening. This technique offers a simple, fast way to screen potential Li-ion conductor materials.

Keywords:
FTO darkening ratecombinatorial sciencehigh-throughputimpedance of thin film electrolytesoptoelectrochemicalqualitative screeningthin-film solid electrolyte

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-state ionics

Background:

  • Developing efficient lithium-ion (Li-ion) conductors is crucial for advanced energy storage technologies.
  • High-throughput screening methods are needed to accelerate the discovery of new Li-ion conducting ceramic films.
  • Current methods for characterizing Li-ion conductivity can be time-consuming and complex.

Purpose of the Study:

  • To introduce a novel, high-throughput optoelectrochemical method for mapping Li-ion conductivity in thin ceramic films.
  • To validate the method using model Li-ion conducting systems.
  • To establish the correlation between the optical signal and Li-ion transport properties.

Main Methods:

  • A combinatorial screening approach utilizing an optical effect termed 'FTO darkening'.
  • Measurement of optical transmission changes in the F-doped tin oxide (FTO) substrate.
  • Correlation of optical darkening rates with film thickness and lateral composition variations.
  • Validation against electrochemical impedance spectroscopy.

Main Results:

  • The FTO darkening rate directly correlates with Li-ion migration rates through the ceramic film.
  • A linear relationship was observed between darkening rate and the inverse of film thickness.
  • The optical mapping accurately reflects Li-ion conduction pathways and can be compared with resistance maps.
  • The method successfully distinguished between pure ionic and mixed conductivity in model systems.

Conclusions:

  • The FTO darkening method provides a fast, simple, and qualitative tool for screening Li-ion conducting ceramic films.
  • This technique enables planar mapping of Li-ion conductivity, aiding in material optimization.
  • The method's ability to distinguish conductivity types and its reversibility offer potential for broader applications in materials research.