Determining the mobility of ions by transient current measurements at high voltages

Determining the mobility of ions by transient current measurements at high voltages

We present polarization and transient current experiments that allow an independent determination of the charge carrier density and the mobility of ions in polymer electrolytes at low charge carrier density. The method relies on a complete depletion of ions in the bulk electrolyte achieved by applyi...

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Veröffentlicht in:Physical review letters 2007-08, Vol.99 (8), p.086104-086104, Article 086104
Hauptverfasser: Kohn, Peter, Schröter, Klaus, Thurn-Albrecht, Thomas
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Sprache:eng
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Electric Conductivity
Electrolytes
Ions
Lithium
Polymers
Sodium Chloride
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container_title Physical review letters
container_volume 99
creator Kohn, Peter
Schröter, Klaus
Thurn-Albrecht, Thomas
description We present polarization and transient current experiments that allow an independent determination of the charge carrier density and the mobility of ions in polymer electrolytes at low charge carrier density. The method relies on a complete depletion of ions in the bulk electrolyte achieved by applying high voltages. Based on a qualitative model for the charge dynamics in this nonlinear regime, the method is exemplarily applied to a system of polymethylmethacrylate doped with small amounts of a lithium salt. The independently obtained values for the ionic mobility, the charge carrier density, and the conductivity are consistent for all salt concentrations studied. Criteria for the applicability of the method are discussed.
doi_str_mv 10.1103/PhysRevLett.99.086104
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subjects Electric Conductivity
Electrolytes
Ions
Lithium
Polymers
Sodium Chloride
title Determining the mobility of ions by transient current measurements at high voltages
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