Ion conductivity is the ability of a medium to carry current by the migration of ions, expressed as current density per unit applied field [1]. The value is the sum over species of charge, concentration and mobility, so it depends both on how many mobile ions exist and on how freely they move [2]. In a crystalline solid electrolyte the ions hop between lattice sites or through an amorphous phase, and the activation energy of the hop sets the temperature dependence [1]. In a polymer electrolyte the motion couples to segmental relaxation of the chains above the glass transition, so conductivity follows free volume rather than a simple Arrhenius law [3]. The quantity is measured by impedance spectroscopy, which separates the bulk response from electrode polarisation [2].
- ionic conductivity
- ion hopping
- activation energy
- impedance spectroscopy
- segmental relaxation
Thermal Expansion and Ionic Conductivity·Materials Chemistry·Materials Science·Physical Sciences
References
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