Internal fields in solid electrolytes due to interface effects

Martin, Bjoern; Kliem, Herbert
July 2009
Applied Physics Letters;7/20/2009, Vol. 95 Issue 3, p032901
Academic Journal
The space charge distribution and therefore the distribution of the internal potential in ion-conducting polymers can strongly be influenced by electrode effects. Due to image forces the electrodes attract mobile ions to the electrolyte/electrode interface. Simulations performed with a three-dimensional hopping model yield a charge accumulation of mobile ions at the electrodes as well as a depletion zone near this accumulation layer even without external applied field. The resulting potential shows a maximum in the middle of the sample. Measurements of the surface potential performed with a scanning Kelvin probe using polyethylene oxide confirm the model.


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