Ion transport through LiCoO2/(Li2O)x · (B2O3) thin-film bi-layers

e-Gun deposited bi-layer structures of LiCoO2/(Li2O)x · (B2O3) cathode material and solid electrolyte have been investigated by SEM and impedance spectroscopy. The crystallinity of the substrates, on which the structures are deposited, influences the extent of crystallization, and consequently the ionic conductivity, of the electrolyte layer. Comparison of impedance spectra between bi-layers and electrolyte single layers indicates that the total ionic conductivity of the electrolyte in the bi-layer is decreased with respect to the single layer, due to higher crystallization.