Improvement of preparation process for Li-ion conducting membranes composed of monolayered inorganic electrolyte particles and insulating polymer matrix

Abstract This article reports the electrochemical performance of hybridized Li-ion conductive membranes consisting of a monolayer of Li-ion-conducting particles uniformly embedded in an insulating polymer matrix. The prepared hybridized Li-ion conductive membranes with the Li1.3Al0.3Ti1.7P3O12 (LATP) solid electrolyte and a cycloolefin polymer were studied via AC impedance spectroscopy and typical battery testing. The conductivities of the hybridized Li-ion conductive membranes were 0.53 mS cm−1 at 20 °C and 0.22 mS cm−1 at −10 °C, approximately 6 and 15 times higher, respectively, than those of the commercial LATP sintered disc. In addition, the activation energy (17.2 kJ mol−1) was in agreement with that of the bulk of LATP and approximately half that of the commercial LATP sintered disc. The membranes were used in batteries and the possibility of further improvement was referred from the results of their overpotentials and surface analyses.