WEB Origin of Interfacial Resistance in All Solid State Li-Ion BatteriesTuesday (22.09.2020) 15:40 - 16:10 F: Functional Materials, Surfaces, and Devices 1 Part of:
The large interfacial resistance between electrolyte and electrode has become a significant roadblock for the commercialization of all solid-state batteries. The formation of high resistance interfacial phases, called interelectrode films (IEF), has been considered as one of the most significant reasons behind this effect. In this work, we studied the IEF formation in the perovskite electrolyte Li0.33La0.57TiO3(LLTO) and spinel cathode LiMn2O4 (LMO) pair by co-sintering experiments via Spark Plasma Sintering (SPS), as well as conventional sintering. While the processing method has an influence on the quality of the electrode/electrolyte contact, IEF could not be avoided. We directly characterized the IEF morphology via High Resolution Transmission Electron Microscopy (HRTEM). Additionally, we characterized the chemical make up of the interface with the help of analytical transmission electron microscopy (TEM) and Scanning Electron Microscopy (SEM) and revealed the elemental composition of the interphase. Furthermore, we used impedance spectroscopy to measure the electrical properties of the LLTO/LMO interelectrode film , and discovered that the interfacial resistance caused by interphase formation increases the resistance by over 30 times compared to the individual phases.