Assessing the Electrochemical Stability Window of NASICON-Type Solid Electrolytes

All-Solid-State Lithium Batteries (ASSLBs) are promising since they may enable the use of high potential materials as positive electrode and lithium metal negative electrode. This is only possible through solid electrolytes (SEs) stated large electrochemical stability window (ESW). Nevertheless, reported values for these ESWs very divergent in literature. Establishing a robust procedure to accurately determine SEs’ has therefore become crucial. Our work focuses on bringing together theoretical results an original experimental set up assess two NASICON-type SEs Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) 1.5 0.5 Ge (LAGP). Using first principles, we computed thermodynamic LATP LAGP their decomposition products upon redox potentials. The set-up consists sintered stack thin SE layer SE-Au composite allow contact surface between conductive gold particles, which maximizes currents. Potentiostatic Intermittent Titration Technique (PITT) measurements, were able ESW electrolytes. They found be [2.65–4.6 V] [1.85–4.9 respectively. Finally, attempted characterize both oxidation. O 2 sensor coupled setup enabled us observe operando production oxidations, agreement with first-principles calculations. Transmission Electron Microscopy (TEM) allowed presence amorphous phase at interface particles after Electrochemical Impedance Spectroscopy (EIS) measurements confirmed that resulting increased total resistance LAGP. aims providing method accurate determination ESWs, considered key parameter successful material selection ASSLBs.