Temperature Dependence of Lithium Anode Voiding in Argyrodite Solid-State Batteries

Void formation at the Li/ceramic electrolyte interface of an all-solid-state battery on discharge results in high local current densities, dendrites charge, and cell failure. Here, we show that such voiding is reduced Li/Li6PS5Cl elevated temperatures, sufficient to increase critical before failure from <0.25 mA cm-2 25 °C 0.25 60 0.5 80 under a relatively low stack-pressure 1 MPa. Increasing 5 MPa temperature permits stable cycling 2.5 cm-2. It also shown charge-transfer resistance depends pressure temperature, with pressures required maintain -20 °C. These are consistent plastic deformation Li metal dominating performance anode, posing challenges for implementation solid-state cells anodes.