Mechanical failure of garnet electrolytes during Li electrodeposition observed by in-operando microscopy

By William Manalastas, Jokin Rikarte, R. Chater, Rowena H. Brugge, A. Aguadero, Lucienne Buannic, A. Llordés, F. Aguesse, John A. Kilner. Journal of Power Sources, 2019

136 citations recorded by the source corpus.

Abstract Metallic Li anodes are key to reaching high energy densities in next-generation solid-state batteries, however, major problems are the non-uniform deposition of Li at the interface and the penetrative power of Li metal during operation, which cause failure of the ceramic electrolyte, internal short-circuits and a premature end of battery life. In this work, we explore the anode-electrolyte interface instability of a Li metal-garnet electrolyte system during Li electrodeposition, and its implications for mechanical fracture, Li metal propagation, and electrolyte failure. The degradation mechanism was followed step-by-step during in-operando electrochemical cycling using optical and scanning electron microscopy. High amounts of Li electrodeposition in a localized zone of the interface lead to ceramic fracture followed by an electrode-to-electrode electrical connection via a conductor Li metal filament. This work enables deeper understanding of battery failure modes in all-solid-state batteries containing a ceramic electrolyte membrane.

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/5bb3865f8f9f14b3549db9c7250f666df29eb77e

Citations in the corpus

• Characterizing the Li-Solid-Electrolyte Interface Dynamics as a Function of Stack Pressure and Current Density (2019, unknown): “These lower current densities are reasonable given the current-pressure regimes defined in this study.(11,15,24) Many of the studies that demonstrate low overpotentials at high currents and/or at low stack pressures incorporate interfacial layers between the Li and LLZO, which presumably affects the”