Observation of Chemomechanical Failure and the Influence of Cutoff Potentials in All-Solid-State Li–S Batteries

By Saneyuki Ohno, Raimund Koerver, Georg F. Dewald, Carolin Rosenbach, Paul Titscher, Dominik Steckermeier, A. Kwade, J. Janek, W. Zeier. Chemistry of Materials, 2019

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Because of a remarkably high theoretical energy density, the lithium–sulfur (Li–S) battery has attracted significant attention as a candidate for next-generation batteries. While employing solid electrolytes can provide a new avenue for high-capacity Li–S cells, all-solid-state batteries have unique failure mechanisms such as chemomechanical failure due to the volume changes of active materials. In this study, we investigate all-solid-state Li–S model cells with differently processed cathode composites and elucidate a typical failure mechanism stemming from irreversible Li2S formation in the cathode composites. Reducing the particle size is key to minimizing the influence of volume changes, and a capacity of >1000 mAh gsulfur–1 is achieved by ball milling of the cathode composites. In addition, the long-term stability of the ball-milled cathode is investigated by varying the upper and lower cutoff potentials for cycling, which results in the unveiling of the significantly detrimental role of the lower cut...

Subfields: Automotive Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/7eea7eb38d8801445062c5e64ef19569e54d2eeb