Journal article

Publication year: 2019

Pages: 2930-2940

Journal: Chemistry of Materials

Volume number: 31

Issue number: 8

ISSN: 0897-4756

Open access status: Green

DOI Link: https://doi.org/10.1021/acs.chemmater.9b00282

Publisher: American Chemical Society

Abstract: 
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-solidstate 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 g(sulfur)(-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 cutoff potential. Preventing a deep discharge leads to a reversible capacity of 800 mAh g(sulfur)(-1) over 50 cycles in the optimized cell. This work highlights the importance of mitigating chemomechanical failure using microstructural engineering as well as the influence of the cutoff potentials in all-solid-state Li-S batteries.

Harvard Citation style: Ohno, S., Koerver, R., Dewald, G., Rosenbach, C., Titscher, P., Steckermeier, D., et al. (2019) Observation of Chemomechanical Failure and the Influence of Cutoff Potentials in All-Solid-State Li-S Batteries, Chemistry of Materials, 31(8), pp. 2930-2940. https://doi.org/10.1021/acs.chemmater.9b00282

APA Citation style: Ohno, S., Koerver, R., Dewald, G., Rosenbach, C., Titscher, P., Steckermeier, D., Kwade, A., Janek, J., & Zeier, W. (2019). Observation of Chemomechanical Failure and the Influence of Cutoff Potentials in All-Solid-State Li-S Batteries. Chemistry of Materials. 31(8), 2930-2940. https://doi.org/10.1021/acs.chemmater.9b00282