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

Saneyuki Ohno, Raimund Koerver, Georg Dewald, Carolin Rosenbach, Paul Titscher, Dominik Steckermeier, Arno Kwade, Jürgen Janek, Wolfgang G. Zeier

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

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-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 Li 2 S 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.

Original languageEnglish
Pages (from-to)2930-2940
Number of pages11
JournalChemistry of Materials
Volume31
Issue number8
DOIs
Publication statusPublished - Apr 23 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Observation of Chemomechanical Failure and the Influence of Cutoff Potentials in All-Solid-State Li-S Batteries'. Together they form a unique fingerprint.

Cite this