Incorporating Solvate and Solid Electrolytes for All-Solid-State Li2S Batteries with High Capacity and Long Cycle Life

Work performed at University of Illinois at Urbana-Champaign (JCESR partner) by M. Shin, A. A. Gewirth, Adv. Energy. Mater. 2019, 1900938 DOI: 10.1002/aenm.201900938

Scientific Achievement

Incorporating highly concentrated solvate electrolyte into all‐solid‐state Li2S batteries significantly improves the battery performance compared to its bare counterpart. The origin of the improved battery cyclability is the favorable interfacial contact, where the ion conducting network surrounding the active material remains intact even after the significant volume contraction of the Li2S cathode.

Significance and Impact

We provide a design rule to efficiently modify the electrolyte/electrode interface, while demonstrating a simple and scalable approach to achieve high‐performance solid‐state batteries.

Research Details

  • The incorporation of an interlayer significantly improves the cycling performance of solid‐state Li2S batteries compared to the bare counterpart, exhibiting a specific capacity of 760 mAhg−1 at cycle 100 (330 mAhg−1 for the bare cell).
  • Electrochemical impedance spectroscopy shows that the interfacial resistance of the interlayer‐modified cell gradually decreases as a function of cycle number, while the impedance of the bare cell remains almost constant.


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