Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 47, Pages 15549-15552Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201808311
Keywords
electrocatalysis; lean electrolyte; lithium sulfur batteries; molybdenum phosphide; voltage hysteresis
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Funding
- Yale University
- Link Foundation Energy Fellowship
- China Scholarship Council (CSC)
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The presence of electrocatalysis in lithium-sulfur batteries has been proposed but not yet sufficiently verified. In this study, molybdenum phosphide (MoP) nanoparticles are shown to play a definitive electrocatalytic role for the sulfur cathode working under lean electrolyte conditions featuring a low electrolyte/active material ratio: the overpotentials for the charging and discharging reactions are greatly decreased. As a result, sulfur electrodes containing MoP nanoparticles show faster kinetics and more reversible conversion of sulfur species, leading to improvements in charging/discharging voltage profiles, capacity, rate performance, and cycling stability. Taking advantage of the electrocatalytic properties of MoP, high-performance sulfur electrodes were successfully realized that are steadily cyclable at a high areal capacity of 5.0 mAh cm(-2) with a challenging electrolyte/sulfur (E/S) ratio of 4 mu L(E)mg(-1) S.
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