Electrocatalysis in Lithium Sulfur Batteries under Lean Electrolyte Conditions

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...

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Bibliographic Details
Published in:Angewandte Chemie 2018-11, Vol.130 (47), p.15775-15778
Main Authors: Yang, Yuxiang, Zhong, Yiren, Shi, Qiuwei, Wang, Zhenhua, Sun, Kening, Wang, Hailiang
Format: Article
Language:English
Subjects:
Batteries
Catalysis
Charging
Chemistry
Discharge
Electrocatalysis
Electrodes
Electrolytes
Elektrokatalyse
Kinetics
Lithium
Lithium sulfur batteries
Lithium-Schwefel-Batterien
Molybdenum
Molybdänphosphid
Nanoparticles
Phosphides
Reaction kinetics
Schlanke Elektrolyte
Spannungshysterese
Sulfur
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Summary: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 μLE mg−1S . Molybdänphosphid(MoP)‐Nanopartikel spielen eine elektrokatalytische Rolle in Lithium‐Schwefel‐Batterien mit schlanken Elektrolyten. Die Überpotentiale für die Lade‐ und Entladereaktionen an der Schwefelkathode werden stark gesenkt, woraus schnellere Prozesse und eine reversiblere Umwandlung der Schwefelspezies resultieren.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.201808311