Beyond the Polysulfide Shuttle and Lithium Dendrite Formation: Addressing the Sluggish Sulfur Redox Kinetics for Practical High-Energy Li-S Batteries.
Angew Chem Int Ed Engl
; 59(40): 17634-17640, 2020 Sep 28.
Article
em En
| MEDLINE
| ID: mdl-32645250
ABSTRACT
Electrolyte modulation simultaneously suppresses polysulfide the shuttle effect and lithium dendrite formation of lithium-sulfur (Li-S) batteries. However, the sluggish S redox kinetics, especially under high S loading and lean electrolyte operation, has been ignored, which dramatically limits the cycle life and energy density of practical Li-S pouch cells. Herein, we demonstrate that a rational combination of selenium doping, core-shell hollow host structure, and fluorinated ether electrolytes enables ultrastable Li stripping/plating and essentially no polysulfide shuttle as well as fast redox kinetics. Thus, high areal capacity (>4â
mAh cm-2 ) with excellent cycle stability and Coulombic efficiency were both demonstrated in Li metal anode and thick S cathode (4.5â
mg cm-2 ) with a low electrolyte/sulfur ratio (10â
µL mg-1 ). This research further demonstrates a durable Li-Se/S pouch cell with high specific capacity, validating the potential practical applications.
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MEDLINE
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En
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2020
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Article