Journal
ADVANCED MATERIALS
Volume 32, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201904876
Keywords
antimony selenide; catalytic conversion; lithium-sulfur batteries; modified separators; selenium vacancies
Categories
Funding
- Chunhui Project of Ministry of Education of the People's Republic of China [Z2017010]
- National Natural Science Foundation of China [21908039]
- Natural Science Foundation of Hebei Province [B2019202199]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- University of Waterloo
- Program for the Outstanding Young Talents of Hebei Province, China
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The shuttling behavior and sluggish conversion kinetics of the intermediate lithium polysulfides (LiPSs) represent the main obstructions to the practical application of lithium-sulfur (Li-S) batteries. Herein, an anion-deficient design of antimony selenide (Sb2Se3-x) is developed to establish a multifunctional LiPS barrier toward the inhibition of polysulfide shuttling and enhancement of battery performance. The defect chemistry in the as-developed Sb2Se3-x promotes the intrinsic conductivity, strengthens the chemical affinity to LiPSs, and catalyzes the sulfur electrochemical conversion, which are verified by a series of computational and experimental results. Attributed to these unique superiorities, the obtained LiPS barrier efficiently promotes and stabilizes the sulfur electrochemistry, thus enabling excellent Li-S battery performance, e.g., outstanding cyclability over 500 cycles at 1.0 C with a minimum capacity fading rate of 0.027% per cycle, a superb rate capability up to 8.0 C, and a high areal capacity of 7.46 mAh cm(-2) under raised sulfur loading. This work offers a defect engineering strategy toward fast and durable sulfur electrochemistry, holding great promise in developing practically viable Li-S batteries as well as enlightening the material design of related energy storage and conversion systems.
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