Journal
NANO ENERGY
Volume 86, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.106094
Keywords
Lithium-sulfur batteries; Amorphization; Metal organic framework; Separator; Polysulfide barrier
Categories
Funding
- Natural Science Foundation of Hebei Province of China [B2020202052]
- Outstanding Youth Project of Guangdong Natural Science Foundation [2021B1515020051]
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, China [EERI_PI2020007]
- Program for the Outstanding Young Talents of Hebei Province, China
- Chunhui Project of Ministry of Education of the People's Republic of China [Z2017010]
- Department of Science and Technology of Guangdong Province [2020B0909030004, 2019JC01L203]
- Guangdong Innovative and Entrepreneurial Team Program [2016ZT06C517]
- Science and Technology Program of Guangzhou [2019050001]
- Science and Technology Program of Zhaoqing [2019K038]
- Natural Sciences and Engineering Research Council of Canada
- Waterloo Institute for Nanotechnology
- University of Waterloo
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This study presents a novel strategy for efficient lithium-sulfur battery electrochemistry by modifying the separator with amorphous metal organic framework (MOF). The aMIL-88B-modified separator exhibits superior cyclability and high capacity retention in lithium-sulfur batteries.
Rational design of separator is especially critical in lithium-sulfur (Li-S) battery electrochemistry in view of the highly mobile intermediates and their detrimental chemical/electrochemical side reactions, which give rise to the notorious shuttle effect. Herein, we develop a novel strategy of amorphizing metal organic framework (MOF) exemplified by MIL-88B to construct advanced separator for Li-S batteries. The amorphization is achieved via a simple ligand competition method, and the product is endowed with higher adsorbability and catalytic activity to sulfur species attributed to the undercoordination effect. Therefore, Li-S batteries with the asdeveloped amorphous MOF (aMIL-88B)-modified separator realize efficient and reversible sulfur electrochemistry, exhibiting superb cyclability with high capacity retention of 740 mAh g-1 after 500 cycles at 1 C, rate performance up to 5 C, and also decent areal capacity under a high sulfur loading of 4.3 mg cm-2. This work provides a facile pathway towards multifunctional separators in Li-S batteries, and is also instructive to defect engineering of advanced materials in other related energy storage fields.
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