Journal
ENERGY STORAGE MATERIALS
Volume 16, Issue -, Pages 344-353Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2018.06.015
Keywords
Chemical adsorption; Lithium polysulfide; MXene sheets; Polydopamine; Lithium-sulfur batteries
Funding
- National Natural Science Foundation of China [51604122]
- Natural Science Foundation of Guangdong Province [2016A030310411, 2016A030306033]
- Technological Innovation Young Talents of Guangdong Special Support Plan [2014TQ01Z530]
- China Postdoctoral Science Foundation [2016M590784]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
- Project of Public Interest Research and Capacity Building of Guangdong Province [2014A010106007]
- Pearl River S & T Nova Program of Guangzhou [201506010030]
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Beyond the physical lithium polysulfide (Li(2)Sx) entrapment of various 3D porous sulfur hosts, the importance of chemical interactions between sulfur host and Li(2)Sx on performance of Li-S batteries has recently been highlighted. However, most of these studies focus mainly on one type of chemical interaction and effective suppression of Li(2)Sx migration is still lacking. Here, we report a uniquely designed sulfur host that can immobilize Li(2)Sx through a dual chemisorption mechanism. The new sulfur host is consisted of an MXene matrix and polydopamine (PDA) overcoat, where Mxene forms a strong Ti-S bonding by the Lewis acid-base mechanism while PDA withholds Li(2)Sx through the polar-polar interaction. Benefited from the double chemisorption, the new cathode with a high sulfur loading of 5 mg cm(-2) has been demonstrated with an initial capacity of 1001 mA h g(-1) at a capacity retention of 65% over 1000 cycles at 0.2 C. Overall, this study not only presents a unique chemical mechanism to entrap Li2Sx, but also provides a new way to rationally design a practical sulfur cathode for high-performance Li-S batteries.
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