Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7962406 | Energy Storage Materials | 2019 | 25 Pages |
Abstract
Beyond the physical lithium polysulfide (Li2Sx) entrapment of various 3D porous sulfur hosts, the importance of chemical interactions between sulfur host and Li2Sx 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 Li2Sx migration is still lacking. Here, we report a uniquely designed sulfur host that can immobilize Li2Sx 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 Li2Sx through the polar-polar interaction. Benefited from the double chemisorption, the new cathode with a high sulfur loading of 5â¯mgâ¯cmâ2 has been demonstrated with an initial capacity of 1001â¯mAâ¯hâ¯gâ1 at a capacity retention of 65% over 1000 cycles at 0.2â¯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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Authors
Xiwen Wang, Chenghao Yang, Xunhui Xiong, Guilin Chen, Mingzhi Huang, Jeng-Han Wang, Yong Liu, Meilin Liu, Kevin Huang,