A robust sulfur host with dual lithium polysulfide immobilization mechanism for long cycle life and high capacity Li-S batteries

Xiwen Wang, Chenghao Yang, Xunhui Xiong, Guilin Chen, Mingzhi Huang, Jeng Han Wang, Yong Liu, Meilin Liu, Kevin Huang*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

142 引文 斯高帕斯(Scopus)

摘要

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 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.

原文英語
頁(從 - 到)344-353
頁數10
期刊Energy Storage Materials
16
DOIs
出版狀態已發佈 - 2019 1月

ASJC Scopus subject areas

  • 可再生能源、永續發展與環境
  • 一般材料科學
  • 能源工程與電力技術

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