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

Research output: Contribution to journalArticle

55 Citations (Scopus)

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 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.

Original languageEnglish
Pages (from-to)344-353
Number of pages10
JournalEnergy Storage Materials
Volume16
DOIs
Publication statusPublished - 2019 Jan

Keywords

  • Chemical adsorption
  • Lithium polysulfide
  • Lithium-sulfur batteries
  • MXene sheets
  • Polydopamine

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Energy Engineering and Power Technology

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