Jump to main content
Jump to site search

Issue 38, 2018
Previous Article Next Article

Aqueous-processable polymer binder with strong mechanical and polysulfide-trapping properties for high performance of lithium–sulfur batteries

Author affiliations

Abstract

Lithium–sulfur batteries (LSBs) are regarded as the next-generation high-performance energy storage devices due to their high energy density. However, the long-term use of LSBs in practical applications is limited by the shuttle effect resulting from the diffusion of lithium polysulfides (LiPS) in electrolyte. To address these challenges, a novel aqueous-processable polymer with multiple functional groups, catechol-conjugated chitosan sulfate (CCS), is developed as the binder of the sulfur cathode. The CCS binder demonstrates strong adsorption capability to trap LiPS, as evidenced by ultraviolet-visible (UV-vis) spectra and density functional theory (DFT) calculations. Its excellent mechanical and binding properties also result in stabilization of sulfur cathodes in long-term cycling. LSBs assembled with CCS exhibit remarkable improvement in cycling performance with high capacity retention of 80.14% after 400 cycles at 0.5C, and the electrodes maintain their integrity without any clear cracks. At a high rate of 2C, the LSBs can still maintain 77.30% capacity after 300 cycles with high coulombic efficiency of 99.37%. Our results provide new insights into the significance of sulfate and catechol groups in CCS binder for sulfur cathode and pave a new way for the tailoring of the chemical structures of natural polymers to realize LSBs with superior electrochemical performance.

Graphical abstract: Aqueous-processable polymer binder with strong mechanical and polysulfide-trapping properties for high performance of lithium–sulfur batteries

Back to tab navigation

Supplementary files

Publication details

The article was received on 26 Jul 2018, accepted on 04 Sep 2018 and first published on 05 Sep 2018


Article type: Paper
DOI: 10.1039/C8TA07194B
Citation: J. Mater. Chem. A, 2018,6, 18660-18668
  •   Request permissions

    Aqueous-processable polymer binder with strong mechanical and polysulfide-trapping properties for high performance of lithium–sulfur batteries

    H. Yi, T. Lan, Y. Yang, Z. Lei, H. Zeng, T. Tang, C. Wang and Y. Deng, J. Mater. Chem. A, 2018, 6, 18660
    DOI: 10.1039/C8TA07194B

Search articles by author

Spotlight

Advertisements