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Issue 25, 2018
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Electrochemically active separators with excellent catalytic ability toward high-performance Li–S batteries

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Abstract

Separator modification has been proven to be a promising technology to realize high sulfur-utilization and long-life Li–S batteries. However, only relying on the chemisorption of polar materials or the conductivity of carbon materials cannot effectively accelerate polysulfide redox kinetics. Therefore, it's urgent to propose an effective strategy to solve the above problems simultaneously so as to accomplish high-performance Li–S batteries. Hence, in this paper, we present a new separator, which could not only show strong chemisorption with polysulfides but also accelerate polysulfide redox kinetics. What's more, VS4/graphene (VS4/G) coating materials are electrochemically active in Li–S battery systems, which could provide extra capacity for Li–S batteries. Attributed to the strong adsorption, fast lithium ion diffusion, reduced polarization potential and facile lithium ion transfer rate across the separator, the batteries with VS4/G coating modified separators exhibited enhanced electrochemical performance. When cycled at 2C, they could deliver an initial specific capacity of 810 mA h g−1, and when subjected to 2500 charge–discharge cycles, they could retain a decay rate as low as 0.021% per cycle.

Graphical abstract: Electrochemically active separators with excellent catalytic ability toward high-performance Li–S batteries

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Publication details

The article was received on 27 Mar 2018, accepted on 22 May 2018 and first published on 24 May 2018


Article type: Communication
DOI: 10.1039/C8TA02757A
Citation: J. Mater. Chem. A, 2018,6, 11694-11699
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    Electrochemically active separators with excellent catalytic ability toward high-performance Li–S batteries

    M. Wang, L. Fan, Y. Qiu, D. Chen, X. Wu, C. Zhao, J. Cheng, Y. Wang, N. Zhang and K. Sun, J. Mater. Chem. A, 2018, 6, 11694
    DOI: 10.1039/C8TA02757A

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