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  • A Freestanding Flexible Single-Atom Cobalt-Based Multifunctional Interlayer toward Reversible and Durable Lithium-Sulfur Batteries

    Author(s)
    Li, Yiju
    Zhou, Peng
    Li, Hui
    Gao, Tingting
    Zhou, Lei
    Zhang, Yelong
    Xiao, Ni
    Xia, Zhonghong
    Wang, Liang
    Zhang, Qinghua
    Gu, Lin
    Guo, Shaojun
    Griffith University Author(s)
    Wang, Liang
    Year published
    2020
    Metadata
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    Abstract
    The development of Li‐S batteries is greatly hindered by the polysulfide shuttling and sluggish sulfur redox kinetics, leading to low utilization of active materials and rapid capacity decay. Herein, a freestanding multifunctional interlayer, prepared by layer‐by‐layer assembling of the single‐atom cobalt‐anchored nitrogen‐doped carbon nanosheets (NC@SA‐Co) and dual network of carbon nanotube‐cellulose nanofiber (CNT‐CNF) hybrid, is proposed to effectively enhance the polysulfide immobilization and sulfur redox kinetics. The conductive CNT network acts as the physical barrier to confine the polysulfide diffusion and to ...
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    The development of Li‐S batteries is greatly hindered by the polysulfide shuttling and sluggish sulfur redox kinetics, leading to low utilization of active materials and rapid capacity decay. Herein, a freestanding multifunctional interlayer, prepared by layer‐by‐layer assembling of the single‐atom cobalt‐anchored nitrogen‐doped carbon nanosheets (NC@SA‐Co) and dual network of carbon nanotube‐cellulose nanofiber (CNT‐CNF) hybrid, is proposed to effectively enhance the polysulfide immobilization and sulfur redox kinetics. The conductive CNT network acts as the physical barrier to confine the polysulfide diffusion and to facilitate the reuse of polysulfides. The oxygen‐group‐terminated CNF network allows the hopping of Li+ ion and suppresses the polysulfide crossover due to the strong electrostatic repulsion. Moreover, it is demonstrated that the 2D NC@SA‐Co with numerous well‐defined single sites of Co–N4 can effectively serve as an electrocatalyst to boost the reversible reaction of polysulfides. As a result, the assembled Li‐S batteries with the multifunctional interlayer deliver a high reversible specific capacity of 1160 mAh g−1 at 0.1 C and an ultralow capacity decay of 0.058% per cycle over 700 cycles. Even with a high sulfur loading of 7.2 mg cm−2, a high areal capacity of 8.3 mAh cm−2 can be achieved.
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    Journal Title
    Small Methods
    Volume
    4
    Issue
    3
    DOI
    https://doi.org/10.1002/smtd.201900701
    Subject
    Nanotechnology
    Electrical engineering
    Science & Technology
    Physical Sciences
    Chemistry, Physical
    Nanoscience & Nanotechnology
    Publication URI
    http://hdl.handle.net/10072/396937
    Collection
    • Journal articles

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