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首页> 外文期刊>Advanced energy materials >Novel 2D Sb2S3 Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance
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Novel 2D Sb2S3 Nanosheet/CNT Coupling Layer for Exceptional Polysulfide Recycling Performance

机译：新型2D Sb2S3纳米片/ CNT耦合层，具有出色的多硫化物再循环性能

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摘要

2D layer-structured materials are considered a promising candidate as a coupling material in lithium sulfur batteries (LSBs) due to their high surface-volume ratio and abundant active binding sites, which can efficiently mitigate shuttling of soluble polysulfides. Herein, an electrochemical Li intercalation and exfoliation strategy is used to prepare 2D Sb2S3 nanosheets (SSNSs), which are incorporated onto a separator in LSBs as a new 2D coupling material for the first time. The cells containing a rationally designed separator which is coated with an SSNS/carbon nanotube (CNT) coupling layer deliver a much improved specific capacity with a remarkable 0.05% decay rate for over 200 cycles at a current density of 2 C. The capability of the SSNSs to entrap polysulfides through their favorable interfacial functionality and the high electrical conductivity of the CNT network facilitates recycling of active materials. The first-principle calculations verify the important roles of SSNSs, which demonstrate ideal binding strengths (1.33-2.14 eV) to entrap Li2Sx as well as a low-energy barrier (189 meV) for Li diffusion. These findings offer new insights into discovering novel coupling layers for high-performance LSBs and shed new light on the application of 2D layer-structured materials in energy storage systems.
机译：2D层结构材料因其高的表面体积比和丰富的活性结合位点而被认为是锂硫电池（LSB）的偶联材料，有望有效地缓解可溶性多硫化物的穿梭作用。在本文中，电化学Li嵌入和剥落策略用于制备2D Sb2S3纳米片（SSNS），首次将其作为新的2D耦合材料并入LSB的隔膜中。包含经过合理设计的隔离膜并涂覆有SSNS /碳纳米管（CNT）耦合层的电池在2 C的电流密度下以200个循环提供了显着提高的比容量和显着的0.05％衰减率。 SSNS通过其良好的界面功能和CNT网络的高电导率捕获多硫化物，从而促进了活性物质的循环利用。第一性原理计算验证了SSNS的重要作用，它证明了捕获Li2Sx的理想结合强度（1.33-2.14 eV）以及用于Li扩散的低能垒（189 meV）。这些发现为发现用于高性能LSB的新型耦合层提供了新见识，并为二维二维结构化材料在储能系统中的应用提供了新的思路。

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  • 来源
    《Advanced energy materials》 |2018年第24期|1800710.1-1800710.10|共10页
  • 作者

    Yao Shanshan; Cui Jiang; Huang Jian-Qiu; Lu Ziheng; Deng Yang; Chong Woon Gie; Wu Junxiong; Haq Muhammad Ihsan Ul; Ciucci Francesco; Kim Jang-Kyo;

  • 作者单位

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Hong Kong, Hong Kong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    DFT calculations; electrochemical exfoliation; lithium sulfur batteries; polysulfide recycling; Sb2S3 nanosheets;

    机译：DFT计算;电化学剥离;锂硫电池;多硫化物回收;Sb2S3纳米片;

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