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首页> 外文期刊>Advanced energy materials >Freestanding Flexible Li2S Paper Electrode with High Mass and Capacity Loading for High-Energy Li-S Batteries
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Freestanding Flexible Li2S Paper Electrode with High Mass and Capacity Loading for High-Energy Li-S Batteries

机译：具有高质量和容量负载能力的独立式柔性Li2S纸电极，用于高能Li-S电池

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摘要

Lithium-sulfur (Li-S) batteries are a very appealing power source with extremely high energy density. But the use of a metallic-Li anode causes serious safety hazards, such as short-circuiting and explosion of the cells. Replacing a sulfur cathode with a fully-lithiated lithium sulfide (Li2S) to pair with metallic-Li-free high-capacity anodes paves a feasible way to address this issue. However, the practical utility of Li2S cathodes faces the challenges of poor conductivity, sluggish activation process, and high sensitivity to moisture and oxygen that make electrode production more difficult than dealing with sulfur cathodes. Here, an efficient but low-cost strategy for easy production of freestanding flexible Li2S-based paper electrodes with very high mass and capacity loading in terms of in situ carbonthermal reduction of Li2SO4 by electrospinning carbon is reported. This chemistry enables high loading but strong affinity of ultrafine Li2S nanoparticles in a freestanding conductive carbon-nanofiber network, meanwhile greatly reducing the manufacturing complexity and cost of Li2S cathodes. Benefiting from enhanced structural stability and reaction kinetics, the areal specific capacities of such cathodes can be significantly boosted with less sacrificing of high-rate and cycling capability. This unique Li2S-cathode design can be directly applied for constructing metallic-Li-free or flexible Li-S batteries with high-energy density.
机译：锂硫（Li-S）电池是一种非常吸引人的电源，具有极高的能量密度。但是，使用金属锂阳极会导致严重的安全隐患，例如电池短路和爆炸。用完全锂化的硫化锂（Li2S）代替硫阴极以与无金属锂的高容量阳极配对，为解决此问题提供了一种可行的方法。然而，Li 2 S阴极的实际应用面临着导电性差，活化过程缓慢以及对水分和氧气的高敏感性的挑战，这使得电极的生产比处理硫阴极更加困难。在此，报告了一种有效但低成本的策略，用于通过静电纺丝原位碳热还原Li2SO4，从而轻松生产具有非常高的质量和容量负载的独立式柔性Li2S基纸电极。这种化学性质使超细Li2S纳米粒子在独立的导电碳-纳米纤维网络中具有高负载量但具有很强的亲和力，同时大大降低了Li2S阴极的制造复杂性和成本。得益于增强的结构稳定性和反应动力学，可以在不牺牲高速率和循环能力的情况下显着提高此类阴极的面积比容量。这种独特的Li2S阴极设计可直接应用于构建高能量密度的无锂金属或柔性Li-S电池。

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  • 来源
    《Advanced energy materials》 |2017年第17期|1700018.1-1700018.10|共10页
  • 作者

    Yu Mingliang; Wang Zhiyu; Wang Yuwei; Dong Yanfeng; Qiu Jieshan;

  • 作者单位

    Dalian Univ Technol, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Sch Chem Engn,PSU DUT Joint Ctr Energy Res, Dalian 116024, Peoples R China;

    Dalian Univ Technol, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Sch Chem Engn,PSU DUT Joint Ctr Energy Res, Dalian 116024, Peoples R China;

    Dalian Univ Technol, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Sch Chem Engn,PSU DUT Joint Ctr Energy Res, Dalian 116024, Peoples R China;

    Dalian Univ Technol, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Sch Chem Engn,PSU DUT Joint Ctr Energy Res, Dalian 116024, Peoples R China;

    Dalian Univ Technol, State Key Lab Fine Chem, Liaoning Key Lab Energy Mat & Chem Engn, Sch Chem Engn,PSU DUT Joint Ctr Energy Res, Dalian 116024, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    freestanding flexible electrodes; high capacity; high mass loading; lithium-sulfur batteries; lithium sulfide;

    机译：独立式柔性电极;高容量;高负荷;锂硫电池;硫化锂;

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