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首页> 外文期刊>Advanced Functional Materials >Confining Sulfur in Integrated Composite Scaffold with Highly Porous Carbon Fibers/Vanadium Nitride Arrays for High-Performance Lithium-Sulfur Batteries
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Confining Sulfur in Integrated Composite Scaffold with Highly Porous Carbon Fibers/Vanadium Nitride Arrays for High-Performance Lithium-Sulfur Batteries

机译：用高性能多孔锂碳电池/高多孔碳纤维/氮化钒阵列将硫限制在集成复合支架中

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摘要

Increasing the utilization efficiency of sulfur electrodes and suppressing the "shuttle effect" of intermediate polysulfides are the key challenge for high-performance lithium-sulfur batteries (LSBs). Herein a facile combined strategy is reported to fabricate novel porous carbon fibers/vanadium nitride arrays (PCF/VN) composite scaffold for the storage of sulfur via a facile chemical etching united solvothermal-supercritical fluid method. More active sulfur can be stored in the PCF/VN backbone and dual blocking effects associated with "physical block and chemical absorption" for polysulfides are achieved in the PCF/VN/S integrated electrode. The PCF with highly porous structure provides large space to accommodate active sulfur and possesses cross-linked maze channels to physically immobilize the polysulfide species. The VN nanobelt arrays demonstrate strong ability for chemically anchoring the polysulfides, thus retarding the shuttle effect. Due to the unique structure and dual confining effect, the designed PCF/VN/S electrode shows a high reversible capacity of 1310.8 mA h g(-1) at 0.1 C, an extended cycle life (1052.5 mA h g(-1) after 250 cycles) as well as enhanced rate capability, much better than other counterparts (CF/VN/S, PCF/S, and CF/S). This work opens a new door for fabricating high-performance integrated electrodes for LSBs.
机译：对于高性能锂硫电池（LSB），提高硫电极的利用效率和抑制中间多硫化物的“穿梭效应”是关键挑战。在此，据报道，一种简便的组合策略可通过一种简便的化学蚀刻联合溶剂热超临界流体方法制造新颖的多孔碳纤维/氮化钒阵列（PCF / VN）复合支架，用于硫的存储。更多的活性硫可以存储在PCF / VN主链中，并且在PCF / VN / S集成电极中实现了与多硫化物的“物理阻断和化学吸收”相关的双重阻断作用。具有高度多孔结构的PCF提供了容纳活性硫的大空间，并拥有交联的迷宫通道以物理固定多硫化物。 VN纳米带阵列显示出强大的化学锚定多硫化物的能力，从而阻碍了穿梭效应。由于独特的结构和双重约束效应，设计的PCF / VN / S电极在0.1 C的条件下显示出1310.8 mA hg（-1）的高可逆容量，延长了循环寿命（250次循环后为1052.5 mA hg（-1）） ）以及增强的速率功能，远胜过其他同类产品（CF / VN / S，PCF / S和CF / S）。这项工作为制造用于LSB的高性能集成电极打开了新的大门。

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  • 来源
    《Advanced Functional Materials》 |2018年第38期|1706391.1-1706391.9|共9页
  • 作者

    Zhong Yu; Chao Dongliang; Deng Shengjue; Zhan Jiye; Fang RuYi; Xia Yang; Wang Yadong; Wang Xiuli; Xia Xinhui; Tu Jiangping;

  • 作者单位

    Zhejiang Univ, Sch Mat Sci & Engn, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

    Nanyang Technol Univ, Sch Phys & Math Sci, Singapore 637371, Singapore;

    Zhejiang Univ, Sch Mat Sci & Engn, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Sch Mat Sci & Engn, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ Technol, Hangzhou 310014, Zhejiang, Peoples R China;

    Zhejiang Univ Technol, Hangzhou 310014, Zhejiang, Peoples R China;

    Nanyang Polytech, Sch Engn, 180 Ang Mo Kio Ave 8, Singapore 569830, Singapore;

    Zhejiang Univ, Sch Mat Sci & Engn, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Sch Mat Sci & Engn, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

    Zhejiang Univ, Sch Mat Sci & Engn, Key Lab Adv Mat & Applicat Batteries Zhejiang Pro, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;

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  • 关键词

    cathodes; integrated electrodes; lithium-sulfur batteries; porous carbon fibers; vanadium nitride;

    机译：阴极;集成电极;锂硫电池;多孔碳纤维;氮化钒;

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