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首页> 外文期刊>Advanced Functional Materials >The Fusion of Imidazolium-Based Ionic Polymer and Carbon Nanotubes: One Type of New Heteroatom-Doped Carbon Precursors for High-Performance Lithium-Sulfur Batteries
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The Fusion of Imidazolium-Based Ionic Polymer and Carbon Nanotubes: One Type of New Heteroatom-Doped Carbon Precursors for High-Performance Lithium-Sulfur Batteries

机译：咪唑基离子聚合物和碳纳米管的融合：一种新型的高性能锂硫电池杂原子掺杂碳前驱体

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摘要

Rational design of sulfur host materials with high electrical conductivity and strong polysulfides (PS) confinement is indispensable for high-performance lithium-sulfur (Li-S) batteries. This study presents one type of new polymer material based on main-chain imidazolium-based ionic polymer (ImIP) and carbon nanotubes (CNTs); the polymer composites can serve as a precursor of CNT/NPC-300, in which close coverage and seamless junction of CNTs by N-doped porous carbon (NPC) form a 3D conductive network. CNT/NPC-300 inherits and strengthens the advantages of both high electrical conductivity from CNTs and strong PS entrapping ability from NPC. Benefiting from the improved attributes, the CNT/NPC-300-57S electrode shows much higher reversible capacity, rate capability, and cycling stability than NPC-57S and CNTs-56S. The initial discharge capacity of 1065 mA h g(-1) is achieved at 0.5 C with the capacity retention of 817 mA h g(-1) over 300 cycles. Importantly, when counter bromide anion in the composite of CNTs and ImIP is metathesized to bis(trifluoromethane sulfonimide), heteroatom sulfur is cooperatively incorporated into the carbon hosts, and the surface area is increased with the promotion of micropore formation, thus further improving electrochemical performance. This provides a new method for optimizing porous properties and dopant components of the cathode materials in Li-S batteries.
机译：对于高性能锂硫（Li-S）电池，合理设计具有高电导率和强聚硫（PS）限制的硫主体材料是必不可少的。这项研究提出了一种基于主链咪唑基离子聚合物（ImIP）和碳纳米管（CNTs）的新型聚合物材料。该聚合物复合材料可以用作CNT / NPC-300的前体，其中CNT的紧密覆盖和N掺杂多孔碳（NPC）的无缝连接形成3D导电网络。 CNT / NPC-300继承并增强了CNT的高电导率和NPC强大的PS截留能力的优势。得益于改进的属性，与NPC-57S和CNTs-56S相比，CNT / NPC-300-57S电极具有更高的可逆容量，倍率能力和循环稳定性。在0.5 C的温度下，初始放电容量为1065 mA h g（-1），在300个循环中保持了817 mA h g（-1）的容量。重要的是，当CNT和ImIP的复合物中的对溴阴离子被复分解为双（三氟甲烷磺酰亚胺）时，杂原子硫会协同结合到碳主体中，表面积会随着微孔形成的增加而增加，从而进一步提高电化学性能。这为优化Li-S电池正极材料的多孔性和掺杂剂成分提供了一种新方法。

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  • 来源
    《Advanced Functional Materials》 |2017年第44期|1703936.1-1703936.11|共11页
  • 作者

    Pan Hui; Cheng Zhibin; Xiao Zhubing; Li Xiaoju; Wang Ruihu;

  • 作者单位

    Fujian Normal Univ, Coll Mat Sci & Engn, Fujian Key Lab Polymer Mat, Fuzhou 350007, Fujian, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;

    Fujian Normal Univ, Coll Mat Sci & Engn, Fujian Key Lab Polymer Mat, Fuzhou 350007, Fujian, Peoples R China;

    Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    carbon materials; imidazolium; ionic polymers; lithium-sulfur batteries; shuttle effect;

    机译：碳材料;咪唑鎓;离子聚合物;锂硫电池;穿梭效应;

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