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首页> 外文期刊>Advanced Functional Materials >In Situ Formation of Copper-Based Hosts Embedded within 3D N-Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium-Sulfur Batteries
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In Situ Formation of Copper-Based Hosts Embedded within 3D N-Doped Hierarchically Porous Carbon Networks for Ultralong Cycle Lithium-Sulfur Batteries

机译：原位形成嵌入超长周期锂硫电池的3D N掺杂分层多孔碳网络中的铜基宿主。

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摘要

Lithium-sulfur (Li-S) batteries are promising energy storage systems due to their large theoretical energy density of 2600 Wh kg(-1) and cost effectiveness. However, the severe shuttle effect of soluble lithium polysulfide intermediates (LiPSs) and sluggish redox kinetics during the cycling process cause low sulfur utilization, rapid capacity fading, and a low coulombic efficiency. Here, a 3D copper, nitrogen co-doped hierarchically porous graphitic carbon network developed through a freeze-drying method (denoted as 3D Cu@NC-F) is prepared, and it possesses strong chemical absorption and electrocatalytic conversion activity for LiPSs as highly efficient sulfur host materials in Li-S batteries. The porous carbon network consisting of 2D cross-linked ultrathin carbon nanosheets provides void space to accommodate volumetric expansion upon lithiation, while the Cu, N-doping effect plays a critical role for the confinement of polysulfides through chemical bonding. In addition, after sulfuration of Cu@NC-F network, the in situ grown copper sulfide (CuxS) embedded within CuxS@NC/S-F composite catalyzes LiPSs conversion during reversible cycling, resulting in low polarization and fast redox reaction kinetics. At a current density of 0.1 C, the CuxS@NC/S-F composites' electrode exhibits an initial capacity of 1432 mAh g(-1) and maintains 1169 mAh g(-1) after 120 cycles, with a coulombic efficiency of nearly 100%.
机译：锂硫（Li-S）电池由于其2600 Wh kg（-1）的大理论能量密度和成本效益而成为很有希望的储能系统。但是，在循环过程中，可溶性多硫化锂中间体（LiPS）的严重穿梭效应和缓慢的氧化还原动力学会导致硫利用率低，容量衰减快和库仑效率低。在这里，制备了通过冷冻干燥方法开发的3D铜，氮共掺杂的分层多孔石墨碳网络（称为3D Cu @ NC-F），并且它具有对LiPS高效的强化学吸收和电催化转化活性Li-S电池中的硫基质材料。由2D交联的超薄碳纳米片组成的多孔碳网络提供了空隙空间，以适应锂化时的体积膨胀，而Cu，N掺杂效应对于通过化学键合限制多硫化物起着关键作用。此外，Cu @ NC-F网络硫化后，嵌入在CuxS @ NC / S-F复合材料中的原位生长的硫化铜（CuxS）在可逆循环过程中催化LiPSs转化，导致低极化和快速的氧化还原反应动力学。在0.1 C的电流密度下，CuxS @ NC / SF复合材料的电极表现出的初始容量为1432 mAh g（-1），在120个循环后保持1169 mAh g（-1），库仑效率接近100％ 。

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  • 来源
    《Advanced Functional Materials》 |2018年第39期|1804520.1-1804520.12|共12页
  • 作者

    Yu Qiuhong; Lu Yang; Luo Rongjie; Liu Xianming; Huo Kaifu; Kim Jang-Kyo; He Jun; Luo Yongsong;

  • 作者单位

    Xinyang Normal Univ, Key Lab Microelect & Energy Henan Prov, Nanhu Rd 237, Xinyang 464000, Peoples R China;

    Xinyang Normal Univ, Key Lab Microelect & Energy Henan Prov, Nanhu Rd 237, Xinyang 464000, Peoples R China;

    Xinyang Normal Univ, Key Lab Microelect & Energy Henan Prov, Nanhu Rd 237, Xinyang 464000, Peoples R China;

    Luoyang Normal Univ, Coll Chem & Chem Engn, Jiqing Rd 6, Luoyang 471934, Peoples R China;

    Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan Natl Lab Optoelect, Luoyu Rd 1037, Wuhan 430074, Hubei, Peoples R China;

    Hong Kong Univ Sci & Technol, Dept Mech & Aerosp Engn, Clear Water Bay 999077, Hong Kong, Peoples R China;

    Chinese Acad Sci, Natl Ctr Nanosci & Technol, Bei Yi 11, Beijing 100190, Peoples R China;

    Xinyang Normal Univ, Key Lab Microelect & Energy Henan Prov, Nanhu Rd 237, Xinyang 464000, Peoples R China;

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  • 关键词

    3D carbon networks; catalytic conversion; copper sulfide; Li-S batteries; low polarization;

    机译：3D碳网络催化转化硫化铜锂硫电池低极化;

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