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N-doped hollow carbon nanoparticles encapsulated fibers derived from ZIF-8 self-sacrificed template for advanced lithium–sulfur batteries
Microporous and Mesoporous Materials ( IF 4.8 ) Pub Date : 2021-02-26 , DOI: 10.1016/j.micromeso.2021.111000
Longsheng Wu , Huijie Hou , Jingping Hu , Bingchuan Liu , Xiaorong Yang , Sijing Chen , Lu Liu , Shaogang Hu , Jiakuan Yang , Sha Liang , Keke Xiao , Shushan Yuan

The facile synthesis of sulfur scaffold with high electrical conductivity and strong polysulfide immobilization capability plays an important role in developing high-performance lithium sulfur batteries. Here a new type of porous N-doped carbon fiber consisting of hollow carbon nanoparticles (9 wt%-CF) is designed as sulfur scaffold through electrospinning and carbonization processes with ZIF-8 and polyacrylonitrile as precursors. The carbon fiber skeleton can provide high electrical conductivity, and interconnected hollow particles provide ample space to host active materials and to immobilize polysulfides. Moreover, the N-doping further improves the interaction between 9 wt%-CF and polysulfides. Consequently, the as-prepared 9 wt%-CF/S cathode delivers an initial discharge capacity of 1524 mAh g−1 at 0.1 C and high capacity retention of 83% after 200 cycles charge/discharge at 0.5 C with a sulfur loading of 1.9 mg cm−2.



中文翻译:

N掺杂空心碳纳米粒子封装的纤维,其衍生自ZIF-8自牺牲模板,用于高级锂硫电池

具有高电导率和强大的多硫化物固定能力的硫支架的简便合成在开发高性能锂硫电池中起着重要作用。在这里,一种新型的由中空碳纳米粒子(9 wt%-CF)组成的新型多孔N掺杂碳纤维,通过以ZIF-8和聚丙烯腈为前体的静电纺丝和碳化工艺设计为硫骨架。碳纤维骨架可以提供高电导率,并且相互连接的中空颗粒提供了足够的空间容纳主体材料并固定多硫化物。而且,N掺杂进一步改善了9wt%-CF与多硫化物之间的相互作用。因此,所制备的9 wt%-CF / S阴极的初始放电容量为1524 mAh g -1 在0.1 C时,在0.5 C下200次循环充电/放电后,硫含量为1.9 mg cm -2时,高容量保持率为83%。

更新日期:2021-03-02
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