分离器(采油)
杂原子
材料科学
阻燃剂
电化学
化学工程
吸附
兴奋剂
电导率
纳米颗粒
硫黄
路易斯酸
纳米技术
复合材料
电极
化学
催化作用
有机化学
物理化学
光电子学
工程类
物理
冶金
热力学
戒指(化学)
作者
Na Wu,Junling Wang,Cheng-I Liao,Longfei Han,Lei Song,Yuan Hu,Xiaowei Mu,Yongchun Kan
标识
DOI:10.1016/j.jechem.2021.05.001
摘要
In this work, we have successfully prepared a novel separator modified with N, S co-doped carbon framework (named NSPCF) with confined CoS2 nanoparticles and rooted carbon nanotubes material (named [email protected]2) to apply for high-performance Lithium-Sulfur batteries (Li-S batteries). Robust carbon structure with large specific surface can act as a physical barrier and possess physical adsorption effect on lithium polysulfides (LiPSs). In addition, highly-conductive carbon can improve integral conductivity, leading to the fast charge transport and reaction kinetics. Also, doping heteroatoms could form more active sites to adsorb LiPSs strongly so that modified separator could inhibit the shuttle effect effectively. Moreover, the presence of CoS2 further enhances the ability of modified separator to trap LiPSs owing to the Lewis acid-base action. As a result, the [email protected]2@C-150 battery can deliver initial discharge capacities of 863.0, 776.2, 649.1 and 489.4 mAh g−1 at 0.1, 0.5, 1 and 2C with a high sulfur loading of 2.04 mg cm−2, respectively. Notably, when turning the current density back to 0.1C, its discharge capacity can recover to 1008.7 mAh g−1. In addition, the modified separators exhibit outstanding capacities to restrain the growth of lithium dendrites. It is noteworthy that the flame retardant performances of Li-S batteries are improved dramatically owing to the novel structures of modified separators. This rationally designed separator endows Li-S batteries with higher safety and excellent electrochemical performances, providing a feasible strategy for practical application of Li-S batteries.
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