分离器(采油)
石墨烯
多硫化物
材料科学
碳化
纳米颗粒
化学工程
电化学
钴
硫黄
电池(电)
储能
纳米孔
纳米技术
电极
化学
电解质
复合材料
冶金
扫描电子显微镜
功率(物理)
物理
物理化学
量子力学
工程类
热力学
作者
Juan Xu,Zheng Lin,Xingrun Huang,Yuan Lei,Chao Chen,Zhan Lin
摘要
Lithium–sulfur (Li–S) battery is one of the promising energy storage systems due to its high theoretical energy density with low cost. The main challenge at present for its commercialization is the polysulfides shuttling, leading to poor cycling performance. Here, we report a facilely prepared metal-organic framework (MOF)-derived nanoporous carbon with embedded cobalt nanoparticles (NPCo/C) for alleviating the polysulfides shuttling. The NPCo/C with large surface area and abundant Co nanoparticles is simply prepared by direct carbonization of a Co-based MOF material, which is combined with graphene to construct a robust membrane as the interlayer (NPCo/C@G) to modify the pristine separator. The NPCo/C@G-modified separator gives the battery good cycling stability (707 mAh g−1 after 300 cycles at 0.5 C) and rate performance (capacity decay rate of 0.18% in 300 cycles at 2 C). Excellent battery performance (620 mAh g−1 after 100 cycles at 0.5 C) is exhibited even under ultra-low loading of NPCo/C@G (0.08 mg cm−2). The superior electrochemical performance is mainly attributed to abundant exposed Co active sites in NPCo/C to immobilize polysulfides and accelerate sulfur redox kinetics as well as excellent electrical conductivity of NPCo/C@G for improved sulfur utilization. This study provides a guidance for designing functional separators for Li–S battery application in the near future.
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