微型多孔材料
硫黄
碳化
碳纤维
介孔材料
材料科学
氢氧化钾
化学工程
锂(药物)
无机化学
复合数
锂硫电池
聚吡咯
化学
复合材料
聚合
电极
有机化学
电化学
催化作用
聚合物
扫描电子显微镜
物理化学
内分泌学
冶金
工程类
医学
作者
Zhiwei Guo,Bo Zhang,Dejun Li,Teng Zhao,Paul R. Coxon,Christopher Harris,Rui Hao,Yingjun Liu,Kai Xi,Xifei Li
标识
DOI:10.1016/j.electacta.2017.01.174
摘要
N-doped hierarchical porous carbon was prepared by the carbonization of a polypyrrole precursor and activated using potassium hydroxide. The resulting carbon material has a specific area as high as 3271 m2 g−1 and a hierarchical porous structure consisting of mixed parts microporous (<2 nm) and low-range mesoporous (2–50 nm) volumes with majority of pores less than 3 nm in diameter. Sulfur/carbon composites with 80 wt% and 90 wt% sulfur contents were obtained using a simple wet chemical deposition method. It is found that the sulfur is uniformly dispersed inside the nanopores, which is favorable for both the good utilization of sulfur and the confinement of intermediated soluble lithium polysulfides. N-doping can further enhance the chemical interaction between polar polysulfides and the carbon host. When used as a cathode, this composite with high sulfur content exhibited good cycle and rate performance.
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