微型多孔材料
电解质
材料科学
碳纤维
硫黄
碳化
化学工程
电池(电)
无机化学
锂(药物)
化学
复合数
电极
复合材料
冶金
内分泌学
工程类
物理化学
物理
功率(物理)
医学
量子力学
扫描电子显微镜
作者
Lei Hu,Yue Lu,Xiaona Li,Jianwen Liang,Tao Huang,Yongchun Zhu,Yitai Qian
出处
期刊:Small
[Wiley]
日期:2017-01-06
卷期号:13 (11)
被引量:63
标识
DOI:10.1002/smll.201603533
摘要
Developing appropriate sulfur cathode materials in carbonate‐based electrolyte is an important research subject for lithium‐sulfur batteries. Although several microporous carbon materials as host for sulfur reveal the effect, methods for producing microporous carbon are neither easy nor well controllable. Moreover, due to the complexity and limitation of microporous carbon in their fabrication process, there has been rare investigation of influence on electrochemical behavior in the carbonate‐based electrolyte for lithium‐sulfur batteries by tuning different micropore size(0–2 nm) of carbon host. Here, we demonstrate an immediate carbonization process, self‐activation strategy, which can produce microporous carbon for a sulfur host from alkali‐complexes. Besides, by changing different alkali‐ion in the previous complex, the obtained microporous carbon exhibits a major portion of ultramicropore (<0.7 nm, from 54.9% to 25.8%) and it is demonstrated that the micropore structure of the host material plays a vital role in confining sulfur molecule. When evaluated as cathode materials in a carbonate‐based electrolyte for Li‐S batteries, such microporous carbon/sulfur composite can provide high reversible capacity, cycling stability and good rate capability.
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