催化作用
氧化还原
化学工程
吸附
膜
多硫化物
材料科学
多孔性
电子转移
电解质
化学
纳米技术
无机化学
电极
光化学
物理化学
有机化学
复合材料
生物化学
工程类
作者
Jiao Guo,Haipeng Jiang,Yan Dai,Shenghan Gu,Miao Yu,Xiaobin Jiang,Wenji Zheng,Gaohong He,Xiangcun Li
标识
DOI:10.1016/j.cej.2022.134797
摘要
Sluggish redox kinetics, shuttle effect, poor Li+ conductivity, and large volume change of sulfur limit the practical applications of lithium-sulfur (Li-S) batteries. Herein, we propose the construction of a sandwich-structured interlayer with a membrane supporting layer and two-sided synergistic Co/N-codoped interfaces. The middle supporting layer with hierarchically porous frame and ultrahigh porosity of 90 % is constituted of carbon nanotubes (CNT) as core and N-doped carbon coating as the crosslinked shell, which can improve the conductivity of Li+ and electrons and provide enough space for polysulfide (LiPSs) anchoring and conversion. The two-sided synergistic Co/N-codoped interfaces including Co clusters and N active sites show strong adsorption of S/Li2Sx and exceptionally high catalytic activity. The theoretical calculation demonstrates that the LiPSs are preferentially adsorbed on Co clusters due to the stronger affinity, while the free N active sites can work as transition points for Li+ transfer during the LiPSs conversion and Li2S decomposition processes. In this way, the N active sites with transition capacity and Co clusters with high adsorption and catalytic ability exhibit high-efficient synergistic effect in mitigating the shuttle effect and reducing energy barrier of the redox reaction. Benefit from the hierarchically porous membrane and the two-sided synergistic Co clusters and N sites, high-efficient Li+/electron transport and catalytic activity are achieved simultaneously in Li-S batteries. The proposed strategy has important guiding significance for the design of novel multifunctional interlayers for high-performance Li-S batteries.
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