多硫化物
咪唑酯
硫黄
吸附
硼
锂(药物)
锂硫电池
无机化学
材料科学
沸石咪唑盐骨架
纳米技术
化学
化学工程
冶金
电化学
有机化学
金属有机骨架
电解质
物理化学
内分泌学
工程类
医学
电极
作者
Soumyodip Banerjee,Han Xu,Maxime A. Siegler,Elisa M. Miller,Nicholas M. Bedford,Brandon C. Bukowski,V. Sara Thoi
标识
DOI:10.1021/acs.chemmater.2c02324
摘要
The “polysulfide shuttle,” a process initiated by the dissolution of polysulfides, is recognized to be one of the major failure mechanisms of lithium–sulfur (Li–S) batteries. Much research effort has been dedicated toward efficient cathode additives and host materials to suppress the leaching of polysulfide species. Herein, we report a new 2D metal–organic framework constituted by a tritopic ligand, boron imidazolate ([BH(Im)3]−, Im = imidazole), and Co2+ ions for lithium polysulfide adsorption. The cobalt imidazolate framework (CoN6-BIF) contains octahedrally coordinated Co centers that form two-dimensional layers in the a,b plane. Composite cathodes containing CoN6-BIF exhibited high sulfur utilization and capacity retention, resulting in improved specific capacity and cycle life compared to sulfur/carbon controls. Density functional theory (DFT) calculations suggest that CoN6-BIF linkers are rotationally flexible, allowing the framework to accommodate polysulfide in the expanded pores. This unusual property of BIFs opens up new avenues for exploring flexible metal–organic frameworks (MOFs) and their applications to energy storage.
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