材料科学
硫黄
化学工程
介孔材料
化学吸附
阴极
电解质
吸附
无机化学
电极
化学
催化作用
有机化学
工程类
物理化学
冶金
作者
Kai Zhang,You Li,Hongyu Wang,Zisheng Zhang,Guihua Liu,Yongguang Zhang
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2021-12-23
卷期号:33 (11): 115405-115405
被引量:7
标识
DOI:10.1088/1361-6528/ac3703
摘要
The development of efficient sulfur host materials to address the shuttle effect issues of lithium polysulfides (LiPSs) is crucial in the lithium-sulfur (Li-S) batteries but still challenging. In the present study, a novel yolk shell structured MgCo-LDH/ZIF-67 composite is designed as Li-S battery cathode. In this composite, the shell layer is MgCo layered double hydroxide constructed by partially etching ZIF-67 nanoparticle by Mg2+, and the core is the unreacted ZIF-67 particle. The unique yolk shell structure not only provides abundant pores for sulfur accommodation, but also facilitates the electrolyte penetration and ion transport. The ZIF-67 core exhibits strong polar adsorption to LiPSs through the Lewis acid-base interactions, and the micropores/mesoporous can further trap LiPSs. Meanwhile, the MgCo-LDH shell exposes enough sulfur-philic sites for enhancing chemisorption and catalyzes LiPSs conversion. As a result, when MgCo-LDH/ZIF-67 is used as sulfur host in the cathode, the cell achieves a high discharge capacity of 1121 mAh g-1at 0.2 C, and an areal capacity of 5.0 mAh cm-2under high sulfur loading of 5.8 mg cm-2. The S/MgCo-LDH/ZIF-67 electrode holds a promising potential for the development of Li-S batteries.
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