分离器(采油)
多硫化物
阳极
聚丙烯
电解质
锂硫电池
化学工程
材料科学
储能
热稳定性
硫黄
化学
电极
复合材料
冶金
热力学
物理
工程类
物理化学
功率(物理)
量子力学
作者
Yunge Fan,Zhihui Niu,Fei Zhang,Rui Zhang,Yu Zhao,Guang Lü
出处
期刊:ACS omega
[American Chemical Society]
日期:2019-06-13
卷期号:4 (6): 10328-10335
被引量:56
标识
DOI:10.1021/acsomega.9b00884
摘要
The lithium-sulfur battery is one of the most promising battery technologies with high energy density that exceeds the presently commercialized ones. The shuttle effect caused by the migration of soluble polysulfides to the lithium anode is known as one of the crucial issues that prevent the Li-S batteries from practical application. Modification of the separator is regarded as a convenient yet efficient strategy to alleviate the shuttle effect. In this report, we use a thermally stable and chemically robust metal-organic framework (MOF), UiO-66, as a physical and chemical barrier for soluble polysulfides to functionalize the commercial polypropylene separator. The Li-S cell assembled with such a separator shows a significantly improved cycling stability with an average specific capacity of ca. 720 mA h g-1 at a current rate of 0.5 C for 500 cycles. Experimental and theoretical investigations indicate that the cell performance enhancement results from the physical restriction of the MOF barrier layer and strong chemical interaction between UiO-66 and polysulfides. The excellent thermal stability and chemical robustness (in acid/alkali solutions, conventional organic solvents, and polysulfide electrolytes) of UiO-66 make it highly competitive among various materials developed for separator modification in Li-S batteries.
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