郑文姬

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:女

毕业院校:大连理工大学

学位:博士

所在单位:化工海洋与生命学院

办公地点:D01-217

联系方式:0427-2631803

电子邮箱:zhengwenji@dlut.edu.cn

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Highly Efficient Polysulfide Trapping and Ion Transferring within a Hierarchical Porous Membrane Interlayer for High-Energy Lithium-Sulfur Batteries

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论文类型:期刊论文

发表时间:2020-05-26

发表刊物:ACS APPLIED ENERGY MATERIALS

收录刊物:SCIE

卷号:3

期号:5

页面范围:5050-5057

ISSN号:2574-0962

关键字:Li-S batteries; membranes; carbon nanotubes; phase inversion; electrochemistry

摘要:Inserting an interlayer between the sulfur cathode and the separator has been considered as one of the most promising solutions to suppress the shuttle effect of soluble lithium polysulfide intermediates ( LiPSs) in lithium-sulfur (Li-S) batteries. However, previously reported carbon nanotubes (CNTs) or carbon composite-based interlayers can be easily blocked by LiPS adsorption and impede the transmission of lithium ions due to the lack of rationally designed porous structures. Here, we prepared a hierarchical porous Fe3C-C/CNT membrane interlayer with rapid ion-transport macropores and hierarchical polysulfide-trapping mesopores via a convenient and scalable phase inversion approach for high-energy-density Li-S batteries. The rationally designed porous structure of Fe3C-C/CNT interlayers significantly provides a good environment for the fast transportation of Li+ ions and electrons, and it simultaneously effectively restrains the shuttle effect by the chemical adsorption energy of the Fe3C nanoparticles toward soluble LiPSs. As a result, due to the self-supporting (FeC)-C-3-C/CNT interlayer, batteries with high sulfur loading (7.06 mg cm(-2)) and a low ratio of electrolyte to sulfur (5.7 mu L mg(-1)) can exhibit a high areal capacity up to 4.32 mA h cm(-2), achieving high gravimetric specific energy (1560 W h kg-1) and volumetric specific energy (1694 W h L-1). This facile approach of membrane interlayer fabrication and structural design provides a promising future for practical applications of LiS batteries.