李祥村

个人信息Personal Information

副教授

硕士生导师

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:化工学院

电子邮箱:lixiangcun@dlut.edu.cn

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Promoting opposite diffusion and efficient conversion of polysulfides in "Trap" FexC-Doped asymmetric porous membranes as integrated electrodes

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论文类型:期刊论文

发表时间:2020-02-15

发表刊物:CHEMICAL ENGINEERING JOURNAL

收录刊物:EI、SCIE

卷号:382

ISSN号:1385-8947

关键字:Lithium-sulfur batteries; Asymmetric porous membrane; Electrocatalysis; Chemical adsorption; Opposite diffusion

摘要:The shuttling effect in soluble polysulfides results in a sluggish redox reaction and poor cycling performance of Li-S batteries. Herein, a flexible asymmetric porous carbon membrane doped with iron carbide (FexC) nanoparticles was designed by a facile phase-inversion method to serve as an integrated electrode for high-performance Li-S batteries, replacing the traditional Al foil current collector. The strong Li-N binding of the membranes and Fe-S chemical adsorption of FexC can trap polysulfides and promote their gradual diffusion into the porous carbon membrane on the opposite side of the electrolyte. The unique triple-layer-structured multifunctional membrane is ideal as a Li-S battery electrode. The upper spongy-like pores realize physical confinement of polysulfides and sulfur loading; the hierarchical macropores can accommodate volume strain and provide reservoirs for the opposite diffusion of polysulfides; and the dense conductive lower layer can replace Al foil as a current collector. Furthermore, the electrocatalytic effect of FexC on promoting polysulfide conversion and accelerating redox reaction kinetics ensures a smooth trapping-diffusion-conversion mechanism, which greatly suppresses the shuttle effect. The opposite diffusion and catalytic conversion of this flexible membrane is expected to have significant potential for large-scale production in practical applications.