Promoting opposite diffusion and efficient conversion of polysulfides in "Trap" FexC-Doped asymmetric porous membranes as integrated electrodes
发表时间：2020-02-18
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- 论文类型：
- 期刊论文
- 第一作者：
- Liu, Yang
- 通讯作者：
- Li, XC; He, GH (reprint author), Dalian Univ Technol, Dept Chem Engn, State Key Lab Fine Chem, Linggong Rd 2, Dalian 116024, Peoples R China.
- 合写作者：
- Li, Xiangcun,Liu, Yi,Kou, Wei,Shen, Weiming,He, Gaohong
- 发表时间：
- 2020-02-15
- 发表刊物：
- CHEMICAL ENGINEERING JOURNAL
- 收录刊物：
- EI、SCIE
- 文献类型：
- J
- 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.
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- 否
