Indexed by:
Journal Papers
First Author:
Liu, Yang
Correspondence Author:
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.
Co-author:
Li, Xiangcun,Liu, Yi,Kou, Wei,Shen, Weiming,He, Gaohong
Date of Publication:
2020-02-15
Journal:
CHEMICAL ENGINEERING JOURNAL
Included Journals:
EI、SCIE
Document Type:
J
Volume:
382
ISSN No.:
1385-8947
Key Words:
Lithium-sulfur batteries; Asymmetric porous membrane; Electrocatalysis;
Chemical adsorption; Opposite diffusion
Abstract:
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.
Translation or Not:
no
