Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Fe3C Decorated Folic Acid-Derived Graphene-Like Carbon as Polysulfide Catalyst for High-Performance Lithium-Sulfur Battery

Version 1 : Received: 10 April 2023 / Approved: 10 April 2023 / Online: 10 April 2023 (05:01:50 CEST)

A peer-reviewed article of this Preprint also exists.

Lin, Z.; Feng, J.; Liu, W.; Yin, L.; Chen, W.; Shi, C.; Song, J. Fe3C-Decorated Folic Acid-Derived Graphene-like Carbon-Modified Separator as a Polysulfide Barrier for High-Performance Lithium-Sulfur Batteries. Batteries 2023, 9, 296. Lin, Z.; Feng, J.; Liu, W.; Yin, L.; Chen, W.; Shi, C.; Song, J. Fe3C-Decorated Folic Acid-Derived Graphene-like Carbon-Modified Separator as a Polysulfide Barrier for High-Performance Lithium-Sulfur Batteries. Batteries 2023, 9, 296.

Abstract

Lithium-sulfur (Li-S) battery has been regarded as an important candidate for the next-generation energy storage system due to its high theoretical capacity (1675 mAh g-1) and high energy density (2600 Wh kg-1). However, the shuttle effect of polysulfide seriously affects the cycling stability of the Li-S battery. Here, a novel Fe3C decorated folic acid-derived graphene-like N-doped carbon sheet (Fe3C@N-CS) was successfully prepared as the polysulfide catalyst to modify the separator of Li-S battery. The porous layered structures can successfully capture polysulfide as a physical barrier, and the encapsulated Fe3C catalyst can effectively trap and catalyze the conversion of polysulfide, thus accelerating the redox reaction kinetics. Together with the highly conductive networks, the cell with Fe3C@N-CS modified separator evinces superior cycling stability with 0.06% capacity decay per cycle at 1 C rate over 500 cycles and excellent specific capacity with an initial capacity of 1260 mAh g-1 at 0.2 C. Besides, at a high sulfur loading of 4.0 mg cm-2, the batteries also express superb cycle stability and rate performance.

Keywords

lithium-sulfur batteries; Fe3C; 2D materials; shuttle effect; catalyst

Subject

Chemistry and Materials Science, Electrochemistry

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