Atomically Dispersed Fe-N4 Sites and Fe3C Particles Catalyzing Polysulfides Conversion in Li-S Batteries

doi:10.1007/s40242-022-2222-7

Chemical Research in Chinese Universities ›› 2022, Vol. 38 ›› Issue (5): 1232-1238.doi: 10.1007/s40242-022-2222-7

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Atomically Dispersed Fe-N₄ Sites and Fe₃C Particles Catalyzing Polysulfides Conversion in Li-S Batteries

CHEN Weijie¹, XIA Huicong¹, GUO Kai¹, JIN Wangzhe¹, DU Yu¹, YAN Wenfu^1,2, QU Gan¹, ZHANG Jianan¹

1. College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, P. R. China;
2. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China

Received:2022-06-30 Online:2022-10-01 Published:2022-10-08
Contact: ZHANG Jianan, QU Gan E-mail:zjn@zzu.edu.cn;gqu@zzu.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (Nos.22109140, 21875221, and 22075223) and the Project of the Distinguished Young Scholars Innovation Team of Zhengzhou University, China(No.32320275).

Abstract

Abstract: Lithium-sulfur(Li-S) batteries have been puzzled by the “shuttle effect”. In the recent years, catalytic materials present a huge potential for solving this problem. However, the exploitation for catalytic activity was still challenging in Li-S batteries. In this article, we put forward a single atom catalyst (SAC) of FeN₄ coupled with Fe₃C on the N-doped carbon (FeN₄/Fe₃C@NC) by one-step pyrolysis method. The FeN₄ and Fe₃C synergistically catalyze the polysulfides conversion when the N-doped carbon provides the high conductive three-dimensional skeleton in Li-S batteries. As a result, the FeN₄/Fe₃C@NC shows a specific capacity of 1100 mA·h/g at 0.2 C(1 C=1675 mA/g). In addition, the FeN₄/Fe₃C@NC maintains 99.01% of the pristine specific capacity after 100 cycles at 0.5 C, indicating the improved electrochemical performance in Li-S batteries. This work sheds new lights on the design of engineering catalysts for developing high-performance Li-S batteries.

Key words: FeN₄, Fe₃C, Li-S battery, Shuttle effect

CHEN Weijie, XIA Huicong, GUO Kai, JIN Wangzhe, DU Yu, YAN Wenfu, QU Gan, ZHANG Jianan. Atomically Dispersed Fe-N₄ Sites and Fe₃C Particles Catalyzing Polysulfides Conversion in Li-S Batteries[J]. Chemical Research in Chinese Universities, 2022, 38(5): 1232-1238.

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Atomically Dispersed Fe-N₄ Sites and Fe₃C Particles Catalyzing Polysulfides Conversion in Li-S Batteries

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