In situ formed FeS2@CoS cathode for long cycling life lithium-ion battery

doi:10.1088/1674-1056/abe9ab

Abstract Pyrite FeS₂ exhibits an ultrahigh energy density (1671 W·h·kg^-1, for the reaction of FeS₂+4Li=Fe+2Li₂S) in secondary lithium-ion batteries, but its poor cycling stability, huge volume expansion, the shuttle effect of polysulfides, and slow kinetic properties limit its practical application. In this work, we synthesize a composite structure material CoS on FeS₂ surface (FeS_x@CoS, 1 < x ≤ 2) by using a cobalt-containing MOF to improve its cycle stability. It is found that CoS inhibits the side reactions and adsorbs polysulfides. As a result, the modified FeS₂ shows a higher discharge capacity of 577 mA·h·g^-1 (919 W·h·kg^-1) after 60 cycles than 484 mA·h·g^-1 (778 W·h·kg^-1) of bare pyrite FeS₂. This efficient strategy provides a valuable step toward the realization of high cycling stability FeS₂ cathode materials for secondary lithium-ion batteries and enriches the basic understanding of the influence of FeS₂ interfacial stability on its electrochemical performances.

Keywords: Li-free cathodes pyrite lithium metal batteries first-principles calculation

Received: 17 December 2020
Revised: 29 January 2021
Accepted manuscript online: 25 February 2021

PACS:	82.47.Aa	(Lithium-ion batteries)
	82.45.Fk	(Electrodes)
	31.15.A-	(Ab initio calculations)

Fund: Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. ZYGX2019Z008) and the National Natural Science Foundation of China (Grant No. 52072061).

Corresponding Authors: Liping Wang, Xiaobin Niu
E-mail: lipingwang@uestc.edu.cn;xbniu@uestc.edu.cn

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Xin Wang(王鑫), Bojun Wang(汪博筠), Jiachao Yang(杨家超), Qiwen Ran(冉淇文), Jian Zou(邹剑), Pengyu Chen(陈鹏宇), Li Li(李莉), Liping Wang(王丽平), and Xiaobin Niu(牛晓滨) In situ formed FeS₂@CoS cathode for long cycling life lithium-ion battery 2021 Chin. Phys. B 30 088201

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In situ formed FeS₂@CoS cathode for long cycling life lithium-ion battery

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