Details

Autor(en) / Beteiligte

• Xin Wang
• Bojun Wang
• Jiachao Yang
• Qiwen Ran
• Jian Zou
• Pengyu Chen
• Li Li
• Liping Wang
• Xiaobin Niu

Titel

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

Ist Teil von

• 中国物理B（英文版）, 2021-07, Vol.30 (8), p.604-610

Ort / Verlag

School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,China%School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,China

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 (FeSx@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.