【摘 要】
：
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 cy
【机 构】
：
School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 6117
论文部分内容阅读
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.
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