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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. 相似文献
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Monolithic epitaxy and optoelectronic properties of single-crystalline γ-In2Se3 thin films on mica 下载免费PDF全文
The growth of γ-In2Se3 thin films on mica by molecular beam epitaxy is studied. Single-crystalline γ-In2Se3 is achieved at a relatively low growth temperature. An ultrathin β-In2Se3 buffer layer is observed to nucleate and grow through a process of self-organization at initial deposition, which facilitates subsequent monolithic epitaxy of single-crystallineγ-In2Se3 at low temperature. Strong room-temperature photoluminescence and moderate optoelectronic response are observed in the achieved γ-In2Se3 thin films. 相似文献
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