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Ultrafast and Ultrastable Heteroarchitectured Porous Nanocube Anode Composed of CuS/FeS2 Embedded in Nitrogen-Doped Carbon for Use in Sodium-Ion Batteries

Authors
Je, JunhwanLim, HyojunJung, Hyun WookKim, Sang-Ok
Issue Date
2월-2022
Publisher
WILEY-V C H VERLAG GMBH
Keywords
heterostructures; metal sulfide anodes; nanocubes; nitrogen-doped porous carbon; sodium-ion batteries
Citation
SMALL, v.18, no.6
Indexed
SCIE
SCOPUS
Journal Title
SMALL
Volume
18
Number
6
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/140515
DOI
10.1002/smll.202105310
ISSN
1613-6810
Abstract
The enhancement of the structural stability of conversion-based metal sulfides at high current densities remains a major challenge in realizing the practical application of sodium-ion batteries (SIBs). The instability of metal sulfides is caused by the large volume variation and sluggish reaction kinetics upon sodiation/desodiation. To overcome this, herein, a heterostructured nanocube anode composed of CuS/FeS2 embedded in nitrogen-doped carbon (CuS/FeS2@NC) is synthesized. Size- and shape-controlled porous carbon nanocubes containing metallic nanoparticles are synthesized by the two-step pyrolysis of a bimetallic Prussian blue analog (PBA) precursor. The simple sulfurization-induced formation of highly conductive CuS along with FeS2 facilitates sodium-ion diffusion and enhances the redox reversibility upon cycling. The mesoporous carbon structure provides excellent electrolyte impregnation, efficient charge transport pathways, and good volume expansion buffering. The CuS/FeS2@NC nanocube anode exhibits excellent sodium storage characteristics including high desodiation capacity (608 mAh g(-1) at 0.2 A g(-1)), remarkable long-term cycle life (99.1% capacity retention after 300 cycles at 5 A g(-1)), and good rate capability up to 5 A g(-1). The simple, facile synthetic route combined with the rational design of bimetallic PBA nanostructures can be widely utilized in the development of conversion-based metal sulfides and other high-capacity anode materials for high-performance SIBs.
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