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

Junhwan Je, Hyojun Lim, Hyun Wook Jung, Sang Ok Kim

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Publication statusAccepted/In press - 2021


  • heterostructures
  • metal sulfide anodes
  • nanocubes
  • nitrogen-doped porous carbon
  • sodium-ion batteries

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)


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