Je, Junhwan Lim, Hyojun Jung, Hyun Wook Kim, Sang-Ok 2024-01-19T13:01:01Z 2024-01-19T13:01:01Z 2022-01-10 2022-02 1613-6810 https://pubs.kist.re.kr/handle/201004/115809 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. English Wiley - V C H Verlag GmbbH & Co. Ultrafast and Ultrastable Heteroarchitectured Porous Nanocube Anode Composed of CuS/FeS2 Embedded in Nitrogen-Doped Carbon for Use in Sodium-Ion Batteries Article 10.1002/smll.202105310 1 Small, v.18, no.6 Small 18 6 N scie scopus 000724832000001 2-s2.0-85120429837 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article PRUSSIAN BLUE PERFORMANCE FES2 NANOTUBES CUS CONVERSION SYNTHESIZE ELECTRODE nitrogen-doped porous carbon sodium-ion batteries heterostructures metal sulfide anodes nanocubes