silicon carbon core shell particel synthsus

g −1 at a current density of 1 A g −1 after 300 cycles with a capacity retention of 86%. The reversible capacity remains at 735 mAh. g −1 and the capacity retention is 74% after 100 cycles at a current density of 0.2 A. Electrochemical performance testing shows that the reversible capacity of the pSi-CNF (0.5 h) remains at 1 411 mAh. The CNFs are uniformly coated on the surface of the pSi to form a core-shell structure. Results indicate that the pSi-CNF particle sizes are 5−20 μ m with the diameters of the CNFs being 5−40 nm.

Hybrids of pSi and carbon nanofibers (pSi-CNFs) with a core-shell structure were prepared by catalytic chemical vapor deposition (CVD) using Fe-Ni species as the catalyst and a mixture of CO/H 2/C 2H 4 (volumetric ratio 3∶1∶1) as the reactant for 0.5, 1 and 2 h, and were characterized by SEM, TEM, EDS, XRD, Raman spectroscopy and XPS. Multi-component porous Si-SiO x (pSi) consisting of Si, SiO and SiO 2 was formed by the pretreatment of SiO at 950 ☌ for 3 h in an inert atmosphere (He) using a disproportionation reaction.

Silicon carbon core shell particel synthsus