Аннотация:
Carbon encapsulated Fe2O3 nanoparticles (C@Fe2O3) were successfully synthesized via
a facile and environmentally friendly hydrothermal method and prototyped in anode materials
for sodium ion batteries (SIBs). High-resolution transmission and scanning electronic microscopy
observations exhibited the formation of a highly core-shelled C@Fe2O3 composite consisting of carbon
layers coated onto uniform Fe2O3 nanoparticles with a median diameter of 46.1 nm. This core-shell
structure can repress the aggregation of Fe2O3 nanoparticles, preventing the harsh volume change of
the electrode, enhancing the electric conductivity of the active materials, and promoting Na-ion
transformation during cycling. The electrochemical performances of the C@Fe2O3 composite,
as anodes for SIBs, retained a reversible capacity of 305 mAh g1 after 100 cycles at 50 mA g1
and exhibited an excellent cyclability at various current densities due to the synergistic effect between
the carbon layers and Fe2O3. These results suggest that C@Fe2O3 composites present much potential
as anode materials for rechargeable SIBs