One-step preparation of six-armed Fe_3O_4 dendrites with carbon coating applicable for anode material of lithium-ion battery

摘要

Six-armed Fe_3O_4 dendrites with carbon coating were synthesized by a simple one-step reaction between ferrocene and urea at 550 °C. Electron microscopy examinations indicate the formation of large numbers of Fe_3O_4 dendrites with mutually vertical arms and uniform carbon shells. Electrochemical measurement demonstrates that the dendrites using as anode materials for lithium-ion battery exhibit an initial capacity of 658 mAh g~(-1) and a reversible capacity of 473 mAh g~(-1) after 100 cycles at a rate of C/10, as well as a high cycling efficiency of 97% after the forth cycle. The formation mechanism of the six-armed dendrites was also discussed.