Carbon-Coated Fe-Mn-O Composites as Promising Anode Materials for Lithium-Ion Batteries.

ACS applied materials & interfaces

PubMedID: 24007324

Li T, Wang YY, Tang R, Qi YX, Lun N, Bai YJ, Fan RH. Carbon-Coated Fe-Mn-O Composites as Promising Anode Materials for Lithium-Ion Batteries. ACS Appl Mater Interfaces. 2013;.
Fe-Mn-O composite oxides with various Fe/Mn molar ratios were prepared by a simple coprecipitation method followed by subsequently calcining at 600 °C, and carbon-coated oxides were obtained by pyrolyzing pyrrole at 550 °C. The cycling and rate performance of the oxides as anode materials are greatly associated with the molar ratio. The carbon-coated oxides with a molar ratio of 2:1 exhibit a stable reversible capacity of 651.8 mAh g-1 at a current density of 100 mA g-1 after 90 cycles, and the capacities of 567.7, 501.3, 390.7, and 203.8 mAh g-1 at varied densities of 200, 400, 800, and 1600 mA g-1, respectively. The electrochemical performance is more excellent than that of single Fe3O4 or MnO prepared under the same conditions. The enhanced performance could be ascribed to the smaller particle size of Fe-Mn-O than the individuals, the mutual segregation of alien oxides of Fe3O4 and MnO during delithiation, and alien elements of Fe and Mn during lithiation.