title: Carbon-coated Fe-Mn-O composites as promising anode materials for lithium-ion batteries.
abstract: Fe-Mn-O composite oxides with various Fe/Mn molar ratios were prepared by a simple coprecipitation method followed by 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 Fe/Mn molar ratio. The carbon-coated oxides with a molar ratio of 2:1 exhibit a stable reversible capacity of 651.8 mA h 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 mA h g(-1) at varied densities of 200, 400, 800, and 1600 mA g(-1), respectively. The electrochemical performance is superior to 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 heterogeneous oxides of Fe3O4 and MnO during delithiation, and heterogeneous elements of Fe and Mn during lithiation.
authors.affiliation: Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University , Jinan 250061, People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.forename: Yue-Ya
authors.initials: YY
authors.lastname: Wang
authors.forename: Rui
authors.initials: R
authors.lastname: Tang
authors.forename: Yong-Xin
authors.initials: YX
authors.lastname: Qi
authors.forename: Ning
authors.initials: N
authors.lastname: Lun
authors.forename: Yu-Jun
authors.initials: YJ
authors.lastname: Bai
authors.forename: Run-Hua
authors.initials: RH
authors.lastname: Fan