期刊
ACS APPLIED MATERIALS & INTERFACES
卷 5, 期 19, 页码 9470-9477出版社
AMER CHEMICAL SOC
DOI: 10.1021/am402205z
关键词
cycling performance; rate capability; composite oxide; coprecipitation; electrochemical performance; anode material
资金
- Independent Innovation Foundation of Shandong University, IIFSDU [2012ZD004]
- Open Project from State Key Laboratory of Crystal Materials [KF1105]
- National Natural Science Foundation of China [50972076, 51172131]
Fe-Mn-O composite oxides with various Fe/Mn molar ratios were prepared by a simple coprecipitation method followed by calcining at 600 degrees C, and carbon-coated oxides were obtained by pyrolyzing pyrrole at 550 degrees 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.
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