nn5b00088_si_001.pdf (8.02 MB)
Design and Synthesis of Bubble-Nanorod-Structured Fe2O3–Carbon Nanofibers as Advanced Anode Material for Li-Ion Batteries
journal contribution
posted on 2015-04-28, 00:00 authored by Jung Sang Cho, Young Jun Hong, Yun Chan KangA structure denoted as a “bubble-nanorod composite” is synthesized by introducing the Kirkendall effect into the electrospinning method. Bubble-nanorod-structured Fe2O3–C composite nanofibers, which are composed of nanosized hollow Fe2O3 spheres uniformly dispersed in an amorphous carbon matrix, are synthesized as the target material. Post-treatment of the electrospun precursor nanofibers at 500 °C under 10% H2/Ar mixture gas atmosphere produces amorphous FeOx–carbon composite nanofibers. Post-treatment of the FeOx–carbon composite nanofibers at 300 °C under air atmosphere produces the bubble-nanorod-structured Fe2O3–C composite nanofibers. The solid Fe nanocrystals formed by the reduction of FeOx are converted into hollow Fe2O3 nanospheres during the further heating process by the well-known Kirkendall diffusion process. The discharge capacities of the bubble-nanorod-structured Fe2O3–C composite nanofibers and hollow bare Fe2O3 nanofibers for the 300th cycles at a current density of 1.0 A g–1 are 812 and 285 mA h g–1, respectively, and their capacity retentions measured from the second cycle are 84 and 24%, respectively. The hollow nanospheres accommodate the volume change that occurs during cycling. The unique structure of the bubble-nanorod-structured Fe2O3–C composite nanofibers results in their superior electrochemical properties by improving the structural stability during long-term cycling.
History
Usage metrics
Categories
Keywords
volume changeFe 2O nanofibersKirkendall effectelectrochemical propertiesFe 2O sphereselectrospinning methodelectrospun precursor nanofiberstarget materialFe 2O nanospherescarbon matrixnanofibers resultsAdvanced Anode MaterialKirkendall diffusion processcapacity retentionsheating processFe nanocrystalsair atmospheredischarge capacities
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC