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Erschienen in:
24.04.2017
Preparation of yolk–shell Fe3O4@N-doped carbon nanocomposite particles as anode in lithium ion batteries
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 16/2017
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Abstract
The yolk–shell-structured Fe3O4 nanocomposite particles (Fe3O4@Void@C–N NPs) with Fe3O4 as the yolk and N-doped carbon as the shell were prepared by using melamine formaldehyde resin as the N and C sources. When used as anode material for lithium ion battery, the yolk–shell structure could not only afford adequate void to accommodate the large volume change during charge/discharge process but also improve structural stability and electrical conductivity. The anode material demonstrated superior long-term and high-rate performance because of the novel structure and the N-doped carbon shell with mesopore. Thus, Fe3O4@Void@C–N NPs exhibited a high reversible capacity of 1530 mAh g−1 after 300 cycles at a current density of 500 mA g−1, which were approximately 1.5 and 6 times higher than Fe3O4@C–N NPs and pure Fe3O4 particles, respectively. Even at the higher current density of 2000 mA g−1, the reversible capacity remained at 651 mAh g−1 after 500 cycles.