Sandwich-structured nanocomposites of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles as high-performance Li-ion battery anodes
- 353 Downloads
Iron oxides have attracted considerable interest as abundant materials for high-capacity Li-ion battery anodes. However, their fast capacity fading owing to poorly controlled reversibility of the conversion reactions greatly hinders their application. Here, a sandwich-structured nanocomposite of N-doped graphene and nearly monodisperse Fe3O4 nanoparticles were developed as high-performance Li-ion battery anode. N-doped graphene serves as a conducting framework for the self-assembled structure and controls Fe3O4 nucleation through the interaction of N dopants, surfactant molecules, and iron precursors. Fe3O4 nanoparticles were well dispersed with a uniform diameter of ~15 nm. The unique sandwich structure enables good electron conductivity and Li-ion accessibility and accommodates a large volume change. Hence, it delivers good cycling reversibility and rate performance with a capacity of ~1,227 mA·h·g–1 and 96.8% capacity retention over 1,000 cycles at a current density of 3 A·g–1. Our work provides an ideal structure design for conversion anodes or other electrode materials requiring a large volume change.
KeywordsN-doped graphene iron oxides self-assembly Li-ion battery density functional theory
Unable to display preview. Download preview PDF.
The authors would like to acknowledge financial supports from the National High-tech R&D Program of China (863 Program) (Nos. 2013AA032002 and 2015AA034601), China Iron & Steel Research Institute Group Foundation (No. SHI11AT0540A) and Advance Technology & Materials Co., Ltd Innovation Foundations (No. 2013JA02PYF).
- Hu, J. T.; Zheng, J. X.; Tian, L. L.; Duan, Y. D.; Lin, L. P.; Cui, S. H.; Peng, H.; Liu, T. C.; Guo, H.; Wang, X. W. et al. A core–shell nanohollow-γ-Fe2O3@graphene hybrid prepared through the kirkendall process as a high performance anode material for lithium ion batteries. Chem. Commun. 2015, 51, 7855–7858.CrossRefGoogle Scholar
- Song, J. X.; Xu, T.; Gordin, M. L.; Zhu, P. Y.; Lv, D. P.; Jiang, Y. B.; Chen, Y. S.; Duan, Y. H.; Wang, D. H. Nitrogendoped mesoporous carbon promoted chemical adsorption of sulfur and fabrication of high-areal-capacity sulfur cathode with exceptional cycling stability for lithium-sulfur batteries. Adv. Funct. Mater. 2014, 24, 1243–1250.CrossRefGoogle Scholar
- Yu, X. B.; Qu, B.; Zhao, Y.; Li, C. Y.; Chen, Y. J.; Sun, C. W.; Gao, P.; Zhu, C. L. Growth of hollow transition metal (Fe, Co, Ni) oxide nanoparticles on graphene sheets through kirkendall effect as anodes for high-performance lithium-ion batteries. Chem.—Eur. J. 2016, 22, 1638–1645.CrossRefGoogle Scholar
- Chen, P.; Xiao, T. Y.; Qian, Y. H.; Li, S. S.; Yu, S. H. A nitrogen-doped graphene/carbon nanotube nanocomposite with synergistically enhanced electrochemical activity. Adv. Mater. 2013, 25, 3192–3196.Google Scholar
- Li, L.; Kovalchuk, A.; Fei, H. L.; Peng, Z. W.; Li, Y. L.; Kim, N. D.; Xiang, C. S.; Yang, Y.; Ruan, G. D.; Tour, J. M. Enhanced cycling stability of lithium-ion batteries using graphene-wrapped Fe3O4-graphene nanoribbons as anode materials. Adv. Energy Mater. 2015, 5, 1500171.CrossRefGoogle Scholar
- Segall, M. D.; Philip, J. D. L.; Probert, M. J.; Pickard, C. J.; Hasnip, P. J.; Clark, S. J.; Payne, M. C. First-principles simulation: Ideas, illustrations and the CASTEP code. J. Phys.: Condens. Matter 2002, 14, 2717–2744.Google Scholar