期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 1, 页码 527-537出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b16184
关键词
Fe3O4@NC nanocapsule; self-formed channel; high rate; stability; Li-ion batteries
资金
- National Key Research and Development Program of China [2018YFF0215502]
- Department of Science and Technology of Guangdong [2018A050506005]
- Bureau of Science and Technology of Foshan Municipality [2016AG100S22]
Investigations into conversion-type materials such as transition-metal oxides have dominated in energy-storage systems, especially for lithium ion batteries in recent years. A common understanding of taking account of high energy density and high power density allows us to design reasonable electrodes. In this study, the unique Fe3O4@nitrogen-doped carbon (denoted as Fe3O4@NC) nanocapsule with self-formed channels was synthesized based on a facile hydrothermal-coating-annealing route. With respect to the effect of this rational architecture on lithium-storage performance, excellent behavior (a high reversible capacity of 480 mAh g(-1)) could be maintained at 20 A g(-1) during 1000 cycles, with an average Coulombic efficiency of 99.97%. It also means that such a Fe3O4@NC electrode can meet a fast-charge challenge (end-of-charge within similar to 2 min). By a series of investigations, we certainly considered that uniform carbon coating improved electrical conductivity and acted as a buffer layer to accommodate volume variations of Fe3O4 nanoparticles during cycling. It is more interesting that self-formed channels can effectively shorten the ion diffusion path and provide a necessary space to buffer volume expansion as well. Benefiting from these synergetic advantages, this Fe3O4@NC nanocapsule also delivered outstanding electrochemical performances in full cells.
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