期刊
ACS NANO
卷 9, 期 3, 页码 3369-3376出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00760
关键词
yolk-shell structure; iron oxide; iron carbonide; core-shell structure; lithium ion battery
类别
资金
- National Natural Science Foundation of China [21101141, 51173170]
- Program for New Century Excellent Talents in Universities (NCET)
- J. Robert Oppenheimer Distinguished Fellowship
- Open Project Foundation of Key Laboratory of Advanced Energy Materials Chemistry of Nankai University [2015-32]
To well address the problems of large volume change and dissolution of Fe3O4 nanomaterials during Li+ intercalation/extraction, herein we demonstrate a one-step in situ nanospace-confined pyrolysis strategy for robust yolk-shell nanospindles with very sufficient internal void space (VSIVS) for high-rate and long-term lithium ion batteries (LIBs), in which an Fe3O4@Fe3C core@shell nanoparticle is well confined in the compartment of a hollow carbon nanospindle. This particular structure can not only introduce VSIVS to accommodate volume change of Fe3O4 but also afford a dual shell of Fe3C and carbon to restrict Fe3O4 dissolution, thus providing dual roles for greatly improving the capacity retention. As a consequence, Fe3O4@Fe3C-C yolk shell nanospindles deliver a high reversible capadty of 11283 mAh g(-1) at even 500 inA g(-1), excellent high rate capacity (604.8 mAh g(-1) at 2000 mA g(-1)), and prolonged cycling life (maintaining 1120.2 mAh g(-1) at 500 mA g 100 cycles) for LIBs, which are much better than those of Fe3O4@C core@shell nanospindles and Fe3O4 nanoparticles. The present Fe3O4@Fe3C-C yolk shell nanospindles are the most efficient Fe3O4-based anode materials ever reported for LIBs.
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