期刊
CHEMICAL ENGINEERING JOURNAL
卷 351, 期 -, 页码 127-134出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.05.098
关键词
Ni@ZIF-8; MOF; Nanofiber; Lithium ion battery; Anode
资金
- Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) - Ministry of Science, ICT & Future Planning [NRF-2016M1A2A2936760, NRF-2017R1A2B4005639]
We present a uniform rhombohedral Ni@ZnO bimetallic oxide host over carbon nanofibers (CNF) as an anode material for Li-ion batteries. Ni@ZnO was produced by annealing a Ni@zeolitic imidazolate framework (ZIF-8) hierarchically decorated over CNFs. The rationally-designed freestanding composite exhibited promising stability in electrochemical performance. A first reversible capacity of 1051 mA.h.g(-1) was measured at a current density of 100 mA.g(-1), and 88% of this capacity was retained after 100 cycles. We attribute this high capacity retention to the hierarchical structure of the Ni@ZnO-enwrapped carbon framework encapsulating the conductive CNFs, as demonstrated by scanning and transmission electron microscopy. The composite electrode also showed a high specific capacity of similar to 497 mA.h.g(-1) in high-rate testing at 1000 mA.g(-1), because the cage-like framework of the material allowed rapid charge transfer and Li-ion diffusion in the anode.
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