Abstract
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 ∼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.
Original language | English |
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Pages (from-to) | 127-134 |
Number of pages | 8 |
Journal | Chemical Engineering Journal |
Volume | 351 |
DOIs | |
Publication status | Published - 2018 Nov 1 |
Keywords
- Anode
- Lithium ion battery
- MOF
- Nanofiber
- Ni@ZIF-8
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering