期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 21, 期 40, 页码 14140-14145出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201500910
关键词
anode materials; molten-salt route; nickel; nanoparticles; nanoplates
资金
- Creative Research Groups of the National Natural Science Foundation of China [21221061]
Binary metal oxides have been deemed as a promising class of electrode materials for high-performance lithium ion batteries owing to their higher conductivity and electrochemical activity than corresponding monometal oxides. Here, NiFe2O4 nanoplates consisting of nanosized building blocks have been successfully fabricated by a facile, large-scale NaCl and KCl molten-salt route, and the changes in the morphology of NiFe2O4 as a function of the molten-salt amount have been systemically investigated. The results indicate that the molten-salt amount mainly influences the diameter and thickness of the NiFe2O4 nanoplates as well as the morphology of the nanosized building blocks. Cyclic voltammetry (CV) and galvanostatic charge-discharge measurements have been conducted to evaluate the lithium storage properties of the NiFe2O4 nanoplates prepared with a Ni(NO3)(2)/Fe(NO3)(3)/KCl/NaCl molar ratio of 1:2:20:60. A high reversible capacity of 888 mAh g(-1) is delivered over 100 cycles at a current density of 100 mA g(-1). Even at a current density of 5000 mA g(-1), the discharge capacity could still reach 173 mAh g(-1). Such excellent electrochemical performances of the NiFe2O4 nanoplates are contributed to the short Li+ diffusion distance of the nanosized building blocks and the synergetic effect of the Ni2+ and Fe3+ ions.
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