期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 17, 期 8, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-015-3131-1
关键词
MgCo2O4; Nanostructures; Binder-free; Anode; Lithium-ion battery; Energy conversion
资金
- National Natural Science Foundation of China [21301140, 21061130551]
- Natural Science Foundation of Shaanxi Province [2013JQ2004]
MgCo2O4 nanowires are synthesized for the first time through two-step synthesis method, followed by annealing of the MgCo2O4 precursors. The microstructure and morphology of MgCo2O4 nanowires are examined by powder X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy. MgCo2O4 nanowires give rise to a BET surface area of 45.1 m(2) g(-1) and the adsorption average pore size of 11.5 nm. When tested as an anode for lithium-ion batteries, the MgCo2O4 nanowires electrode exhibit exceptional properties in terms of specific capacity, cycling performance, and rate capacity compared with previously reported Co-based binary metal oxides. For instance, when the current densities increase from 5, 10, 15, and 20 A g(-1), the discharge capacities of the MgCo2O4 nanowires electrode are about 649, 348, 188, and 121 mAh g(-1), respectively. The enhanced electrochemical performance of the MgCo2O4 nanowires can be mainly attributed to the nanostructures which lead to decreased lithium-ion diffusion distances and increased active sites for Li insertion/extraction reactions.
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