期刊
SCIENTIFIC REPORTS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep11958
关键词
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资金
- Natural Science Foundation of Jiangsu Province [BK20131349]
- National Natural Science Foundation of China [U1407106, 51302181]
- China Postdoctoral Science Foundation [2013M530258, 2014M551647]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1202001B]
- Russian Scientific Fund [14-43-00072]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- QingLan Project of Jiangsu Province
- Russian Science Foundation [14-43-00072] Funding Source: Russian Science Foundation
LiNi0.5Mn1.5O4 nanorods wrapped with graphene nanosheets have been prepared and investigated as high energy and high power cathode material for lithium-ion batteries. The structural characterization by X-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy indicates the LiNi0.5Mn1.5O4 nanorods prepared from beta-MnO2 nanowires have ordered spinel structure with P4332 space group. The morphological characterization by scanning electron microscopy and transmission electron microscopy reveals that the LiNi0.5Mn1.5O4 nanorods of 100-200 nm in diameter are well dispersed and wrapped in the graphene nanosheets for the composite. Benefiting from the highly conductive matrix provided by graphene nanosheets and one-dimensional nanostructure of the ordered spinel, the composite electrode exhibits superior rate capability and cycling stability. As a result, the LiNi0.5Mn1.5O4-graphene composite electrode delivers reversible capacities of 127.6 and 80.8 mAh g(-1) at 0.1 and 10 degrees C, respectively, and shows 94% capacity retention after 200 cycles at 1 degrees C, greatly outperforming the bare LiNi0.5Mn1.5O4 nanorod cathode. The outstanding performance of the LiNi0.5Mn1.5O4-graphene composite makes it promising as cathode material for developing high energy and high power lithium-ion batteries.
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