X. Tang, et al, Sci. Rep. 2015. 5. 11958

2015-7-17 17:11:49

Graphene wrapped ordered LiNi0. 5Mn1. 5O4 nanorods as promising cathode material for lithium-ion batteries

Sci. Rep. 2015. 5. 11958

X. Tang, S. S. Jan, Y. Qian, H. Xia, J. Ni, S. V. Savilov, S. M. Aldoshin

LiNi0.5Mn1.5O4 nanorodswrapped with graphene nanosheets have been prepared and investigated as high energy and high power cathodematerialforlithium-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 promisingascathodematerialfor developing high energy and high power lithium-ion batteries.

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