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

Graphene wrapped ordered LiNi_{0. 5}Mn_{1. 5}O₄nanorods 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

LiNi_0.5Mn_1.5O₄nanorodswrappedwithgraphenenanosheets have been prepared and investigatedashigh energy and high powercathodematerialforlithium-ionbatteries. The structural characterization by X-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy indicates the LiNi_0.5Mn_1.5O₄nanorodsprepared from beta-MnO₂nanowires haveorderedspinel structure with P4332 space group. The morphological characterization by scanning electron microscopy and transmission electron microscopy reveals that the LiNi_0.5Mn_1.5O₄nanorodsof 100-200 nm in diameter are well dispersed andwrappedin thegraphenenanosheetsforthe composite. Benefiting from the highly conductive matrix provided bygraphenenanosheets and one-dimensional nanostructure of theorderedspinel, the composite electrode exhibits superior rate capability and cycling stability.Asa result, the LiNi_0.5Mn_1.5O₄-graphenecomposite 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 nanorodcathode. The outstanding performance of the LiNi_0.5Mn_1.5O₄-graphenecomposite makes itpromisingascathodematerialfordeveloping high energy and high powerlithium-ionbatteries.