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2015 ; 5
(ä): 11958
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gab.com Text
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Graphene wrapped ordered LiNi0 5Mn1 5O4 nanorods as promising cathode material
for lithium-ion batteries
#MMPMID26148558
Tang X
; Jan SS
; Qian Y
; Xia H
; Ni J
; Savilov SV
; Aldoshin SM
Sci Rep
2015[Jul]; 5
(ä): 11958
PMID26148558
show ga
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 ?-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 C, respectively, and shows 94% capacity retention after 200 cycles at
1 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.