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

Tang X, Jan SS, Qian Y, Xia H, Ni J, Savilov SV, Aldoshin SM - Sci Rep (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: 1] School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China [2] Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China.

ABSTRACT
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 β-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.

No MeSH data available.


Related in: MedlinePlus

FESEM images of(a) the β-MnO2 nanowires, (b) the LiNi0.5Mn1.5O4 nanorods, (c) the pristine graphene nanosheets, and (d) the LiNi0.5Mn1.5O4-graphene composite.
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f5: FESEM images of(a) the β-MnO2 nanowires, (b) the LiNi0.5Mn1.5O4 nanorods, (c) the pristine graphene nanosheets, and (d) the LiNi0.5Mn1.5O4-graphene composite.

Mentions: The typical morphologies of β-MnO2 nanowires, LiNi0.5Mn1.5O4 nanorods, graphene nanosheets, and LiNi0.5Mn1.5O4-graphene composite are shown in Fig. 5. As shown in Fig. 5a, the β-MnO2 nanowires are about 50–100 nm in diameter and 2-3 μm in length. Figure 5b reveals that the as-synthesized LiNi0.5Mn1.5O4 nanorods well preserve the one-dimensional morphology of the β-MnO2 nanowires. However, the LiNi0.5Mn1.5O4 nanorods have larger diameters of about 100–200 nm and shorter lengths of about 0.5–1 μm, which are probably caused by the phase transition and breaking of β-MnO2 nanowires due to the strain associated with the volume expansion. As shown in Fig. 5c, the prepared graphene nanosheets are corrugated and transparent, well resembling the two-dimensional morphology. LiNi0.5Mn1.5O4-graphene composite shows a laminated morphology (Fig. 5d) with LiNi0.5Mn1.5O4 nanorods well dispersed on the graphene nanosheets without severe aggregation.


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

Tang X, Jan SS, Qian Y, Xia H, Ni J, Savilov SV, Aldoshin SM - Sci Rep (2015)

FESEM images of(a) the β-MnO2 nanowires, (b) the LiNi0.5Mn1.5O4 nanorods, (c) the pristine graphene nanosheets, and (d) the LiNi0.5Mn1.5O4-graphene composite.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4493710&req=5

f5: FESEM images of(a) the β-MnO2 nanowires, (b) the LiNi0.5Mn1.5O4 nanorods, (c) the pristine graphene nanosheets, and (d) the LiNi0.5Mn1.5O4-graphene composite.
Mentions: The typical morphologies of β-MnO2 nanowires, LiNi0.5Mn1.5O4 nanorods, graphene nanosheets, and LiNi0.5Mn1.5O4-graphene composite are shown in Fig. 5. As shown in Fig. 5a, the β-MnO2 nanowires are about 50–100 nm in diameter and 2-3 μm in length. Figure 5b reveals that the as-synthesized LiNi0.5Mn1.5O4 nanorods well preserve the one-dimensional morphology of the β-MnO2 nanowires. However, the LiNi0.5Mn1.5O4 nanorods have larger diameters of about 100–200 nm and shorter lengths of about 0.5–1 μm, which are probably caused by the phase transition and breaking of β-MnO2 nanowires due to the strain associated with the volume expansion. As shown in Fig. 5c, the prepared graphene nanosheets are corrugated and transparent, well resembling the two-dimensional morphology. LiNi0.5Mn1.5O4-graphene composite shows a laminated morphology (Fig. 5d) with LiNi0.5Mn1.5O4 nanorods well dispersed on the graphene nanosheets without severe aggregation.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: 1] School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China [2] Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing 210094, China.

ABSTRACT
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 β-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.

No MeSH data available.


Related in: MedlinePlus