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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.

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(a–c) TEM and HRTEM images of the bare LiNi0.5Mn1.5O4 nanorods. (d–f) TEM and HRTEM images of the LiNi0.5Mn1.5O4-graphene composite.
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f6: (a–c) TEM and HRTEM images of the bare LiNi0.5Mn1.5O4 nanorods. (d–f) TEM and HRTEM images of the LiNi0.5Mn1.5O4-graphene composite.

Mentions: Figure 6a,b show the TEM images of the LiNi0.5Mn1.5O4 nanorods with low and high magnifications, respectively, revealing the single crystalline feature of the nanorods. The interplanar spacing determined by the HRTEM image in Fig. 6c is about 0.48 nm, which is consistent with the (111) planes of LiNi0.5Mn1.5O4 spinels. For the LiNi0.5Mn1.5O4-graphene composite, Fig. 6d,e clearly reveal that the LiNi0.5Mn1.5O4 nanorods are well distributed and wrapped in the transparent graphene nanosheets. The HRTEM image in Fig. 6f shows a clear interface between one LiNi0.5Mn1.5O4 nanorod and one graphene sheet, indicating good adhesion and close contact between the two components in the composite. The interplanar spacing of about 0.48 nm shown in Fig. 6f is also attributed to the (111) planes of the spinel. The uniform LiNi0.5Mn1.5O4-graphene heterostructure can be attributed to the facile chemical mixing method. Initially, the mortar grinding can effectively separate the LiNi0.5Mn1.5O4 nanorods from aggregation. Afterward, the ultrasonication and the continuous stirring facilitate the uniform nanorods distribution in the graphene matrix, resulting the graphene wrapped LiNi0.5Mn1.5O4 nanorods. The graphene content was determined to be about 4.7 wt% by TGA measurement (Fig. S2, Supporting Information).


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)

(a–c) TEM and HRTEM images of the bare LiNi0.5Mn1.5O4 nanorods. (d–f) TEM and HRTEM images of the LiNi0.5Mn1.5O4-graphene composite.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f6: (a–c) TEM and HRTEM images of the bare LiNi0.5Mn1.5O4 nanorods. (d–f) TEM and HRTEM images of the LiNi0.5Mn1.5O4-graphene composite.
Mentions: Figure 6a,b show the TEM images of the LiNi0.5Mn1.5O4 nanorods with low and high magnifications, respectively, revealing the single crystalline feature of the nanorods. The interplanar spacing determined by the HRTEM image in Fig. 6c is about 0.48 nm, which is consistent with the (111) planes of LiNi0.5Mn1.5O4 spinels. For the LiNi0.5Mn1.5O4-graphene composite, Fig. 6d,e clearly reveal that the LiNi0.5Mn1.5O4 nanorods are well distributed and wrapped in the transparent graphene nanosheets. The HRTEM image in Fig. 6f shows a clear interface between one LiNi0.5Mn1.5O4 nanorod and one graphene sheet, indicating good adhesion and close contact between the two components in the composite. The interplanar spacing of about 0.48 nm shown in Fig. 6f is also attributed to the (111) planes of the spinel. The uniform LiNi0.5Mn1.5O4-graphene heterostructure can be attributed to the facile chemical mixing method. Initially, the mortar grinding can effectively separate the LiNi0.5Mn1.5O4 nanorods from aggregation. Afterward, the ultrasonication and the continuous stirring facilitate the uniform nanorods distribution in the graphene matrix, resulting the graphene wrapped LiNi0.5Mn1.5O4 nanorods. The graphene content was determined to be about 4.7 wt% by TGA measurement (Fig. S2, Supporting Information).

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