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

• Published in: Scientific reports Vol. 5; no. 1; p. 11958
• Main Authors: Tang, Xiao, Jan, S. Savut, Qian, Yanyan, Xia, Hui, Ni, Jiangfeng, Savilov, Serguei V., Aldoshin, Serguei M.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 07.07.2015; Nature Publishing Group
• Subjects: 639/638/161/891; 639/925/357/918/1053; Batteries; Electrodes; Energy; Fourier transforms; Humanities and Social Sciences; Infrared spectroscopy; Lithium; multidisciplinary; Nanotechnology; Raman spectroscopy; Scanning electron microscopy; Science; Spectrum analysis; Transmission electron microscopy; X-ray diffraction
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/srep11958

LiNi 0.5 Mn 1.5 O 4 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 LiNi 0.5 Mn 1.5 O 4 nanorods prepared from β-MnO 2 nanowires have ordered spinel structure with P 4 3 32 space group. The morphological characterization by scanning electron microscopy and transmission electron microscopy reveals that the LiNi 0.5 Mn 1.5 O 4 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 LiNi 0.5 Mn 1.5 O 4 -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 LiNi 0.5 Mn 1.5 O 4 nanorod cathode. The outstanding performance of the LiNi 0.5 Mn 1.5 O 4 -graphene composite makes it promising as cathode material for developing high energy and high power lithium-ion batteries.