Li{sub x}Co{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} electrode materials: Electrochemical and structural studies
- LCME, FST Marrakech, University Cadi Ayyad, BP549, Av. A. Khattabi, Marrakech (Morocco)
- Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Yamazaki 2461, Noda Chiba 278-8510 (Japan)
- Institute for Materials Science, Darmstadt University of Technology, Petersenstraße 23, 64287 Darmstadt (Germany)
Graphical abstract: Evolution of the c{sub hex.}/a{sub hex.} ratio with x in LiCo{sub 1−2x}Mn{sub x}Ni{sub x}O{sub 2} solid solution showing that less Li/Ni disorder is observed for x < 0.4. Highlights: ► LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} is a member of the LiCo{sub 1−2x}Ni{sub x}Mn{sub x}O{sub 2} solid solution. ► Structural refinement of this cathode material shows no Li/Ni disorder. ► The rhombohedral symmetry was preserved upon lithium removal. ► The discharge capacity reached more than 140 mAh/g at 2C rate and 160 mAh/g at 1C. -- Abstract: LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} layered oxide in a member of the LiCo{sub 1−2x}Ni{sub x}Mn{sub x}O{sub 2} solid solution between LiCoO{sub 2} and LiNi{sub 0.5}Mn{sub 0.5}O{sub 2}. Compositions from this solid solution have attracted much attention and have been extensively studied as promising cathode candidates to replace the most popular LiCoO{sub 2} cathode material used in the commercial lithium-ion batteries (LiBs). LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} positive electrode material was prepared via the combustion method followed by a thermal treatment at 900 °C for 12 h. This material was characterized by a high homogeneity and a granular shape. The Rietveld refinement evidenced that the structure of this compound exhibits no Ni/Li disorder revealing that the LiCo{sub 1−2x}Ni{sub x}Mn{sub x}O{sub 2} system presents the ideal structure for LiBs application when x < 0.4. The electrochemical performances of the LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} sample were measured at different current rates in the 2.7–4.5 V potential range. Its discharge capacity reached 178, 161 and 145 mAhg{sup −1} at C/20, 1C and 2C, respectively. Structural changes in LiCo{sub 0.4}Ni{sub 0.3}Mn{sub 0.3}O{sub 2} upon delithiation were studied using ex situ X-ray diffraction. A continuous solid solution with a rhombohedral symmetry was detected in the whole composition range. This structural stability during the cycling combined with the obtained electrochemical features make this material convenient for the LiBs applications.
- OSTI ID:
- 22215173
- Journal Information:
- Materials Research Bulletin, Vol. 47, Issue 8; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electron diffraction and high-resolution electron microscopy studies on layered Li{sub 2−δ}(Mn{sub 1−x}Co{sub x}){sub 1+δ}O{sub 3}
Revealing of the Activation Pathway and Cathode Electrolyte Interphase Evolution of Li-Rich 0.5Li2MnO3·0.5LiNi0.3Co0.3Mn0.4O2 Cathode by in Situ Electrochemical Quartz Crystal Microbalance