Li_xCo_0.4Ni_0.3Mn_0.3O₂ electrode materials: Electrochemical and structural studies

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• 作者：Abdelfattah Mahmoud^a ; Mayumi Yoshita^b ; Ismael Saadoune^a ; ^{saadoune1@yahoo.fr} ; Joachim Broetz^c ; Kenjiro Fujimoto^b ; Shigeru Ito^b
• 关键词：A. Oxides ; A. Layered compounds ; B. Electrochemical properties ; C. Electrochemical measurments ; C. X-ray diffraction
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：August, 2012
• 卷：47
• 期：8
• 页码：1936-1941
• 文件大小：1276 K

摘要

LiCo_0.4Ni_0.3Mn_0.3O₂ layered oxide in a member of the LiCo_1鈭?xNi_xMn_xO₂ solid solution between LiCoO₂ and LiNi_0.5Mn_0.5O₂. Compositions from this solid solution have attracted much attention and have been extensively studied as promising cathode candidates to replace the most popular LiCoO₂ cathode material used in the commercial lithium-ion batteries (LiBs). LiCo_0.4Ni_0.3Mn_0.3O₂ positive electrode material was prepared via the combustion method followed by a thermal treatment at 900 掳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_1鈭?xNi_xMn_xO₂ system presents the ideal structure for LiBs application when x < 0.4. The electrochemical performances of the LiCo_0.4Ni_0.3Mn_0.3O₂ 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^鈭? at C/20, 1C and 2C, respectively. Structural changes in LiCo_0.4Ni_0.3Mn_0.3O₂ 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.