On the LiNi0.2Mn0.2Co0.6O2 positive electrode material |
| |
Authors: | Yassine Bentaleb Kenza Maher Kenjiro Fujimoto |
| |
Affiliation: | a ECME, Faculté des Sciences et Techniques Marrakech, University Cadi Ayyad, BP549, Av. A. Khattabi, 40000 Marrakech, Morocco b EVAR-MIMAS, Faculté des Sciences et Techniques Marrakech, University Cadi Ayyad, BP549, Av. A. Khattabi, 40000 Marrakech, Morocco c Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, Yamazaki 2461, Noda, Chiba 278-8510, Japan |
| |
Abstract: | Layered LiNi0.2Mn0.2Co0.6O2 phase, belonging to a solid solution between LiNi1/2Mn1/2O2 and LiCoO2 most commercialized cathodes, was prepared via the combustion method at 900 °C for a short time (1 h). Structural, electrochemical and magnetic properties of this material were investigated. Rietveld analysis of the XRD pattern shows this compound as having the α-NaFeO2 type structure (S.G. R-3m; a = 2.8399(2) ?; c = 14.165(1) ?) with almost none of the well-known Li/Ni cation disorder. SQUID measurements clearly indicate that the studied compound consists of Ni2+, Co3+ and Mn4+ ions in the crystal structure. X-ray analysis of the chemically delithiated LixNi0.2Mn0.2Co0.6O2 phases reveals that the rhombohedral symmetry was maintained during Li-extraction, confirmed by the monotonous variation of the potential-composition curve of the Li//LixNi0.2Mn0.2Co0.6O2 cell. LiNi0.2Mn0.2Co0.6O2 cathode has a discharge capacity of ∼160 mAh g−1 in the voltage range 2.7-4.3 V corresponding to the extraction/insertion of 0.6 lithium ion with very low polarization. It exhibits a stable capacity on cycling and good rate capability in the rate range 0.2-2 C. The almost 2D structure of this cathode material, its good electrochemical performances and its relatively low cost comparing to LiCoO2, make this material very promising for applications. |
| |
Keywords: | Cathode material Lithium batteries Rate capability Magnetic properties |
本文献已被 ScienceDirect 等数据库收录! |
|