Journal
SOLID STATE IONICS
Volume 178, Issue 31-32, Pages 1668-1675Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2007.10.019
Keywords
layered oxides; magnetization; crystal structure; Li-ion batteries; electrochemical cycling
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Three kinds of LiNi0.65Co0.25Mn0.1O2 samples were prepared using a combustion method at different synthetic conditions (C1: 900 degrees C/1 h; C2: 900 degrees C/12 h and C3: 1000 degrees C/12 h). The samples were characterized using X-ray diffraction, scanning electron microscopy and magnetization measurements before their use as positive electrode material in lithium-ion batteries. Sample C1 presents the most ordered structure with less than 3% of nickel ions in the lithium plane. Increasing synthesis temperature and/or time lead to an increase of the Li/Ni disorder. The amount of extra-nickel ions in the lithium plane strongly affects the magnetic behaviour and the electrochemical performances of the prepared material. LiNi0.65Co0.25Mn0.1O2 prepared at 900 degrees C for 1 h presents the best cycling properties. (c) 2007 Elsevier B.V. All rights reserved.
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