Abstract
The structure and electrochemical properties of Li[Ni1/2-x/2Mn1/2-x/2Lix]O2 (0 less than x less than 1/5) with a layered rock-salt type structure have been investigated. The samples were prepared by the co-precipitation of Ni-Mn double hydroxides and the subsequent solid state reaction with LiOH. The electron diffraction indicates a [root 3 x root 3] R30 °type ordering in the transition metal layers and the order parameters increase with increasing x. Rietveld refinements of X-ray diffraction patterns for Li[Ni1/2-x/2Mn1/2-x/2Lix]O2 indicate some cationic disorders of Li+ and Ni2+ between 3a and 3b-sites. The fraction of extra- Ni2+ in the Li layers is reduced with increasing the Li composition. The electrochemical properties were discussed based on the crystal structure and the morphology.
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