Abstract
Abstract LiNi y Ti 1− y O 2 (0.7≤ y ≤0.95) solid solution has been prepared by a wet process. According to X-ray diffraction analysis, these materials are found to have a rhombohedral layered structure( R 3 m ) and are an isostructure LNiO 2 . The I (1 0 4)/ I (0 0 3) intensity ratio is increased with Ti concentration, which indicates the cation mixing between transition metal layer and lithium layer is occurred. The LiNi y Ti 1− y O 2 compounds have well-developed layered structures and a particle size of ∼1 μm. The titanium and nickel in the lattice is found to be trivalent and bivalent, respectively. The first discharge capacity of LiNi y Ti 1− y O 2 is 10–25 mAh g −1 . These values are inferior to those of LiNi y Ti 1− y O 2 prepared by a solid-state reaction (30 mAh g −1 ). The low discharge capacities are due to local structural change during the first charge, where transition metal ions in the lithium layer block the diffusion of Li ions.
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