Abstract
This study reports on the characterization of layered Li (Ni1/3Co1/3Mn1/3)O2 (x = 1.05 and 1.1) cathodes synthesized by a simple ambient temperature redox synthesis and post-heat treatment with added lithium sources.Synchrotron XANES and ICP measurements were performed to confirm the change in oxidation state during the redox reaction and the successful control of the stoichiometric ratio of ternary transition metal oxides (Ni2+ 0.33Co3+ 0.35Mn4+ 0.32Oy).In the FE-SEM image, loosely aggregated particles with an average diameter of 60nm appeared in the intermediate product, and the particle size grew to several hundred nanometers after lithiation at elevated temperature.The electrochemical performances at 14 mAg-1 in the potential range of 3.0–4.3V vs. Li/Li+ indicated that reasonable specific capacities and cycle performances are registered for all the prepared cathodes. especially, the Li1.05(Ni1/3Co1/3Mn1/3)O2 composition demonstrated the highest capacity retention value (~99%) after 50 cycles and better rate performances (104, 91, 76, and 67 mAhg-1) at high current densities (229, 457, 914, and 1429 mAg-1 respectively).
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