An exploration of new cathode materials along the two lines having the nominal compositions of (1 - x - y)LiNi1/2Mn1/2O 2 · x Li[Li1/3Mn2/3]O2 · yLiCoO2 (0 ≤ x = y ≤ 0.3 and x + y = 0.5) was performed in the phase diagram of LiNi1/2Mn1/2O 2-Li[Li1/3Mn2/3]O2-LiCoO 2 by a simple solid-state reaction. XRD results identified that all materials are pure phases with layered structure, indicating good structural compatibility between three layered compounds, LiNi1/2Mn 1/2O2, Li[Li1/3Mn2/3]O2, and LiCoO2. Li[Li1/3Mn2/3]O2 and LiCoO2 contents in these electrode materials presented important effects on structure and electrochemical properties. Our results demonstrated that the suitable structural integration of Li[Li1/3Mn 2/3]O2 and LiCoO2 components into LiNi 1/2Mn1/2O2 structure is a practicable way to prepare new electrode materials with the desired electrochemical performances even via a simple solid-state reaction. Among the materials investigated in this work, a reversible capacity of 180-200 mAh/g was obtained for the materials with 0.3 ≤ x + y ≤ 0.6 and excellent cycling performance was observed with a large x (x ≥ 0.25) value in the series of x + y = 0.5.
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