Effects of ratios of Li2MnO3 and Li(Ni1/3Mn1/3Co1/3)O2 phases on the properties of composite cathode powders in spray pyrolysis

• The xLi2MnO3–(1 − x)Li(Ni1/3Mn1/3Co1/3)O2 (0 ≤ x ≤ 1) composite cathode powders are prepared by spray pyrolysis.
• The initial discharge capacities of the composite cathode powders are 242, 283, 291, and 234 mAh g−1 when x = 0.2, 0.4, 0.5, and 0.8, respectively.
• The cathode powders with appropriate proportions of Li2MnO3 and Li(Ni1/3Mn1/3Co1/3)O2 have good cycling properties.

Composite cathode powders of xLi2MnO3–(1 − x)Li(Ni1/3Mn1/3Co1/3)O2 (0 ≤ x ≤ 1) are prepared by spray pyrolysis. The BET surface areas of the composite powders post-treated at 800 °C are 5, 12, 16, 12, 10, and 4 m2 g−1 for x = 0, 0.2, 0.4, 0.5, 0.8, and 1, respectively. The initial discharge capacities of the pure Li(Ni1/3Co1/3Mn1/3)O2 and Li2MnO3 powders at a constant current density of 25 mA g−1 between 2.0 and 4.8 V are 219 and 27 mAh g−1, respectively. The initial discharge capacities of the composite cathode powders are 242, 283, 291, and 234 mAh g−1 for x = 0.2, 0.4, 0.5, and 0.8, respectively. The discharge capacity of the 0.5Li2MnO3–0.5Li(Ni1/3Mn1/3Co1/3)O2 cathode powder decreases from 291 to 266 mAh g−1 by the 50th cycle, giving a capacity retention of 92%.

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