Electrochemical and physical properties of layered-spinel composite cathode powders prepared by spray pyrolysis

The xLi2MnO3·(1-x)Li4Mn5O12 (x = 1, 0.5, 0.3, 0) composite cathode powders are prepared by spray pyrolysis. The composite powders before and after post-treatment at 600^°C have fine size and aggregated spherical morphologies of the nanometer-sized primary particles irrespective of the compositions of the cathode powders. The initial discharge capacity of the Li₂MnO₃ component is 258 mAh g^-1, in which the Coulombic efficiencyis 85%. The discharge capacity of the Li₂MnO₃ powders drops from 258 to 115 after 10 cycles. The initial discharge capacities of xLi₂MnO₃·(1-x)Li₄Mn₅O ₁₂ composite powders are 225 ,219 and 211 mAh g^-1 when the x values are 0.5 ,0.3 and 0. The capacity retentions of the composite powders are 88, 90, and 83 % after 30 cycles when the x values are 0.5, 0.3, and 0.