Electrochemical and Physical Properties of Layered-Spinel Composite Cathode Powders Prepared by Spray Pyrolysis

摘要

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