Characteristics of ZnMn₂O₄ Nanopowders Prepared by Flame Spray Pyrolysis for Use as Anode Material in Lithium Ion Batteries

摘要

ZnMn2O4 nanopowders with homogeneous composition are prepared by flame spray pyrolysis from anaqueous spray solution containing Zn and Mn components. The ZnMn2O4 powders subjected to post- treatment at 500C exhibit a mean size of 65 nm and nonaggregation characteristics. The dischargecapacities of the precursor powder and the ZnMn2O4 powders post-treated at 400, 500, and 600C are-1 -1 1156, 1230, 1192, and 1086 mAh g , respectively, after 40 cycles at a current density of 300 mA g ,and the corresponding capacity retentions measured after the first cycle are 69, 75, 78, and 79%. TheZnMn2O4 nanopowders post-treated at 500C exhibit high initial discharge and charge capacities of-1 -1 1192 and 632 mAh g , respectively, at a current density of 1000 mA g . The discharge capacity of the-1 powders decreases from 1192 to 470 mAh g during the first 15 cycles, and then becomes stable at-1 values above 450 mAh g until 110 cycles. Subsequently, the discharge capacities of the ZnMn2O4th nanopowders increase gradually from the 110 cycle onward. The maximum discharge capacity-1 reaches 670 mAh g after 160 cycles.