Electrochemical Characterization of Superfine Spinel LiMn_2O_4 Synthesized By Microwave-Polymer Network Method

Superfine spinel LiMn2O4 powders were synthesized with a gelation precursor by microwave--polymer network process. The gelation precursor was obtained by mixing Li2CO3, Mn(NO3) and polyacrylamide. Electrochemical tests show that the initial specific capacity is 120mAh/g, and the degradation rate of specific capacity is only 4.7% after 50 cycles. SEM and XRD results prove that the microwave-polymer network process can increase the purity of the phase, reduce the particle size of spinel LiMn2O4, and provide more active sites for Li+ intercalation. The microwave-polymer network process is a new method not only for synthesizing cathode material of Li ion cells,but also for synthesizing other advanced oxide ceramic materials.