Preparation and Electrochemical Characterization of Micron‐Sized Spinel LiMn2 O 4

Publisher Website
Google Scholar
Abstract
The preparation and characterization of spinel having small average particle sizes (<4.0 μm) and narrow particle size distribution are reported. They were obtained by heating a 1:4 mixture at 650 to 850°C in oxygen. Particle size control of the product was achieved by controlling the particle sizes of the precursor materials and the heating conditions. Heating the mixture results in the formation of initially, which then reacts with to form spinel according to: . The cathodes have shown excellent rechargeability as well as superior rate capability in Li/polymer electrolyte/ cells cycled between 3.0 and 4.3 V. Specific capacities between 0.75 and 0.83 Li per were obtained for more than fifty cycles. The cathodes can be reversibly cycled between 2.4 and 3.5 V but with declining capacity. For the prepared at 650°C, cycling in the 3 V region has little effect on its subsequent performance in the 4 V region, while for the prepared at higher temperatures, such cycling causes the 4 V capacity to decline.

This publication has 0 references indexed in Scilit: