RECHARGEABLE LITHIUM BATTERY WITH SPINEL-RELATED LAMBDA-MNO2 .3. SCALING-UP PROBLEMS ASSOCIATED WITH LIMN2O4 SYNTHESIS

The scaling-up problems connected with LiMn2O4 synthesis were studied. A strong effect of the mass of the starting materials and of the air flow rate through the furnace during the synthesis on the specific cap acity was observed. The increase of the batch amount brings about a re duction in the specific surface area of the product, which cannot be c ompensated by grinding because it leads to considerable reduction of i ts electrochemical utilization. The very fast or slow cooling of the s ynthesized material have a negative effect on the specific capacity. T he process of preparation of LiMn2O4 spinel with high electrochemical performance is a rather complex procedure, but it is possible to obtai n a product, which is capable to exchange reversibly up to 0.9 equiv. Li per mole.