STUDIES ON THE LI-MN-O SPINEL SYSTEM (OBTAINED FROM MELT-IMPREGNATIONMETHOD) AS POSITIVE ELECTRODES FOR 4 V LITHIUM BATTERIES .3. CHARACTERIZATION OF CAPACITY AND RECHARGEABILITY

A series of 'lithium-rich' or 'oxygen-rich' spinel compounds are prepa red from the reaction of LiNO3 with electrochemically prepared mangane se dioxide (EMD) via the melt-impregnation method. The capacity and re chargeability of these compounds are semi-quantitatively discussed in terms of an LiMn2O4-Li4Mn5O12-Li2Mn4O9 phase diagram. The capacity dec reases as the Lithium or oxygen content increases in the spinel matrix . By contrast, the rechargeability is improved.