The quaternary spinel compounds LiM~yMn~2~-~yO~4(M=Ni,Cr,Mo,V) were prepared as thecathode material of 4V lithium secondary batteries. X- ray diffraction and electrochemical stueieswere carried out using the Li/Li~xM~0~.~1Mn~1~.~9O~4 cells. The results show that these cathodes were more tolerant to repeated lithium extraction and insertion at the expense of some initial capacity.The improvement in cycling performance is attributed to the stabilization in the spinel structure by the metal cations. The performance of LiM~0~.~1Mn~1~. ~9O~4 in 5V range is also discussed.

Key words: SPINEL, NICKEL, CHROMIUM, MOLYBDENUM, VANADIUM, LITHIUM BATTERIES, DOPE, X-RAY DIFFRACTION ANALYSIS, CHEMICAL MODIFIED ELECTRODE