The effect of doping on the electrochemical performance was studied for spinel type LiLo2MxMn2-QyO- used as cathode material in lithium-ion battery. TG/DTA curves of the precursor (the raw materials) doped with different elements were studied. The spinel materials Lil. 02Mn204, Li1. 02Coo. 02Cro. olLao. olMnL96Fo. 0203. 98, Li0. o2Coeo2Cro. ol L, %. oiMnl. 96Clo. oO3., Lilo2Coo1. 02LaLo2Mnl. 97Clo. 0203. 98, Lil. 02Coeo2CreolMnL9704, were prepared by solid-state reaction method after the pretreatment of conversion under low temperature and uniform mixing. X-ray diffraction patterns showed that all the samples had perfect spinel structure. SEM indicated that the particles of the samples had uniform size and were distributed evenly. The results of the charge/discharge curves showed that Lil. ozCoo. ozCro. olLao. olMn196Fo. ozO3 had better performance than other materials according to the inhibition of decline of reversible capacity of spinel LiLozMMnz-Q3-O4,.. Therefore, cycle performance had been improved so obviously that 93.9% of the initial capacity were preserved after 100 cycles. Furthermore, electrochemical impedance tests were carried out with the spinel Lil. o2Coo. ozCro. olLao. Mn196Fo. o203. 98 as working electrode, Lithium as counter elec- trode and reference electrode. Results showed that this material possessed good charge/discharge reversible capa- bility and had the lowest impedance in 3. 95-4. 25 V range (on the stage of charge/discharge).