Abstract: Li_1.02CraCobLacMn₂－a－b－cFyO₄－y (a,b,c＝0, 0.01, 0.02; y＝0, 0.02) doped with several ions (anion-cation) was prepared by solid-state reaction method. X-ray diffraction showed that all the samples had perfect spinel strucure. The results of the charge/discharge curves showed that multiple doping spinel Li_1.02Cr_0.01Co_0.02La_0.01Mn_1.96F_0.02O_3.98 had better performance than those undoped or cation-doped materials according to the inhibition of decline of reversible capacity of spinel at 25 ℃. Besides that, the multiple doping spinel also had ideal discharge capacity. And the cycle performance(120.1～113.5 mAh•g-1) was improved so obviously that 94.5% of the initial capacity was preserved after 80 cycles. Meanwhile, the elevated temperature(55 ℃) perforance of the material was improved. With the spinel Li_1.02CraCobLacMn₂－a－b－cFyO₄－y as working electrode, Li as counter electrode and reference electrode, electro-chemical impedance tests showed that this material possessed good charge/discharge reversible capability and had the lowest impedance on the stage of charge/discharge.

Key words: Lithium-ion batteries, Spinel, Anion-cation doping, Cathode material, Electrochemical performance