Abstract: The lanthanum doped modified spinel lithium manganate LiMn2－xLaxO4 (x=0,0.01, 0.02, 0.03, 0.04, 0.05, 0.10) used for cathode of lithium-ion batteries was prepared by solid-state method. The structure of the prepared cathode material was characterized by XRD. The effects of doping lanthanum on stabilizing the crystal structure were analyzed in terms of the material structure, charge and discharge testing results and cycle performance. The cycle performance of the modified material was obviously improved at both normal temperature and high temperature. Moreover, when the x in LiMn2－xLaxO4 was less than 0.04,high capacity can be observed. For instance, LiMn1.99La0.01O4 and LiMn1.98La0.02O4 have as high capacity as 122.4 mAh•g－1 and 116.7 mAh•g－1(see Fig.5(a)) respectively compared with the 120.8 mAh•g－1 of LiMn2O4. In addition, these two cathode materials can hold 95.60％ and 97.46％ of the initial capacity respectively after 50 cycles.

Key words: Cathode material, Spinel, Dope, Cycle performance