The invention relates to a method for preparing a
cathode material Li4Ti5O12 of a high-performance
lithium ion battery. The method comprises the following steps of: adopting the
combined method of
sol-gel and
microwave treatment to prepare micro
powder of nano-class Li4Ti5O12, and simultaneously modifying Li4Ti5O12 by
carbon doping and metallic
doping. The method utilizes the
sol-
gel method to effectively control
chemical composition,
phase composition and
powder size of the Li4Ti5O12, thereby improving the uniformity and the electric
conductivity of the Li4Ti5O12; simultaneously by utilizing the characteristics of the
microwave technique of quick temperature rise, even heating and conglobation resistance, the high-power industrial
microwave oven is used for treatment, so that the
treatment time of the Li4Ti5O12 is greatly shortened, the yield is greatly improved, and the cost and the
energy consumption of the material are reduced, the process is simplified, the efficiency on the industrialized production of the
lithium ion battery is improved, and the industrialized application is easily achieved; and by
doping carbon and metallic elements, the electric
conductivity of
lithium iron phosphate is greatly improved, and the charging and discharging capacities and the cycle index of the
lithium iron phosphate are simultaneously and effectively increased.