TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The doping composite with metal element includes aluminum nitrate nanohydrate, magnesium nitrate hexahydrate and chromium nitrate. The buffering agent includes sodium carbonate, potassium carbonate and ammonia water. The fluorosilicate impurity removing agent includes sodium fluorosilicate and potassium fluorosilicate. Preferred Process: The method further comprises preparing not less than 99.5% manganese source compound based on industrial stage content into 0.15-0.2 mol/L manganese source compound water solution; preparing not less than 99% doping compound into 0.1-0.15 mol/L doping compound water solution; preparing not less than 99.5% buffering agent into 0.13 mol/L buffering agent water solution, and adding 0.15-0.2 mol/L manganese source compound water solution to coprecipitation kettle at 9-15 L/hour; adding 0.1-0.15 mol/L doping compound water solution at coprecipitation kettle at speed of 2-3 L/hour, agitating, adding 2% impurity removing agent based on generated precursor mass, heating at 50-70 degrees C, and adding 0.3 mol/L buffering agent water solution; adjusting pH at 9-10, agitating for 2-3 hours, adding material to obtain precipitate of spherical modification manganic acid lithium precursor, washing precipitate at 2-3 times via acid water with pH 3-5, with washing water of 10 times more than volume of precipitate, washing at 2-6 times by deionized water, filtering and drying to obtain spherical modification manganic acid lithium precursor; adding precursor and manganic acid lithium source composite to dry mixing machine, controlling ratio of Li to Mn to 0.5:0.55, mixing for 60 minutes at 200 revolutions/minute, and standing; sintering mixture of precursor and battery stage manganic acid lithium composite in plate kiln for 12-16 hours at 700-900 degrees C, naturally cooling, and sieving to obtain spherical manganic acid lithium; transforming mixture and 99.8% aluminum hydroxide with ratio of aluminum to manganese of 1:18 mol to ball mill machine, taking absolute ethyl alcohol as ball milling medium to material of 1:2, ball milling and wrapping for 60 minutes at 30-50 degrees C, and drying in drying machine to obtain sintering matter of spinel type manganic acid lithium electrode material wrapped with aluminum; and sintering spinel type manganic acid lithium electrode material wrapped with aluminum to pushing plate kiln for 8-12 hours at 450-650 degrees C, naturally cooling, uniformly mixing, and sieving to obtain spinel type manganic acid lithium electrode material.