NOVELTY - The method involves preparing sol-gel solution and pouring the sol-gel solution in a water bath at 60 degrees Celsius to obtain a dry gel. The dry gel is dried at 120 degrees Celsius to obtain a dried solid. The dried solid is grinded to obtain precursor powder. The precursor powder is roasted in a tubular furnace at a temperature range of 250 degrees Celsius to 500 degree Celsius under inert atmosphere for 2-6 hrs, and subjected to calcining operation. The powder is naturally cooled at room temperature to obtain carbon coated lithium manganese phosphate of particle size in range of 50-150 nm.    USE - Method for manufacturing a lithium ion battery.    ADVANTAGE - The method enables uniform dispersal of the carbon coated lithium manganese phosphate, thus effectively preventing agglomeration of particles in a lithium ion battery, and improving electronic conductivity of the battery. The method enables manufacturing the battery with a discharging platform of about 4V and achieving high discharge capacity and better cycle stability of electrodes of the battery.    DETAILED DESCRIPTION - The sol-gel solution is prepared by dispersing a lithium source compound, a manganese source compound, a phosphorus source compound and a complexing agent in a solvent to form solution, and adjusting PH value of the solution by utilizing concentrated nitric acid or ammonia. The complexing agent is selected from malic acid, lactic acid, citric acid, oxalic acid, ascorbic, benzoic acid, malonic, acetic acid, salicylic, tartaric acid, or a mixture of the above acids. The solvent is selected from water, ethanol, acetone, water-alcohol solution, ethylene glycol or polyethylene glycol. The inert atmosphere contains inert gas that is nitrogen or a mixture of nitrogen and hydrogen, argon and hydrogen or nitrogen and argon.    DESCRIPTION OF DRAWING(S) - The drawing shows a graphical illustration of a lithium ion battery manufacturing method.'(Drawing includes non-English language text)'