▎ 摘　　要

NOVELTY - Preparing lithium iron phosphate/graphene/platinum composite electrode material involves mixing 3-4 g of oxidized graphene, 10-15 ml of 98% sulfuric acid solution and 30-45 ml of 60% nitric acid solution in 250 ml three-necked flask. The flask is placed in water bath and the solution is stirred for 5-6 hours. The solution is centrifuged to obtain treated graphene oxide. The treated graphene oxide is added to the solution of 1-3 mu mole/L in solid to liquid ratio of 1:100. The solution is dispersed for 10-15 minute and then irradiated with ultraviolet lamp for 20-25 minutes. USE - Method for preparing lithium iron phosphate/graphene oxide/platinum composite electrode material (claimed). ADVANTAGE - The method enables to prepare lithium iron phosphate/graphene oxide/platinum composite electrode material in simple and cost effective manner under nmild reaction conditions. The product has high purity, improved battery rate capability and good high voltage performance. DETAILED DESCRIPTION - Preparing lithium iron phosphate/graphene/platinum composite electrode material involves mixing 3-4 g of oxidized graphene, 10-15 ml of 98% sulfuric acid solution and 30-45 ml of 60% nitric acid solution in 250 ml three-necked flask. The flask is placed in water bath and the solution is stirred for 5-6 hours. The solution is centrifuged to obtain treated graphene oxide. The treated graphene oxide is added to the solution of 1-3 mu mole/L in solid to liquid ratio of 1:100. The solution is dispersed for 10-15 minute and then irradiated with ultraviolet lamp for 20-25 minutes. After filtration, the solution is filtered and the residue is added to the deionized water in solid-liquid ratio of 1:50. The resultant is ultrasonicated for 10-15 minutes. The dispersion liquid is irradiated for 60-70 minutes under ultraviolet lamp, then filtered to obtain residue which is dried in oven at 60-70 degrees C for 8-10 hours to obtain platinum oxide particles loaded with graphene oxide. 100-120 ml of polyethylene glycol is measured in a 500 ml beaker and mixed with 30-35 ml of 15% phosphoric acid solution with stirring for 20-30 minutes followed by the addition of 75-80 ml of 10% lithium hydroxide solution dropping at rate of 5-7 ml/minute, lithium phosphate suspension and 50-55 ml of 10% ferrous sulfate solution into lithium phosphate suspension with stirring to obtain green suspension which is taken in 500 ml polytetrafluoroethylene reaction kettle and heated to 150-200 degrees C under the protection of argon for 5-7 hours. After the reaction, the reactants are cooled down to room temperature and then centrifuged. The obtained precipitate is washed with deionized water and anhydrous ethanol 3-5 times and then dried in vacuum oven at 60-70 degrees C for 8-10 hours to obtain lithium iron phosphate particles. The lithium iron phosphate particles are mixed with distilled water in solid-liquid ratio of 1:50 and uniformly dispersed by stirring. The platinum oxide particles loaded with graphene oxide are dried in oven at 100-110 degrees C for 30-40 minutes. The dried pellets were placed in a tube furnace and heated to 400-600 degrees C under argon atmosphere for 3-4 hours to obtain lithium iron phosphate/graphene oxide/platinum composite electrode material.