Preparation method of lithium iron phosphate/C composite material with high specific surface area

The invention relates to a preparation method of a lithium iron phosphate/C composite material with high specific surface area, which comprises the following steps: 1)taking battery grade nano ferric phosphate and battery grade lithium carbonate for mixing according to mol ratio of Fe: Li being at 0.99:1, grinding and adding butanone, regrinding, uniformly dispersing, adding 3% of polyvinyl alcohol aqueous solution, stirring to obtain uniform slurry, then slowly adding active carbon with high specific surface area, stirring to obtain the uniform slurry; 2)drying the slurry at 1-5 DEG C for 3-5 hours through air blast to become block solid; 3)under nitrogen protection, heating the block solid to 600 DEG C with speed of 2 DEG C/minute and sintering, keeping for 2 hours, heating to 720 DEG C with speed of 2 DEG C/minute and sintering, keeping for 4 hours, then stopping heating, naturally cooling to room temperature; and 4)grinding the sintered products, passing through a sieve with 325 meshes to obtain the lithium iron phosphate/C composite material with high specific surface area.