The invention discloses a preparation method of a
lithium iron phosphate cathode material. The preparation method comprises the following steps of firstly, accurately weighing four raw materials in percentage by weight: 8 to 10% of
lithium carbonate, 50 to 54% of
ferrous oxalate, 28 to 30% of
ammonium dihydrogen
phosphate, and 6 to 8% of glucose, uniformly mixing, pressing into a
powder cake,
coating by pure carbon
powder, placing into a high temperature furnace,
sintering according to certain
temperature gradient, and blowing out the furnace and cooling; after the carbon
powder is recycled,
processing into the used
granularity, so as to obtain a finished product of the
lithium iron phosphate cathode material with density of 2.4+ / -1g / cm<3>, specific surface area of 15.5+ / -2.5m<2> / g, and capacity more than or equal to 160 to 170MAh / g. The preparation method has the advantages that the obtaining of raw materials is easy, the formula is reasonable, the production process is simple, the production cost is low, and the rate of finished product is high; by detecting the
lithium iron phosphate finished product material through the battery manufacturer and Dalian Institute of
Chemical Physics of Chinese Academy of Sciences, the
gram capacity is more than or equal to 155, the discharging rate is 98%, the
diffraction peak of
crystal form LiFePO4 is consistent with the literature
comparison standard, and the performance of the current
lithium iron phosphate cathode material is completely reached.