Preparation method of lithium iron phosphate cathode material

Abstract

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.

Description

technical field [0001] The invention relates to a lithium iron phosphate positive electrode material, in particular to a preparation method of a lithium iron phosphate positive electrode material. Background technique [0002] Lithium iron phosphate material has the characteristics of good safety, excellent cycle performance, environmental friendliness, and wide source of raw materials. It is recognized as the preferred cathode material for the new generation of lithium-ion batteries, and has become the key research and development direction of major developed countries in the world today. Due to the complex preparation process and high environmental requirements of this material, it is difficult to realize it in China. At present, only a few companies in some developed countries have achieved mass production. Due to the high threshold of manufacturing technology, the yield rate is very low (generally as low as 60%), the performance is unstable but the cost is high, and the ...

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Problems solved by technology

Due to the complex preparation process and high environmental requirements of this material, it is difficult to realize it in China. At present, only a few companies in some developed countries have achieved mass production.

Due to the high threshold of manufacturing technology, the yield rate is very low (generally as low as 60%), the performance is unstable but the cost is high, and the market acceptance is not high, which directly affects the domestic industrialization of this material

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