Method and device for preparing lithium iron phosphate precursor by high-temperature superheated steam dry method

Abstract

The invention discloses a method and a device for preparing a lithium iron phosphate precursor by a high-temperature superheated steam dry method. A steam kinetic energy milling machine is arranged, high-temperature superheated steam is taken as a smashing power source, the lithium iron phosphate precursor mixture is first atomized and then is subjected to ultrafine grinding, and the method belongs to a dry smashing method to prepare ultrafine powder. Since the gas source of the whole system is high-temperature superheated steam, a water-containing material is rapidly dried during the smashing process, the drying process is reduced, the energy consumption is reduced, and the production cost is reduced. Compared with the prior art, the method has the advantages that the cost can be saved by 1190 yuan / ton.

Description

technical field [0001] The invention relates to the technical field of lithium iron phosphate preparation, in particular to a method and a device for preparing a lithium iron phosphate precursor by using a high-temperature superheated steam dry method. Background technique [0002] Lithium iron phosphate is a new type of electrode material for lithium-ion batteries. Lithium iron phosphate has become the first choice for lithium-ion power batteries due to its good safety performance, long cycle life, high energy density, and no environmental pollution, with great development potential. When lithium iron phosphate is used as an electrode material, in order to improve the electrochemical performance of lithium iron phosphate, it is necessary to perform ultra-fine processing on the lithium iron phosphate precursor mixture. [0003] The current common practice is to prepare the lithium iron phosphate precursor by wet grinding the lithium iron phosphate precursor material and then...

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Problems solved by technology

[0004] The biggest problem in the above-mentioned existing process is: wet grinding, which has long grinding time, high energy consumption, large equipment wear, and is prone to mechanical failure; spray drying can directly dry the lithium iron phosphate precursor solution after wet grinding Granular products, but the investment cost of the equipment is high, the processing capacity is small, and the thermal efficiency is relatively low, generally only 40% to 60% (Huang Lixin, Zhou Ruijun, A.S.Mujumdar. Research progress and prospects of spray drying technology in recent years. Drying technology and equipment ,2008,01:3-8.)

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