Process for producing lithium ion battery anode material ferrtilithium phosphate

Abstract

A method for preparing lithium iron orthophosphate being used as material of lithium cell positive electrode includes mixing iron orthophosphate with lithium phosphate and cane sugar according to designed ratio , grinding mixture by dry method in grinder for 12 ¿C 36 hours , putting ground power into heat ¿C treatment oven for carbonization , forming plate by pressing , placing plate in container and placing container into microwave oven for synthesizing reaction , grinding reacted matter to be powder being able to pass through 400 micron screen for being used as final product .

Description

Technical field: [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of lithium ferrous phosphate, an olivine structure compound. Background technique: [0002] As a high specific energy chemical power source, lithium-ion batteries have been widely used in mobile communications, portable computers, video cameras, cameras, portable instruments and meters, etc. , pure electric and hybrid electric vehicle power supply, the preferred supporting power supply for space power supply. Most of the current lithium-ion batteries use expensive lithium cobalt oxide as the positive electrode material. Compared with the traditional lithium cobalt oxide positive electrode material, lithium iron phosphate has the following advantages: [0003] (1) Higher security. Lithium iron phosphate is safer than lithium cobalt oxide and other materials widely used at present. The safety performance of lit...

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Problems solved by technology

[0011] The product prepared by this method has the following disadvantages: because the starting materials cannot be mixed and fully contacted microscopically, the product phase is uneven, the crystal is irregular in shape, the crystal size is large, and the particle size distribution range is wide, resulting in its high-rate discharge performance. Poor; In addition, due to the long calcination time, the temperature is not easy to control, and the reduction of ferric iron is not sufficient, resulting in low specific capacity of the product, and the reversible capacity is only below 100mA / g

However, the drying shrinkage is large, the industrial production is difficult, and the synthesis cycle is long