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Preparation method of lithium ionic cell positive pole material ferric phosphate lithium

A lithium-ion battery, lithium iron phosphate technology, applied in the direction of electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of poor shape, poor electrical performance, etc., to avoid complex processes, lively properties, good conductivity Effect

Inactive Publication Date: 2009-05-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method of lithium iron phosphate, the positive electrode material of lithium ion battery, which overcomes the shortcomings of the obtained lithium iron phosphate material, such as poor product form and poor electrical performance, and the production batch also greatly improved

Method used

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  • Preparation method of lithium ionic cell positive pole material ferric phosphate lithium

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Embodiment 1

[0017] Use iron oxalate and lithium dihydrogen phosphate according to Fe:Li:PO 4 After the mol ratio of =0.8:1:1 is mixed directly, add the acetone of 2 times of the total weight of the above-mentioned substances, carry out ball milling in ball mill for 2 hours, after the slurry after ball milling is through drying, crushing, granulation, the surface pressure is 0.01Kg / cm 2 After compaction under certain conditions, it is calcined at 500°C for 30 hours to make lithium iron phosphate material products.

Embodiment 2

[0019] Use iron acetate and lithium dihydrogen phosphate according to Fe:Li:PO 4 After the molar ratio of =1.2:1:1 is directly mixed, add acetone with 5 times of the total weight of the above-mentioned substances, and carry out ball milling in a ball mill for 20 hours. After the ball milling, the slurry is dried, crushed and granulated, and the surface pressure is 5Kg / cm 2 After compaction under certain conditions, it is calcined at 800°C for 2 hours to make a lithium iron phosphate material product.

Embodiment 3

[0021] Use iron stearate and lithium dihydrogen phosphate according to Fe:Li:PO 4 After the molar ratio of =1:1:1 is directly mixed, add acetone that is 3 times the weight of the total weight of the above-mentioned substances, and carry out ball milling in a ball mill for 5 hours. After the ball milling, the slurry is dried, pulverized, and granulated. / cm 2 After compaction under certain conditions, it is calcined at 750°C for 12 hours to make a lithium iron phosphate material product.

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Abstract

The invention is a preparation method for lithium iron phosphate which is the anode material for lithium ion battery. The invention relates to a manufacturing method for electrode material, whose steps are composed of: directly mixing the organic trivalence malysite and lithium dihydrogen phosphate according to the mol ratio of Fe:Li:PO4 equals to 0.8 to 1.2:1:1, adding acetone in weight of two to five times of the said substance and milling it for two to twenty hours in globe mill; drying, smashing and pelleting the sizing agent after milling; compacting with surface pressing of 0.01 to 5Kg / cm3 and calcining for two to thirty hours under the temperature of 500 to 800 degrees centigrade. The lithium iron phosphate material product Thus is produced. The invention can get the finished product after one-time agglomeration, which is characterized in producing little gas during the agglomeration, having simple producing equipment, being able to stably and reliably produce lithium iron phosphate material in large scale and producing upstanding products in appearance with good conductivity and steady electrochemical character.

Description

technical field [0001] The technical solution of the invention relates to a method for manufacturing an electrode material, in particular to a method for preparing lithium iron phosphate, a cathode material for a lithium ion battery. Background technique [0002] Lithium iron phosphate (LiFePO) with olivine structure 4 ) material, which was first discovered by American Padhi (A K Padhi et al., JElectrochem Soc, 1997, 144(4).) and his colleagues in 1997, is very suitable as a positive electrode material for lithium-ion batteries. Numerous research results show that: LiFePO 4 In the process of charging and discharging, the volume of the material only changes by about 6%, and the anionic group PO 4 3- Very stable, resulting in an unusually high cycle life (about 2000 cycles) and extremely stable safety performance of the material. The material does not use heavy metals such as nickel and cobalt, is low in cost, and is environmentally friendly. It is expected to become the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45
CPCY02E60/12Y02E60/10
Inventor 梁广川王丽梁金生李宝峰郅晓科
Owner HEBEI UNIV OF TECH
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