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Preparation method of lithium iron phosphate of positive electrode material of lithium ion battery

A technology for lithium ferrous phosphate and lithium-ion batteries, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of non-concentrated particle size distribution, low tap density, and low physical purity of ferrous phosphate, and achieve a Ph value Gentle changes, avoiding uneven effects

Inactive Publication Date: 2010-07-14
IRICO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] While the prospect is bright, the ferrous phosphate synthesized by the traditional method has the problems of low purity, non-concentrated particle size distribution, low tap density and poor crystallization, which restrict the large-scale application of lithium ferrous phosphate

Method used

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  • Preparation method of lithium iron phosphate of positive electrode material of lithium ion battery
  • Preparation method of lithium iron phosphate of positive electrode material of lithium ion battery

Examples

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Embodiment 1

[0021] FeSO 4 ·7H 2 O, LiOH·H 2 O, H 3 PO 4 As the raw material, where Li:Fe:P=3:1:1. The above reagents were dissolved in deionized water to obtain a transparent homogeneous solution, and the FeSO 4 ·7H 2 O solution and H 3 PO 4 After the solution was fully mixed, the LiOH·H 2 O solution was added to it, mixed well to obtain a homogeneous solution, and the amount of substance added to the solution was Fe 2+ The ascorbic acid solution whose amount is 4 times that of the substance and the urea solution whose amount is 15 times that of all metal ion substances are fully mixed. Move the obtained solution into a flask and heat it in a water bath to control the temperature at 80° C., and keep stirring with a magnetic stirrer. When the pH of the solution is 6, the product is suction-filtered and washed with deionized water 5 times its volume. After that, Place in a vacuum drying oven at a constant temperature of 40°C to dry. The resulting dry product was placed in an alum...

Embodiment 2

[0023] With FeCl, LiNO 3 、H 3 PO 4 As a raw material, wherein Li: Fe: P = 1.5: 1: 1, the above reagents were dissolved in deionized water to obtain a transparent homogeneous solution, FeCl solution and H 3 PO 4 After the solution was thoroughly mixed, the LiNO 3 The solution is added to it, mixed well to obtain a homogeneous solution, and the amount of substance added to the solution is Fe 2+ The ascorbic acid solution whose amount is 3 times that of the substance and the urea solution whose amount is 25 times that of all metal ion substances are fully mixed. Move the obtained solution into a flask, heat it in a water bath to control the temperature at 60°C, and keep stirring with a magnetic stirrer. When the pH of the solution is 7.5, filter the product with suction and wash it with deionized water 6 times its volume for 4 times. , placed in a vacuum drying oven at a constant temperature of 35°C to dry. The resulting dry product was placed in an alumina crucible under N...

Embodiment 3

[0025] Fe(NH 4 ) 2 (SO 4 ) 2 、LiNO 3 、H 3 PO 4 As the raw material, where Li:Fe:P=2:1:1. The above reagents were dissolved in deionized water to obtain a transparent homogeneous solution, and Fe(NH 4 ) 2 (SO 4 ) 2 solution and H 3 PO 4 After the solution was thoroughly mixed, the LiNO 3 The solution is added to it, mixed well to obtain a homogeneous solution, and the amount of substance added to the solution is Fe 2+ The ascorbic acid solution whose amount is 3 times that of the substance and the urea solution whose amount is 20 times that of all metal ion substances are fully mixed. Move the obtained solution into a flask, heat it in a water bath, control the temperature at 90°C, and keep stirring with a magnetic stirrer. When the pH of the solution is 6.5, the product is suction-filtered and washed with deionized water 8 times its volume for 5 minutes. Place in a vacuum drying oven at a constant temperature of 30°C to dry. The resulting dry product was placed ...

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Abstract

The invention provides a preparation method of lithium iron phosphate of positive electrode materials of lithium ion batteries. The lithium iron phosphate has a chemical formula of LiFePO4. The preparation method of the lithium iron phosphate comprises the following steps: using dissoluble compounds containing Fe<2+> as iron sources, then, mixing the iron sources with H3PO4 and dissoluble compounds containing Li<+> according to the mass ratio of Li / Fe / P=1.5 to 3.5 / 1 / 1 to obtain a homogeneous solution; adding carbamide in the solution to be used as a pH value regulating agent; adding ascorbic acid as oxidation inhibitors; placing the obtained mixed solution into a water bath pot to be heated; stirring the obtained mixed solution by a magnetic stirring apparatus until the pH value is in a range between 6 and 8 to obtain active ingredient precipitates; washing the precipitates; drying the precipitates at a low temperature; taking out materials after the drying completion; and sintering the materials under in the protection atmosphere to obtain LiFePO4 materials. The lithium iron phosphate prepared by the method of the invention has concentrated grain fineness distribution and good degree of crystallinity.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a preparation method of lithium iron phosphate, a cathode material of a lithium ion battery. Background technique [0002] Since 1997 A.K.Padhi first reported lithium iron phosphate (LiFePO 4 ) has the function of deintercalating lithium, and because of its high energy density, low price, and excellent safety, it is an excellent cathode material for power lithium-ion batteries, and has attracted extensive attention in the energy field. [0003] At present, there are three leading companies in the field of lithium iron phosphate in the world, namely A123 in the United States, Phostech in Canada and Valence in the United States, who have mastered relatively mature mass production technologies. At present, the production capacity of the three major manufacturers is about 4,000 tons / year. In 1997, lithium iron phosphate material began to attract domestic attention. In 1998,...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/58
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 赵金鑫
Owner IRICO
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