Method for preparing cathode material of lithium iron phosphate

A technology for lithium iron phosphate and positive electrode materials, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve problems such as poor morphology and poor electrical performance, and achieve low process cost, small particle size distribution, and conductive The effect of superior performance

Inactive Publication Date: 2009-09-02
丁建民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the disadvantages of poor morphology and poor electrical properties of the prepared lithium iron phosphate material, and the powder has excellent processing performance when making batteries

Method used

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  • Method for preparing cathode material of lithium iron phosphate
  • Method for preparing cathode material of lithium iron phosphate
  • Method for preparing cathode material of lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] a. Weighing: Weigh 40000g of lithium dihydrogen phosphate, 1571g of magnesium hydroxide, an ionic compound with good conductivity, 28580g of iron oxide, 1578g of ultrafine carbon powder with a specific surface area between 500-900m2 / g and a specific surface area of ​​40-100m2 3682g of superfine carbon powder between / g.

[0036] b. Ball milling: Add 500-800kg of 5-10mm zirconia ball milling media into the ball mill, and add 70-100 liters of deionized water, add lithium dihydrogen phosphate and magnesium hydroxide into the ball mill cylinder and stir the ball mill at high speed for 50-70 Minutes, then add iron oxide into the ball mill and stir the ball mill at high speed for 50-70 minutes, then add about 100 liters of deionized water, 3000-4000 ml of absolute ethanol dispersant and two different carbon powders and stir the ball mill at high speed for 30-50 minutes , so as to obtain a homogeneous slurry.

[0037] c, spray drying; by controlling the negative pressure (-60...

Embodiment 2

[0046] Embodiment 2: Take by weighing 40000g of lithium dihydrogen phosphate, 2245g of magnesium hydroxide, an ionic compound with good conductivity, 27660g of iron oxide, 1578g of superfine carbon powder with a specific surface area between 500~900m2 / g and a specific surface area of ​​40~100m2 3682g of superfine carbon powder between / g. Its specific manufacturing process is consistent with embodiment 1.

Embodiment 3

[0047] Embodiment 3: take by weighing 40000g of lithium dihydrogen phosphate, 449g of magnesium hydroxide, an ionic compound with good conductivity, 30120g of iron oxide, 1578g of superfine carbon powder with a specific surface area between 500~900m2 / g and a specific surface area of ​​40~100m2 3682g of superfine carbon powder between / g. Its specific manufacturing process is consistent with embodiment 1.

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Abstract

The invention discloses a method for preparing a cathode material of lithium iron phosphate for a lithium ion battery. The method comprises the following steps: firstly, adding a certain amount of deionized water into a ball mill, and adding lithium dihydrogen phosphate and ionic compound with good conductivity into the ball mill for stirring and ball milling at a high speed; secondly, adding iron oxide for stirring and ball milling at a high speed, and adding a certain amount of anhydrous ethanol as a dispersing agent; and finally, adding superfine conductive carbon black for full mixing and stirring to obtain evenly mixed powder by spray drying at a high speed, adding the powder into a mixing roll for mixing and granule crushing, and pressing the mixed powder into a block to improve the density of materials once again. After being preserved and sintered for 2 to 6 hours at 600 to 800 DEG C in a non-oxidizing sintering furnace and cooled below 50 DEG C, the materials after tablet pressing and granulation are discharged, crushed, refined and sifted, and the powder is dried so as to obtain lithium iron phosphate powder with no impurities, single structure and small granule size distribution. In addition, the preparation process method through improvement significantly reduces the cost for preparing the lithium iron phosphate and has little pollution.

Description

technical field [0001] The invention relates to a preparation method of positive electrode material lithium iron phosphate. Background technique [0002] Exhaust emissions from automobiles have become an important source of pollution in today's society. With the increase of car ownership, the problem of car pollution is becoming more and more serious. According to the statistics of OICA, car exhaust emissions have accounted for 15.9% of the total global CO2 emissions. If the quality of car exhaust emissions cannot be effectively improved, this figure may continue to increase . In addition, with the development of the world economy, international oil prices have fluctuated violently in recent years, coupled with the expected reduction in future oil resources, oil has become a bottleneck for the development of the world economy. Due to the long-term needs of protecting the environment and reducing the consumption of petroleum resources, new energy vehicles have become a new ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 丁建民
Owner 丁建民
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