Method for preparing spherical carbon-coated lithium iron phosphate positive electrode material through atomization method

A carbon-coated lithium iron phosphate and cathode material technology, which is applied to battery electrodes, electrochemical generators, electrical components, etc., can solve the agglomeration of lithium iron phosphate materials, uneven particle size distribution, and deterioration of the electrochemical performance of lithium iron phosphate, etc. problems, to achieve the effects of improving high-current charge-discharge performance and cycle performance, reducing production costs, and simplifying the synthesis process

Inactive Publication Date: 2016-02-17
FUJIAN NORMAL UNIV
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Problems solved by technology

However, the small droplets under the action of the carrier gas cannot avoid the collision between the small droplets during the transmission process, which leads to the agglomeration phenomenon and the uneven particle size distribution of the lithium iron phosphate material, which eventually deteriorates the electrochemical performance of the lithium iron phosphate.

Method used

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  • Method for preparing spherical carbon-coated lithium iron phosphate positive electrode material through atomization method
  • Method for preparing spherical carbon-coated lithium iron phosphate positive electrode material through atomization method
  • Method for preparing spherical carbon-coated lithium iron phosphate positive electrode material through atomization method

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Embodiment 1

[0038] Dissolve 8.40 grams of citric acid in 400 milliliters of deionized water, stir magnetically for 1 hour at room temperature, weigh 16.16 grams of ferric nitrate trihydrate, 2.84 grams of lithium nitrate, 1.10 grams of sucrose, and 4.74 grams of ammonium dihydrogen phosphate to the mixture , adding concentrated ammonia water dropwise to adjust the pH value of the solution and stirring continuously, the final pH value of the solution is about 6.5. Put the mixed solution after adjusting the PH value in an 80°C water bath for 3 hours and then put it into an ultrasonic atomization device, set the atomization volume to 0.4 ml per minute, and turn on the piezoelectric ceramic chip with a frequency of 1.7MHz. The atomized liquid droplets produced are loaded into the tube furnace (the inner diameter of the quartz tube of the tube furnace is 20mm and the outer diameter is 25mm) at a temperature of 550°C by the vacuum pump, and the atomized liquid droplets are placed in the quartz t...

Embodiment 2

[0042] Dissolve 8.20 g of citric acid in 300 ml of deionized water, stir magnetically at room temperature for 30 minutes, weigh 4.15 g of lithium dihydrogen phosphate, 10.81 g of ferric chloride hexahydrate, and 1.20 g of glucose into the mixture, and add Ethylenediamine adjusts the pH value of the solution and keeps stirring, and the final pH value of the solution is about 7. Put the mixed solution after adjusting the pH value in a water bath at 70°C for 1 hour, then put it into an ultrasonic atomization device, set the atomization volume to 0.6 ml per minute, and turn on the piezoelectric ceramic chip with a frequency of 2.4 MHz. The atomized liquid droplets produced are loaded into a tube furnace (the inner diameter of the quartz tube of the tube furnace is 50 mm and the outer diameter is 60 mm) at a temperature of 500 ° C by a vacuum pump, and the atomized liquid droplets are placed in the quartz tube The forward speed is 3cm / s, and the precursor powder generated after the...

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Abstract

The present invention relates to a method for preparing a spherical carbon-coated lithium iron phosphate positive electrode material through an atomization method. The technical scheme of the present invention comprises: 1, dissolving a lithium salt, an iron salt and a phosphate in water containing a carbon precursor, and uniformly mixing to obtain a clarified solution; 2, adjusting the pH value of the solution; 3, placing the solution in a water bath pot, continuously stirring, and carrying out reflux to obtain a precursor liquid for atomization; 4, atomizing the precursor liquid into small mist droplets, passing through a quartz tube furnace or corundum tube furnace, and collecting the dried spherical lithium iron phosphate precursor by using a powder collector; and 5, placing the spherical lithium iron phosphate precursor into an atmosphere furnace, and carrying out sintering and calcination to obtain the spherical carbon-coated lithium iron phosphate positive electrode material. According to the present invention, the chemical component, the phase component and the particle size of the spherical lithium iron phosphate are effectively controlled, the large current charge-discharge performance and the cycle performance of the lithium iron phosphate are improved, the synthesis process is provided, the production cost is reduced, the product quality is improved, and the method is suitable for industrial implementation application.

Description

Technical field: [0001] The invention relates to a method for preparing a spherical carbon-coated lithium iron phosphate positive electrode material by an atomization method, and belongs to the technical field of lithium ion battery material preparation. technical background [0002] Lithium-ion battery is a new generation of green high-energy battery. It has the advantages of high working voltage, large specific capacity, low self-discharge rate and long service life. It is widely used in portable digital devices, power tools and military equipment. It is used in electric vehicles. It also has good application prospects and is considered to be a high-tech product that is of great significance to the national economy and people's lives in the 21st century. [0003] Cathode materials are an important part of lithium-ion batteries. Compared with other cathode materials such as LiCoO 2 , LiNiO 2 、LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , LiMn 2 o 4 , and LiFeSiO 4 etc. Lithium iro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/366H01M4/5825H01M10/0525Y02E60/10
Inventor 庄振源林应斌黄志高
Owner FUJIAN NORMAL UNIV
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