Method for preparing lithium iron phosphate material

A lithium iron phosphate and phosphate technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of uneven dispersion of conductive agents, affecting the conductivity of positive active materials, etc., and achieve low production costs and synthesis technology. Simple and easy to implement, the effect of uniform particle size and morphology

Inactive Publication Date: 2012-01-04
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using the solid-phase method, it is difficult to mix various solid components fully, so the various components in the obtained lithium iron phosphate positive electrode active material, especially the conductive agent, are not uniformly dispersed, which directly affects the conductivity of the positive electrode active material.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of lithium iron phosphate material comprises the following steps:

[0026] 1) Accurately weigh (NH 4 ) 3 PO 4 149g (1mol), FeCl 2 126.75g (1mol) and 77.82g (3mol) of LiF were dissolved in 500ml of water respectively, fully dissolved and mixed by magnetic stirring, and prepared into a homogeneous solution without visible crystal particles. Under the action of a mechanical stirring paddle (rotating speed=400 rpm), pour the three prepared solutions into a large round-bottomed flask in turn while stirring, and use phosphoric acid to adjust the pH value to 7.

[0027] Use an oil bath (silicon oil) to heat at 120° C. for 2 h, and simultaneously stir with a mechanical stirrer (rotational speed = 350 rpm) while heating. After the heating is completed, a precipitate (lithium iron phosphate nanoparticle) is formed at the bottom, and the colloidal precipitate is filtered out by vacuum filtration, and washed and filtered repeatedly with water to obtain ...

Embodiment 2

[0033] The preparation method of lithium iron phosphate material, comprises the following steps:

[0034] 1) Accurately weigh (NH 4 ) 3 PO 4 149g (1mol), FeCl 2 126.75g (1mol) and 1.88g (2mol) of LiF were dissolved in 500ml of water respectively, fully dissolved and mixed by magnetic stirring, and prepared into a uniform solution without visible crystal particles. Under the action of a mechanical stirring paddle (rotating speed = 380 rpm), pour the three prepared solutions into a large round-bottomed flask in turn while stirring, and adjust the pH value to 7.5.

[0035] Use an oil bath (silicon oil) to heat at 100° C. for 2 h, and simultaneously stir with a mechanical stirrer (rotational speed = 300 rpm) while heating. After the heating is completed, a precipitate (lithium iron phosphate nanoparticle) is formed at the bottom, and the colloidal precipitate is filtered out by vacuum filtration, and washed and filtered repeatedly with water to obtain lithium iron phosphate ...

Embodiment 3

[0040] The preparation method of lithium iron phosphate material comprises the following steps:

[0041] 1) Accurately weigh (NH 4 ) 3 PO 4 149g, FeCl 2 126.75g, LiF 25.94g (1mol), and then dissolved in 1000ml of water, fully dissolved and mixed by magnetic stirring, and prepared into a uniform solution, and no visible crystal particles were visible. Under the action of a mechanical stirring paddle (rotating speed=400 rpm), pour the three prepared solutions into a large round-bottomed flask successively while stirring, and adjust the pH value to 8. Use an oil bath (silicon oil) to heat at 130° C. for 1 h, while heating, use a mechanical stirrer (rotational speed = 400 rpm) to carry out simultaneous stirring. After the heating is completed, a precipitate (lithium iron phosphate nanoparticle) is formed at the bottom, and the colloidal precipitate is filtered out by vacuum filtration, and washed and filtered repeatedly with water to obtain lithium iron phosphate micropartic...

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Abstract

The invention discloses a method for preparing a lithium ion battery anode material LiFePO4. The method comprises the following steps of: improving the tap density and volumetric capacity by sphering lithium iron phosphate particles, wherein the lithium iron phosphate particles are nanoscale lithium iron phosphate microparticles prepared by a coprecipitation method, which serve as a matrix; uniformly dispersing the lithium iron phosphate microparticles in ethylene glycol, and forming spherical carbon-coated secondary lithium iron phosphate particles through spray drying and physical adhesion;and finally sintering to obtain the lithium ion battery anode material LiFePO4. The lithium ion battery anode material LiFePO4 prepared by the method is subjected to SEM detection, and the particles are spherical and uniform in topography, has a little fine powder, and can effectively increase the tap density.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials of lithium ion batteries, and relates to a preparation method of lithium iron phosphate materials. Background technique [0002] Lithium-ion batteries are widely used in various electronic devices, such as laptop computers, mobile phone batteries, digital cameras, portable lighting equipment, etc. At the same time, it is also used in electric tools, electric bicycles and electric vehicles. With the gradual consumption of the world's oil resources and the gradual improvement of society's requirements for environmental protection, electric vehicles have obtained unprecedented development opportunities. Using lithium-ion batteries as the power source of electric vehicles is the development direction of electric vehicles. [0003] In lithium-ion batteries, the cathode material occupies a very important position and is also the focus of the current development of lithium-ion batt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 刘石磊
Owner IRICO
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