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Manufacturing method for lithium iron phosphate cathode material

A lithium iron phosphate and cathode material technology, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve problems such as inability to meet users, and achieve the effects of good charge and discharge life, uniform mixing, and stable quality characteristics

Inactive Publication Date: 2012-05-23
GREEN ENERGY ELECTRODE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the generally used ones cannot meet the needs of users in actual use; it is necessary to develop a high-rate discharge with simple manufacturing process, low manufacturing cost, industrial mass production, high gram capacity, and better Performance and cycle life are the issues to be solved by this patent

Method used

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  • Manufacturing method for lithium iron phosphate cathode material
  • Manufacturing method for lithium iron phosphate cathode material
  • Manufacturing method for lithium iron phosphate cathode material

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Choose FeC among the compounds containing Li, Fe, P 2 o 4 . 2H 2 O as a water-insoluble compound, LiH 2 PO 4 As a water-soluble compound, zinc oxide (ZnO) is used as the iron position substitution compound (Zn is used as the dopant element replacing iron), and PVP is used as the carbon source. where the LiH 2 PO 4 The preparation includes: first take 3.794kg of lithium carbonate, add 20kg of deionized water, while stirring, add 11.76kg of 85% H 3 PO 4 , by Li 2 CO 3 will be with H 3 PO 4 reaction to generate water-soluble LiH 2 PO 4 and carbon dioxide (CO 2 ). Next, add 0.26Kg of dispersant FN265 and 0.905Kg of carbon source material PVP to the aforementioned aqueous solution, stir together evenly, and then add 17.194Kg of FeC 2 o 4 . 2H 2 O and 0.407Kg of ZnO. Next, grind the aforementioned mixed slurry 4 times with a bead mill to produce a uniformly dispersed ceramic slurry containing Li, Fe, and P elements. At this time, the particle size of the c...

Embodiment 2

[0056] In addition to the material structure mentioned in the above-mentioned embodiments, the method of the present invention can also be the material structure of another embodiment, and the difference is that FeC 2 o 4 . 2H 2 O as a water-insoluble compound, LiH 2 PO 4 As a water-soluble compound, titanium dioxide (TiO 2 ) as the iron position substitution compound (with Ti as the dopant element replacing iron), and ascorbic acid as the carbon source. When preparing, weigh 10.50Kg of LiH 2 PO 4 , dissolved in 18Kg of deionized water, then added 0.28Kg of dispersant BYK180, and 1.80Kg of carbon source material - ascorbic acid, after stirring, then added 16.76Kg of FeC 2 o 4 . 2H 2 O and 0.60kg of TiO 2 . Then, the processes of grinding and mixing, spray granulation, reducing atmosphere calcination, and crushing were carried out as in the above-mentioned Example 1 to produce titanium-containing carbon-coated lithium iron phosphate powder, wherein the condition of ...

Embodiment 3

[0059] In addition to the material structure mentioned in the above-mentioned embodiment, the method of the present invention can also be the material structure of another embodiment, and the difference is that Li 3 PO 4 As a source of water-insoluble Li and P, (CH 3 COO) 2 Fe as a water-soluble iron source, manganese carbonate (MnCO 3 ) as the iron position substitution compound (with Mn as the dopant element replacing iron), and glucose as the carbon source. When preparing, weigh 17.393Kg (CH 3 COO) 2 Fe, dissolved in 22Kg of deionized water, then added 1.6Kg of glucose and 0.32Kg of dispersant 1221, after stirring, then added 10.85Kg of Li 3 PO 4 and 0.92Kg of MnCO 3 . Then, the processes of grinding and mixing, spray granulation, reducing atmosphere calcination, and crushing were carried out as in the above-mentioned Example 1 to produce manganese-containing carbon-coated lithium iron phosphate powder, wherein the condition of reducing atmosphere calcination was si...

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Abstract

The invention relates to a manufacturing method for a lithium iron phosphate cathode material. The reactivity and the uniformity of raw materials are improved by adopting a semi-chemical method, and the raw materials used for manufacturing lithium iron phosphate materials are divided into water-soluble raw materials and water-insoluble raw materials. The manufacturing method comprises the following steps of: firstly, dissolving the water-soluble raw materials into water, adding the water-insoluble raw materials, adding a dispersing agent, a carbon source and a compound of iron position substituting elements, and grinding and uniformly mixing the raw materials to form slurry with all components of lithium iron phosphate; secondly, preparing the uniformly mixed slurry into precursor powder in a spray granulation manner; and finally, calcining the precursor powder at the temperature of between 600 and 800 DEG C for 1 to 24 hours in reducing atmosphere, and crushing the calcined powder to obtain finished products. The manufacturing process is simple and suitable for mass production, the raw materials are uniformly mixed, the properties of the products are consistent, the prepared lithium iron phosphate has stable quality characteristics, and the products have long charge and discharge service life and higher charge and discharge capacity, so that related problems of the conventional lithium iron phosphate production are solved.

Description

technical field [0001] The invention relates to a manufacturing method of a lithium iron phosphate positive electrode material, in particular to a manufacturing method of a lithium battery positive electrode material, in particular to a semichemical method for preparing a lithium iron phosphate positive electrode material. Background technique [0002] When the electronic industry is booming and 3C electronic products are widely used, the demand for portable energy is increasing day by day. Coupled with the trend of advocating energy saving and carbon reduction in recent years, it has further promoted the rapid development of electric vehicles and promoted the vigorous development of the battery industry. Among all kinds of batteries, lithium secondary batteries have the advantages of high energy density, stable discharge voltage, long cycle life and no memory effect, so they have been widely used in various fields. [0003] Lithium iron phosphate cathode material has the ad...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/58C01B25/45
CPCY02E60/122Y02E60/10
Inventor 林居南张成裕林荣正赖怡文
Owner GREEN ENERGY ELECTRODE
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