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Synthesis process of battery-grade iron phosphate

A synthesis process, the technology of iron phosphate, applied in the direction of phosphorus compounds, battery electrodes, circuits, etc., can solve the problems of poor product stability and consistency, low product purity, high production cost, and achieve stability and consistency guarantee, impurities Less, less product differences

Pending Publication Date: 2019-12-06
襄阳泽东新能源发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a synthesis process of battery-grade iron phosphate, which solves at least one of the following problems: 1. High production cost; 2. Poor product stability and consistency; 3. Low product purity

Method used

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  • Synthesis process of battery-grade iron phosphate
  • Synthesis process of battery-grade iron phosphate
  • Synthesis process of battery-grade iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 500g of titanium dioxide by-product ferrous sulfate, configure it into a ferrous sulfate solution with an iron concentration of 0.5mol / L, set the pH at 1-1.2 (adjustable with phosphoric acid or sulfuric acid), then add 20g of adsorbent to control the stirring speed 100r / min, stir at room temperature for 30min, add 10g flocculant, stir for 5min, stop stirring and let the material rest for 10min. Then filter to remove impurities until the solution is completely clear, and the obtained ferrous solution is ready for use.

[0028] Take 500 mL of the above purified and purified ferrous sulfate solution, add concentrated sulfuric acid (or phosphoric acid) to adjust the pH of the solution to 0.5. With the ferrous sulfate solution after above-mentioned acidification, phosphorus content is the phosphate solution 250ml of 1mol / L, 30% hydrogen peroxide 15.45ml, three are added dropwise in the reaction system simultaneously, and system pH is stabilized at 0.5 (using ammonia...

Embodiment 2

[0030] Dissolve 500g of titanium dioxide by-product ferrous sulfate, configure it into a ferrous sulfate solution with an iron concentration of 0.75mol / L, set the pH at 1.2-1.8, then add 25g of adsorbent, control the stirring speed at 150r / min, and stir at room temperature for 30min , add 15g flocculant, stir for 5min, stop stirring and let the material rest for 10min. The material is filtered for many times to remove impurities until the solution is completely clear, and the obtained ferrous solution is ready for use.

[0031] Take 500 mL of the above purified and purified ferrous sulfate solution, add concentrated sulfuric acid or ammonia water to adjust the pH of the solution to 1.25. With acidified ferrous sulfate solution, phosphorus content is 288ml of phosphate solution of 1.5mol / L, 34.77ml of 30% hydrogen peroxide, the three are added dropwise in the reaction system at the same time, and the pH of the system is stabilized at 1.5 (using ammonia or phosphoric acid Adjus...

Embodiment 3

[0033] Dissolve 500g of titanium dioxide by-product ferrous sulfate, configure it into a ferrous sulfate solution with an iron concentration of 1mol / L, set the pH at 1.8-2.5, then add 30g of adsorbent, control the stirring speed at 200r / min, and stir at room temperature for 30min. Add 20g flocculant, stir for 5min, stop stirring and let the material rest for 10min. The material is filtered for many times to remove impurities until the solution is completely clear, and the obtained ferrous solution is ready for use.

[0034]Take 500 mL of the above-mentioned purified and purified ferrous sulfate solution, add concentrated sulfuric acid or ammonia water to adjust the pH=2 of the solution. With acidified ferrous sulfate solution, phosphorus content is 325ml of phosphate solution of 2mol / L, 61.82ml of 30% hydrogen peroxide, the three are added dropwise in the reaction system at the same time, and the pH of the system is stabilized at 2.5 (adjusted by ammonia or phosphoric acid) )...

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Abstract

The invention discloses a synthesis process of battery-grade iron phosphate. The process comprises impurity removal and purification of ferrous sulfate and synthesis of iron phosphate. At least one ofthe following problems is solved: 1, the difficult problem of high production cost of iron phosphate at present is solved by using titanium dioxide by-product ferrous sulfate as a raw material; 2, full parameter control of a production process is realized, so that disadvantages existing in a traditional process, such as an uneven reaction time and change of a reaction solution pH value, are eliminated, and thereby the size and shape of obtained iron phosphate crystals is consistent, stability and consistency of a product are fully guaranteed, and product differences between batches are small;and 3, impurities are less, and high quality of the product is realized.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a synthesis process of battery-grade iron phosphate. Background technique [0002] With the vigorous development of the lithium-ion battery industry, the research on lithium-ion battery cathode materials is also getting more and more in-depth. As one of the most important members of lithium-ion battery cathode materials, lithium iron phosphate has been widely used in automobiles, electric tools, energy storage equipment, emergency power supply equipment and mobile power supplies. The synthesis process of lithium iron phosphate mostly uses iron phosphate as the raw material, because the internal structure of iron phosphate is similar to that of lithium iron phosphate, which can enable lithium iron phosphate to obtain better electrochemical performance. High-quality iron phosphate is the key material for producing high-quality lithium iron phosphate, and iron phosphate is mostly...

Claims

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Application Information

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IPC IPC(8): C01B25/37H01M4/58
CPCC01B25/375H01M4/5825C01P2006/11C01P2006/12Y02E60/10
Inventor 宋开荣刘雄才郭勇张红胜王强胜
Owner 襄阳泽东新能源发展有限公司
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