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Preparation method of ferrous lithium hydrogen phosphate

A technology of lithium iron phosphate water and phosphoric acid, which is applied in the field of preparation of lithium iron phosphate monohydrate, can solve the problems of poor electrical conductivity and shorten the diffusion path of lithium ions, and achieve simplified operation steps, shortened diffusion path, and easy operation Effect

Active Publication Date: 2014-07-30
JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium iron phosphate prepared by the current preparation method generally has the problem of poor electrical conductivity. How to improve the preparation of lithium iron phosphate so as to increase the contact area between the lithium iron phosphate material and the electrolyte and shorten the diffusion path of lithium ions , which is of great significance to improve the performance of lithium iron phosphate materials and meet the needs of power batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh 55.6g of ferrous sulfate heptahydrate and 23.3g of phosphoric acid with a mass concentration of 85% dissolved in pure water to make 400mL of ferrous sulfate and phosphoric acid mixed solution, weigh 25.4g of lithium hydroxide monohydrate and dissolve in pure water to make 400mL of hydrogen Lithium oxide solution, then add 800mL of pure water into a 2000mL three-neck flask with a stirring and heating reflux device, stir and heat to boiling, then keep stirring and reflux while adding ferrous sulfate phosphoric acid mixed solution and lithium hydroxide dropwise into the three-necked flask Solution, control the dropwise addition for 60 minutes at the same time, continue to stir and reflux for 4 hours after the addition, then separate the solid from the liquid, and wash with 50°C pure water, and dry the washed solid at 100°C to obtain lithium iron phosphate monohydrate solid.

Embodiment 2

[0016] Weigh 22.24g of ferrous sulfate heptahydrate and 9.41g of phosphoric acid with a mass concentration of 85% dissolved in pure water to make 400mL of ferrous sulfate and phosphoric acid mixed solution, weigh 10.27g of lithium hydroxide monohydrate and dissolve in pure water to make 400mL of hydrogen Lithium oxide solution, then add 600mL of pure water into a 2000mL three-necked flask with a stirring and heating reflux device, stir and heat to boiling, then keep stirring and reflux while adding ferrous sulfate phosphoric acid mixture and lithium hydroxide dropwise into the three-necked flask Solution, control 20 minutes and drop it at the same time, continue to stir and reflux for 2 hours after the addition, then separate the solid from the liquid, and wash with 40°C pure water, and dry the washed solid at 150°C to obtain lithium iron phosphate monohydrate solid.

Embodiment 3

[0018] Weigh 88.96g of ferrous sulfate heptahydrate and 36.89g of phosphoric acid with a mass concentration of 85% dissolved in pure water to make 400mL of ferrous sulfate and phosphoric acid mixed solution, weigh 40.26g of lithium hydroxide monohydrate and dissolve in pure water to make 400mL of hydrogen Lithium oxide solution, then add 1000mL of pure water into a 2000mL three-neck flask with a stirring and heating reflux device, stir and heat to boiling, then keep stirring and reflux while adding ferrous sulfate phosphoric acid mixture and lithium hydroxide dropwise into the three-necked flask Solution, control 120 minutes and drop it at the same time, continue to stir and reflux for 8 hours after the addition, then separate the solid from the liquid, and wash with 60°C pure water, and dry the washed solid at 80°C to obtain lithium iron phosphate monohydrate solid.

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Abstract

The invention discloses a preparation method of ferrous lithium hydrogen phosphate. The preparation method sequentially comprises the following steps of: preparing ferrite phosphoric acid mixed solution by using soluble ferrite and phosphoric acid; preparing lithium hydroxide solution by using lithium hydroxide; adding pure water into a three-opening flask, and stirring and synchronously dropwise adding the ferrite phosphoric acid mixed solution and the lithium hydroxide solution in case of normal pressure backflow in a heating way; synchronously dropwise adding the ferrite phosphoric acid mixed solution and the lithium hydroxide solution, continuously stirring, and reflowing for 2-8 hours in a heating way, and carrying out solid-liquid separating and washing; and drying the washed solid to obtain the ferrous lithium hydrogen phosphate. The preparation method has the advantages that according to the preparation method, the commercially available lithium source, phosphorus source and iron source have a heating reflow reaction in case of liquid phase under normal pressure, so that the ferrous lithium hydrogen phosphate can be obtained. The raw materials are easy to obtain, and the preparation method is easy to operate, and low in energy consumption. The ferrous lithium phosphate can be easily prepared from the ferrous lithium hydrogen phosphate, compared with the existing preparation method of the ferrous lithium hydrogen phosphate, the preparation method greatly shortens the process route, and greatly simplifies the operation steps.

Description

technical field [0001] The invention relates to a preparation method of lithium iron phosphate monohydrate. Background technique [0002] Lithium iron phosphate is a new anode material for lithium-ion batteries. The lithium iron phosphate prepared by the current preparation method generally has the problem of poor electrical conductivity. How to improve the preparation of lithium iron phosphate so as to increase the contact area between the lithium iron phosphate material and the electrolyte and shorten the diffusion path of lithium ions , which is of great significance to improve the performance of lithium iron phosphate material and meet the needs of power batteries. Therefore, a new process technology should be provided to solve the above problems. Contents of the invention [0003] The objective of the invention is: provide a kind of preparation method of lithium ferrous phosphate monohydrate. [0004] The technical scheme adopted in the present invention is: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/10
Inventor 何国端江迎娣李南平
Owner JIANGSU RONGHUI GENERAL LITHIUM IND CO LTD
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