Method for recycling positive electrode material of waste lithium iron phosphate battery

A lithium iron phosphate battery, waste technology, applied in the direction of battery recycling, waste collector recycling, positive electrodes, etc., can solve the problems of difficult realization, high cost, large investment in equipment, etc.

Pending Publication Date: 2021-12-03
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Most of the recycling and treatment methods of waste lithium iron phosphate batteries are in the laboratory research stage, and some methods are not easy to realize in real

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1 A method for recovering positive electrode materials of waste lithium iron phosphate batteries comprises the following steps:

[0047] (1) Add 100g of lithium iron phosphate positive electrode powder to 500mL of water for slurrying and preheating, then add sulfuric acid for leaching. The leaching temperature is 70°C, and the leaching time is 4h. Lithium, which also contains traces of copper and aluminum.

[0048] (2) Add lye to the leaching solution to adjust the pH value to 2.0, add 0.5g iron powder to replace and remove copper, the copper removal time is 0.5h, continue to add lye to adjust the pH value to 3.3, and carry out aluminum removal. The aluminum removal time is 6h, and the solid-liquid separation is obtained. Solution after cleaning.

[0049] (3) After removing impurities, add 3 g of sodium phosphate to the leachate.

[0050] (4) Add 150mL of pure water to the beaker, place it in a water bath to preheat, the synthesis temperature is 55°C, add a...

Embodiment 2

[0052] Embodiment 2 A method for recycling positive electrode materials of waste lithium iron phosphate batteries, comprising the following steps:

[0053] ⑴ Add 5L of water to slurry 1kg of lithium iron phosphate positive electrode powder and preheat it, then add sulfuric acid for leaching. The leaching temperature is 80°C, and the leaching time is 3h. Lithium, which also contains traces of copper and aluminum.

[0054] (2) Add lye to the leaching solution to adjust the pH value to 1.5, add 4.5g of iron powder to replace and remove copper, the copper removal time is 0.5h, continue to add lye to adjust the pH value to 3.5, and carry out aluminum removal. The aluminum removal time is 7h, and the solid-liquid separation is obtained. Solution after cleaning.

[0055] (3) After removing impurities, add 27 g of sodium phosphate to the leachate.

[0056] (4) Add 1.5L of pure water to the reactor, preheat it in a water bath, set the synthesis temperature at 60°C, add acid to adjust...

Embodiment 3

[0058] Embodiment 3 A method for recycling positive electrode materials of waste lithium iron phosphate batteries, comprising the following steps:

[0059] (1) Lithium iron phosphate positive electrode powder 10kg, add water 50L slurry to preheat, add sulfuric acid for leaching, leaching temperature is 75°C, leaching time is 4h, after leaching is completed, solid-liquid separation is obtained to obtain leaching liquid and leaching residue, the leaching liquid mainly contains phosphorus, iron and Lithium, which also contains traces of copper and aluminum.

[0060] (2) Add lye to the leaching solution to adjust the pH value to 1.5, add 405g of iron powder to replace and remove copper, the copper removal time is 1h, continue to add lye to adjust the pH value to 3.5, and carry out aluminum removal, the aluminum removal time is 7h, solid-liquid separation, and impurity removal After solution.

[0061] (3) After removing impurities, add 226 g of sodium phosphate to the leachate.

...

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Abstract

The invention relates to a method for recycling a positive electrode material of a waste lithium iron phosphate battery. The method comprises the following steps of: (1) adding water into positive electrode powder of the waste lithium iron phosphate battery to prepare slurry, preheating the slurry, adding 98% sulfuric acid for leaching, and performing solid-liquid separation after the leaching is completed to respectively obtain leachate and leaching residues; (2) adjusting the pH value of the leachate, adding iron powder to replace and remove copper, continuously adjusting the pH value, removing aluminum by precipitation, and carrying out solid-liquid separation to obtain an impurity-removed solution; (3) supplementing sodium phosphate to adjust the mass ratio of iron to phosphorus; (4) introducing hydrogen peroxide below the liquid level of the base solution, spraying alkali liquor and the impurity-removed solution by using spraying equipment, adjusting the pH value, aging for 5-7 hours after iron in the solution is completely oxidized and precipitated, and performing solid-liquid separation to respectively obtain an iron phosphate precipitate and a lithium-containing solution; and (5) adjusting the pH value of the lithium-containing solution, and carrying out evaporation concentration and solid-liquid separation to obtain filtrate; and introducing carbon dioxide into the filtrate to obtain precipitated lithium. The method is simple, efficient and easy for batch industrial production.

Description

technical field [0001] The invention relates to the technical field of recycling waste batteries, in particular to a method for recycling positive electrode materials of waste lithium iron phosphate batteries. Background technique [0002] Lithium iron phosphate has good cycle performance, low price, good safety, and has the potential of fast charging. Therefore, with the rapid development of the domestic electric vehicle industry, the demand for lithium iron phosphate batteries is also increasing rapidly. Lithium iron phosphate batteries are basically used in cars with high safety requirements. As these lithium iron phosphate batteries enter the end-of-life period, we have to face a difficult problem-the recycling of waste batteries. [0003] At present, the recycling of waste lithium iron phosphate power batteries is mainly based on the wet process. The pretreated waste lithium iron phosphate active materials are dissolved by acid leaching, and then purified to remove imp...

Claims

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Application Information

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IPC IPC(8): C01B25/37C01D15/08H01M10/54
CPCC01B25/375C01D15/08H01M10/54H01M2004/028Y02E60/10Y02W30/84
Inventor 柴艮风曹笃盟汤波张明兰王甲琴吴晖君王悦陈天翼李兰兰吴芳何艳颉颐
Owner JINCHUAN GROUP LIMITED
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