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Method for recycling lithium, iron and current collector-aluminum foil in positive electrode material of waste lithium iron phosphate battery

A lithium iron phosphate battery and positive electrode material technology, which is applied in battery recycling, recycling technology, waste collector recycling, etc., can solve the problems of iron phosphate price increase, lithium salt price increase, resource waste, etc., and achieve low processing cost, The effect of high recovery rate and convenient recycling

Inactive Publication Date: 2017-09-22
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these waste materials are discarded directly, it will undoubtedly be a huge waste of resources
Especially with the increasing demand for lithium batteries for new energy vehicles, the prices of various lithium salts have risen rapidly, and more and more manufacturers of lithium iron phosphate batteries use iron phosphate as the precursor for the synthesis of lithium iron phosphate , also led to an increase in the price of iron phosphate

Method used

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  • Method for recycling lithium, iron and current collector-aluminum foil in positive electrode material of waste lithium iron phosphate battery
  • Method for recycling lithium, iron and current collector-aluminum foil in positive electrode material of waste lithium iron phosphate battery
  • Method for recycling lithium, iron and current collector-aluminum foil in positive electrode material of waste lithium iron phosphate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Place the positive electrode sheet of the waste lithium iron phosphate battery to be recovered in a 0.1mol / L sodium hydroxide solution for stirring, ultrasonic treatment, and after the active material lithium iron phosphate mixed material is completely detached from the aluminum foil, remove the aluminum foil from the aluminum foil It can be directly recovered after being separated from the lye.

[0041] (2) After filtering and separating the lithium iron phosphate mixed material in the lye in step (1), put it in an oven at 80° C. for 10 hours to dry.

[0042] (3) Place the dried lithium iron phosphate mixed material in step (2) in a kiln at 500° C. for calcination for 5 hours. The calcined mixed material is subjected to ball milling, and the powder after ball milling is sieved by vibration. The sieve The net is 500 mesh.

[0043] (4) Put the mixed material calcined in step (3) into 4 mol / L sulfuric acid solution and stir for 6 hours to completely dissolve it.

[...

Embodiment 2

[0051] (1) Place the positive electrode sheet of the waste lithium iron phosphate battery to be recovered in 0.2mol / L potassium hydroxide solution for stirring, ultrasonic treatment, after the active material lithium iron phosphate mixed material is completely detached from the aluminum foil, remove the aluminum foil from the aluminum foil It can be directly recovered after being separated from the lye.

[0052] (2) After filtering and separating the lithium iron phosphate mixed material in the lye in step (1), put it into an oven at 80° C. to dry for 8 hours.

[0053] (3) Place the dried lithium iron phosphate mixed material in step (2) in a kiln at 400° C. for calcination for 6 hours. The calcined mixed material is ball milled, and the powder after ball milling is sieved by vibration. The sieve The net is 600 mesh.

[0054] (4) Put the mixed material calcined in step (3) into 6 mol / L hydrochloric acid solution and stir for 4 hours to completely dissolve it.

[0055] (5) Sl...

Embodiment 3

[0062] (1) Place the recovered positive electrode waste material of lithium iron phosphate battery in 0.5mol / L lithium hydroxide solution for stirring, ultrasonic treatment, after the active material lithium iron phosphate mixed material is completely detached from the aluminum foil, remove the aluminum foil from the alkali It can be recovered directly after being separated from the liquid.

[0063] (2) After filtering and separating the lithium iron phosphate mixed material in the lye in step (1), put it into an oven at 80° C. to dry for 8 hours.

[0064] (3) Place the dried lithium iron phosphate mixed material in step (2) in a kiln at 600° C. for calcination for 3 hours. The calcined mixed material is subjected to ball milling, and the powder after ball milling is sieved by vibration. The sieve The net is 300 mesh.

[0065] (4) Put the mixed material calcined in step (3) into 2 mol / L nitric acid solution and stir for 6 hours to dissolve it completely.

[0066] (5) Slowly ...

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Abstract

The invention discloses a method for recycling lithium, iron and current collector-aluminum foil in a positive electrode material of a waste lithium iron phosphate battery. The method comprises the steps that firstly, the positive electrode material of the waste lithium iron phosphate battery is arranged in an alkaline solution to be subjected to stirring and ultrasonic treatment, and after a lithium iron phosphate positive electrode mixed material completely disengages from aluminum foil, the aluminum foil is directly recycled after being separated from the alkaline solution; then the lithium iron phosphate positive electrode mixed material is filtered and separated out from the alkaline solution and then is subjected to roasting, ball milling and screening; then the lithium iron phosphate positive electrode mixed material is immersed in acid liquor to be dissolved, the pH value is adjusted, the iron element is deposited in the form of iron phosphate, and filtering and separating are conducted; the filter liquor is continuously adjusted to the neutralization, then phosphate is added, and the lithium element is deposited in the form of lithium phosphate. The method is simple and effective, the main elements of iron, lithium and current collector-aluminum foil in the positive electrode material of the waste lithium iron phosphate battery can be effectively recycled, the recycling rate is high, low-concentration acid liquor and low-concentration alkaline liquor are adopted, secondary pollution is not generated, the valuable elements are all recycled, and atom economy is achieved.

Description

technical field [0001] The invention is applied to the field of processing and recycling of lithium-ion battery positive electrode waste materials, more specifically, it is a method for recovering various useful elements in lithium iron phosphate positive electrode waste materials. Background technique [0002] Since the world's first commercial lithium-ion battery was introduced to the market by Sony of Japan in 1991, the lithium-ion battery industry has experienced more than 20 years of development. Secondary batteries have developed into the preferred batteries for 3C electronic products, electric vehicles and energy storage. [0003] In recent years, with the decrease of fossil resources and the seriousness of environmental problems such as smog, the development of electric vehicles has been highly valued by governments of various countries. The key to the development of electric vehicles lies in batteries. Lithium-ion battery has become an ideal power source for a new...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B21/00C22B26/12H01M10/54
CPCC22B7/007C22B21/0069C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 王先友王轩余睿智张蕊
Owner XIANGTAN UNIV
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