Method for recovering and recycling waste positive electrode material during production process of lithium iron phosphate battery

A lithium iron phosphate battery and production link technology, applied in battery recycling, recycling technology, battery electrodes and other directions, can solve problems such as poor performance of lithium iron phosphate materials, short service life of battery packs, and hidden safety hazards, and achieve recycling and repair. Simple process, easy recycling, low energy consumption

Inactive Publication Date: 2017-03-15
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high temperature performance, cycle performance and storage performance of lithium manganate are poor, and the service life of the battery pack is short
In terms of vehicle safety design, China's new energy vehicles use ternary lithium batteries as power batteries, and there are certain safety hazards
The deoxidation temperature of the ternary material is 200°C, and the heat release energy exceeds 800J/g. The ternary lithium battery cannot pass the acupuncture

Method used

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  • Method for recovering and recycling waste positive electrode material during production process of lithium iron phosphate battery
  • Method for recovering and recycling waste positive electrode material during production process of lithium iron phosphate battery
  • Method for recovering and recycling waste positive electrode material during production process of lithium iron phosphate battery

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) Put 500g of waste lithium iron phosphate positive electrode into 500mL of 0.05mol / L sodium hydroxide solution, soak for 10 minutes and start stirring. After the material is completely separated from the aluminum foil, remove the aluminum foil;

[0043] (2) filtering and washing mixed materials such as lithium iron phosphate, conductive agent, binding agent remaining in the lye of step (1);

[0044] (3) Put the lithium iron phosphate mixed material washed in step (2) into an oven at 80° C. for 24 hours to dry.

[0045](4) ball milling the dried lithium iron phosphate mixed material in step (3), the ball milling speed is 500rpm, and the powder after ball milling is sieved by vibration, using a 500-mesh screen;

[0046] (5) Soak the lithium iron phosphate mixed material powder obtained in step (4) in NMP, stir and ultrasonically treat for 4 hours, and remove the binder therein;

[0047] (6) After filtering and drying the lithium iron phosphate material obtained in ste...

Embodiment 2

[0052] (1) Put 500g of waste lithium iron phosphate positive electrode into 500mL 0.5mol / L potassium hydroxide solution, soak for 10 minutes and start stirring, and remove the aluminum foil after the material is completely separated from the aluminum foil;

[0053] (2) filtering and washing mixed materials such as lithium iron phosphate, conductive agent, binding agent remaining in the lye of step (1);

[0054] (3) Put the lithium iron phosphate mixed material washed in step (2) into an oven at 100° C. for 24 hours;

[0055] (4) ball milling the dried lithium iron phosphate mixed material in step (3), the ball milling speed is 400rpm, and the powder after ball milling is sieved by vibration, using a 400-mesh screen;

[0056] (5) Soak the lithium iron phosphate mixed material powder obtained in step (4) in DMF, stir and sonicate for 2 hours, and remove the binder therein;

[0057] (6) After filtering and drying the lithium iron phosphate material obtained in step (5), place it...

Embodiment 3

[0062] (1) First put 500g of waste lithium iron phosphate positive electrode into 500mL of 1mol / L sodium hydroxide solution, soak for 10min and start stirring, and remove the aluminum foil after the material is completely separated from the aluminum foil.

[0063] (2) Filtrating and washing the remaining mixed materials such as lithium iron phosphate, conductive agent and binder in the lye of step (1).

[0064] (3) Put the lithium iron phosphate mixed material washed in step (2) into an oven at 80° C. for 24 hours to dry.

[0065] (4) Perform ball milling on the dried lithium iron phosphate mixed material in step (3), the ball milling speed is 600 rpm, and the powder after ball milling is sieved by vibration, using a 600-mesh sieve.

[0066] (5) Soak the lithium iron phosphate mixed material powder obtained in step (4) in DMF, stir and sonicate for 1 hour, and remove the binder therein;

[0067] (6) After filtering and drying the lithium iron phosphate material obtained in st...

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Abstract

The invention discloses a method for recovering and recycling a waste positive electrode material during production process of a lithium iron phosphate battery. The method comprises the following steps of firstly, placing a lithium iron phosphate positive plate which is obtained by recycling in an alkaline solution, and separating an aluminum foil from the alkaline solution after the aluminum foil is completely separated; secondly, filtering and washing a lithium iron phosphate positive electrode mixed material in the alkaline solution, and then performing drying, ball-milling and sieving; and finally, immersing sieved lithium iron phosphate positive electrode mixed material powder in an organic solvent, performing stirring to remove a binding agent in the mixed material, performing filtering and washing, and performing thermal treatment such as roasting and calcination after drying to obtain a lithium iron phosphate positive electrode material with excellent performance. By the method, waste lithium iron phosphate can be recovered to acquire electrical property equivalent to that of a newly-prepared product, the aluminum foil can be reserved to the greatest extent and is convenient to recycle by an aluminum factory, the thermal treatment temperature required during the whole process is relatively low, and the process is simple and environment friendly.

Description

technical field [0001] The invention relates to the field of processing and recycling of lithium-ion battery waste materials, in particular to a method for recycling, repairing and reusing positive electrode waste materials in the production process of lithium iron phosphate batteries. 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...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M10/058H01M4/58C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/5825H01M10/058H01M10/54Y02E60/10Y02W30/84Y02P70/50
Inventor 王先友王轩余睿智王刚张蕊
Owner XIANGTAN UNIV
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