In-situ regeneration method of waste lithium iron phosphate battery positive electrode material

A technology for lithium iron phosphate batteries and cathode materials, which is applied in battery recycling, chemical instruments and methods, phosphorus compounds, etc., can solve the problem that in-situ regeneration of lithium iron phosphate materials cannot be realized, the electrochemical performance of cathode materials cannot be guaranteed, and the material particles are uniform. It is difficult to guarantee the stability and other problems, so as to shorten the dismantling time, realize the mechanical dismantling, and the particle size is controllable and uniform.

Active Publication Date: 2019-12-17
SHENZHEN QINGYAN EQUIP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is to use manual disassembly to separate the positive and negative pole pieces, scrape off the powder, and then recover the lithium compound and iron phosphate respectively through acid leaching and pH adjustment. CN108470952A, CN108461857A, etc., in these disclosed treatment methods, the lithium iron phosphate material is not regenerated in situ, but the lithium element and the iron element are recovered separately, the consumption of acid and alkali is large, the recovery cost is high, and the treatment of the three wastes is difficult
Another method is to directly add lithium source, iron source or phosphorus source to prepare lithium iron phosphate material after calcining, such as the documents CN108550940A, CN108172922A, CN107634222

Method used

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  • In-situ regeneration method of waste lithium iron phosphate battery positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0039] Example 1:

[0040] S1 discharges the used lithium-ion battery in a 5% NaCl salt solution for 4 hours to make the battery voltage lower than 2V, and then automatically disassembles and separates the positive and negative mixed powders and the battery shell through physical methods such as crushing, magnetic separation, and screening. , Copper foil, aluminum foil and diaphragm, battery shell, copper foil, aluminum foil and diaphragm are directly recycled after disassembly;

[0041] S2 Add 200mL of 2M NaOH solution to 100g of the separated positive and negative electrode mixed powder at an ambient temperature of 25°C, and stir for 1 hour at a stirring rate of 500 rpm in a mixer to fully dissolve the positive and negative electrode mixed powder and separate solid and liquid. Then recover Al element from the filtrate;

[0042] S3 At 60℃, put the mixed powder of positive and negative electrodes filtered out in step S2 after removing Al into 1000mL 2M hydrochloric acid and react an...

Example Embodiment

[0047] Example 2:

[0048] S1 discharges the used lithium-ion battery through a charger and discharge machine for about 4 hours (multiple discharges to ensure that the battery voltage is less than 1V), and then automatically disassembles and separates the positive and negative mixed powder through physical methods such as crushing, magnetic separation, and screening , Battery case, copper foil, aluminum foil and diaphragm, the battery case, copper foil, aluminum foil and diaphragm are directly recycled after disassembly;

[0049] S2 Add 200g of the separated positive and negative electrode mixed powder to 500mL 2M NaOH solution at a temperature of 30℃, and stir for 2h at a stirring rate of 500rpm in a mixer to fully dissolve the positive and negative electrode mixed powder. Recover Al element from the filtrate;

[0050] S3 At 70℃, put the mixed powder of positive and negative electrodes filtered out in step S2 after Al removal into 2000mL 2M hydrochloric acid for reaction and stir f...

Example Embodiment

[0054] Example 3:

[0055] S1 discharges the used lithium-ion battery with a charge-discharger for about 4 hours (multiple discharges to ensure that the battery voltage is less than 1V), and then automatically disassembles and separates the positive and negative mixed powder through physical methods such as crushing, magnetic separation, and screening , Battery case, copper foil, aluminum foil and diaphragm, the battery case, copper foil, aluminum foil and diaphragm are directly recycled after disassembly;

[0056] S2 Add 100g of the separated positive and negative electrode mixed powder to 1000mL 2M NaOH solution at a temperature of 45℃, and stir for 1 hour at a stirring rate of 500 rpm in a mixer to fully dissolve the positive and negative electrode mixed powder. Recover Al element from the filtrate;

[0057] S3 Put the mixed powder of positive and negative electrodes filtered out in step S2 after Al removal at 90℃ into 800mL 1M hydrochloric acid to react and stir for 1h, liquid-s...

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Abstract

The invention provides an in-situ regeneration method of a waste lithium iron phosphate battery positive electrode material. The in-situ regeneration method comprises the following steps: disassembling and separating out positive and negative electrode mixed powder, a battery shell, a copper foil, an aluminum foil and a diaphragm by a physical method after discharging the waste lithium ion battery; adding the positive and negative electrode mixed powder into a NaOH solution for dissolution and removing the residual Al element and then placing the mixture in a hydrochloric acid solution with acertain concentration to leach Li, Fe and PO431 , filtering and removing insoluble graphite to enable the positive electrode material to be separated from the negative electrode graphite material andrecovering and regenerating the negative electrode material after purification; then adding a lithium source, an iron source or a phosphorus source according to the determined element ratio of leaching solution to make the molar ratio of Li: Fe: PO43- to be 1-1.05: 1: 1 and adding a certain amount of carbon source; and obtaining the lithium iron phosphate coated with carbon after spray pyrolysis.The disassembling mode is simplified, the lithium iron phosphate positive electrode material can be synthesized in situ, the hydrochloric acid can be recycled, the disassembling cost of the waste battery can be reduced and industrial production can be realized.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium iron phosphate batteries, in particular to an in-situ regeneration method for positive electrode materials of waste lithium iron phosphate batteries. Background technique [0002] With the advancement of new energy product technology, especially the demand for lithium-ion batteries in the electronic market and electric vehicle market is increasing year by year. As of the end of 2017, my country has promoted more than 1.8 million new energy vehicles and assembled about 86.9GWh of power batteries. Since 2018, lithium-ion batteries will gradually enter a large-scale decommissioning period, and there are a large number of lithium-ion battery disposal problems. However, waste lithium iron phosphate lithium-ion batteries contain reusable resources, such as lithium, aluminum, copper, iron and other valuable metals and graphite and other materials. If these batteries are not handled proper...

Claims

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Application Information

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IPC IPC(8): H01M10/54C01B25/45C01B32/215
CPCC01B25/45C01B32/215H01M10/54Y02W30/84
Inventor 陈建军叶利强田勇傅婷婷闵杰符冬菊张维丽张莲茜
Owner SHENZHEN QINGYAN EQUIP TECH CO LTD
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