Green recycling method of waste lithium iron phosphate battery positive electrode

A lithium iron phosphate battery, recycling and processing technology, applied in battery recycling, battery electrodes, recycling of waste collectors, etc., can solve the problems of sodium hydroxide recycling aids such as alkalinity and strong corrosion, and achieve low cost and easy recycling Effects, easy-to-operate effects

Active Publication Date: 2020-09-11
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sodium hydroxide recovery aid used in this method is highly alkaline and corrosive

Method used

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  • Green recycling method of waste lithium iron phosphate battery positive electrode
  • Green recycling method of waste lithium iron phosphate battery positive electrode
  • Green recycling method of waste lithium iron phosphate battery positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Weigh 10g LiFePO 4 The powder is stirred and mixed with the sodium carbonate solid according to the ratio of 1:2, and placed in a ball mill for 5 minutes to make it fully mixed;

[0028] (2) Heating the material in step (2) to 700°C for solid phase sintering, the reaction time is 4h, and naturally cooling to room temperature after the reaction;

[0029] (3) For the sintered material in step (2), the slurry is made according to the liquid-solid ratio of 4:1, and 2 g of the sintered product is weighed, and deionized water is slowly added to the container containing the sintered product, and the water is continuously stirred during the water addition process. Continue stirring for 30 min after all the addition is complete, and obtain Li respectively after the filtration is completed. x Fe y o 2 filter cake and sodium phosphate solution;

[0030] (4) the filter cake obtained in step (3) is washed to obtain Li x Fe y o 2 ;

[0031] (5) step (3) filtrate is evapor...

Embodiment 2

[0033] The difference is that LiFePO 4 with Na 2 CO 3 The molar ratio of substances is 1:1.5, and the rest are the same as in Example 1.

[0034] figure 1 It is a flow chart of the green recycling process of the positive electrode of the waste lithium iron phosphate battery.

[0035] figure 2 For LiFePO in Example 1 4 with Na 2 CO 3 The TG-DTA curve of the mixture; in the process of 300~540℃, Na 2 CO 3 start to decompose to produce CO 2 , the mass loss is obvious, accompanied by LiFePO 4 The breaking of the internal Fe-P bond and the Na 3 PO 4 The formation of chemical bonds; 540 ~ 700 ° C process, it may be that ferrous iron absorbs oxygen in the air and is oxidized to lithium iron (Ⅲ) oxide (LiFeO 2 ) process; 700 ~ 1000 ℃ exothermic process, LiFeO 2 The process of crystal phase transformation; through the above analysis, it is determined that the sintering temperature is 700 ° C, and holding it for a certain period of time is beneficial to LiFeO 2 Formation ...

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Abstract

The invention belongs to the technical field of waste power lithium ion battery recovery, and particularly relates to a green recovery treatment method for a positive electrode of a waste lithium ironphosphate battery. According to the method, sodium carbonate is used as a recovery aid to recover the waste lithium iron phosphate, and the resourceful treatment of the positive electrode of the waste lithium iron phosphate battery is realized through a series of process routes such as ball-milling mixing, solid-phase sintering, pulping and filtering, evaporative crystallization and the like. Themethod is characterized in that the recovery of all elements of the positive electrode of the waste lithium iron phosphate battery can be realized, the recovered products are LixFeyO2 (x is more thanor equal to 0.5 and less than or equal to 1, y is more than or equal to 1 and less than or equal to 2.5, x:y is more than or equal to 0.2 and less than or equal to 1) and Na3PO4.12H2O. The treatmentmethod has the advantages of simple operation, low cost and easy industrialization.

Description

technical field [0001] The invention belongs to the technical field of recycling waste power lithium-ion batteries, and specifically relates to a green recycling method for the positive electrode of waste lithium iron phosphate batteries. Background technique [0002] Lithium iron phosphate batteries are widely used in various electric vehicles because of their high safety performance, long life, good high temperature performance, large capacity, no memory effect, light weight and environmental friendliness. Since 2014, the installed capacity of lithium iron phosphate batteries in electric vehicle batteries has continued to grow. The decommissioned power lithium iron phosphate battery is used in cascades, and then scrapped and recycled. In the near future, if a large number of discarded waste lithium iron phosphate battery cathodes are not effectively treated, it will occupy site resources and cause large-scale waste of lithium resources. People urgently need to find an eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C01G49/00H01M10/54H01M10/0525H01M4/58
CPCC01B25/308C01G49/0027H01M10/54H01M10/0525H01M4/5825H01M2220/20H01M2004/028Y02E60/10Y02W30/84
Inventor 贾普琦陈博高锐
Owner LANZHOU UNIVERSITY
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