A regeneration method of a positive electrode sheet of a waste lithium iron phosphate battery

A technology for lithium iron phosphate and waste batteries, which is applied in the field of regeneration of cathode sheets of lithium iron phosphate waste batteries, can solve the problems of low iron element value, time-consuming and laborious, low economic value of lithium carbonate, etc. low cost effect

Inactive Publication Date: 2018-12-28
泉州市锂灿新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low value of iron element, the traditional chemical extraction process is time-consuming and laborious, and the economic value of simple extraction of lithium carbonate is not high

Method used

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  • A regeneration method of a positive electrode sheet of a waste lithium iron phosphate battery
  • A regeneration method of a positive electrode sheet of a waste lithium iron phosphate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for regenerating a lithium iron phosphate waste battery positive plate, comprising the following steps:

[0038] (1) Weigh 100g of the positive electrode sheet of the waste lithium iron phosphate battery, first cut it into small pieces of 1-2cm, then crush it with a universal pulverizer, and pass through a 200-mesh sieve to obtain the coarse powder of the waste lithium iron phosphate battery;

[0039] (2) Slowly add 70g of lithium iron phosphate waste battery coarse powder to 500ml of sodium hydroxide solution with a mass fraction of 15%. The reaction process releases a large number of bubbles. The reaction time is 1 hour. After the reaction is completed, the solution is filtered and dried. Obtain aluminum-removing powder of lithium iron phosphate waste battery;

[0040] (3) Take 60g of lithium iron phosphate waste battery to remove aluminum powder, the iron content is 34.8%, the phosphorus content is 19.5%, and the lithium content is 4.35% through chemical con...

Embodiment 2

[0045] A method for regenerating a lithium iron phosphate waste battery positive plate, comprising the following steps:

[0046](1) Weigh 100g of the positive electrode sheet of the waste lithium iron phosphate battery, first cut it into small pieces of 1-2cm, then crush it with a universal pulverizer, and pass through a 200-mesh sieve to obtain the coarse powder of the waste lithium iron phosphate battery;

[0047] (2) Slowly add 70g of lithium iron phosphate waste battery coarse powder to 500ml of sodium hydroxide solution with a mass fraction of 3%. The reaction process releases a large number of bubbles. The reaction time is 3 hours. After the reaction is completed, the solution is filtered and dried. Obtain aluminum-removing powder of lithium iron phosphate waste battery;

[0048] (3) Take 60g of lithium iron phosphate waste battery to remove aluminum powder, the iron content is 34.8%, the phosphorus content is 19.5%, and the lithium content is 4.35% through chemical cont...

Embodiment 3

[0052] A method for regenerating a lithium iron phosphate waste battery positive plate, comprising the following steps:

[0053] (1) Weigh 100g of the positive electrode sheet of the waste lithium iron phosphate battery, first cut it into small pieces of 1-2cm, then crush it with a universal pulverizer, and pass through a 200-mesh sieve to obtain the coarse powder of the waste lithium iron phosphate battery;

[0054] (2) Slowly add 70g of lithium iron phosphate waste battery coarse powder to 500ml of sodium hydroxide solution with a mass fraction of 20%. The reaction process releases a large number of bubbles. The reaction time is 0.5 hours. After the reaction is completed, the solution is filtered and dried. Obtain aluminum-removing powder of lithium iron phosphate waste battery;

[0055] (3) Take 60g of lithium iron phosphate waste battery to remove aluminum powder, the iron content is 34.8%, the phosphorus content is 19.5%, and the lithium content is 4.35% through chemical ...

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Abstract

The invention discloses a regeneration method of a positive electrode sheet of a waste lithium iron phosphate battery, which takes the positive electrode sheet of the waste lithium iron phosphate battery as a main raw material and purifies the raw material of the waste battery by means of physical comminution, sieving, alkalinization, dealumination, high-temperature repair and the like to preparea lithium iron phosphate composite material. The lithium iron phosphate composite material prepared by the method has the advantages of high compaction density, high capacity and low cost, the production cost is reduced by more than 40% compared with the conventional production process, the performance-price ratio of the lithium iron phosphate battery is improved, and the process is controllable,environmentally friendly and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of battery material preparation, and in particular relates to a method for regenerating positive plates of lithium iron phosphate waste batteries. Background technique [0002] my country's new energy automobile industry has entered a period of rapid development. According to GGII data, the sales of new energy vehicles in my country have increased significantly since 2012, from 12,000 to 780,000 in 2017; The output value accounted for 54%, surpassing the scale of digital lithium batteries, and becoming the largest area in the lithium battery consumption structure. According to the plan, the cumulative production and sales of new energy vehicles in my country will reach 5 million in 2020, and my country's power battery market will continue to maintain a high-speed development trend in the medium and long term. [0003] The service life of lithium batteries is limited. For traditional digital lithium batteries, the ser...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 刘东平蒋华锋鲍晓军
Owner 泉州市锂灿新材料科技有限公司
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