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Method for recycling positive material of waste lithium iron phosphate battery

A technology for lithium iron phosphate batteries and cathode materials, which is applied to the field of recycling and utilization of waste lithium iron phosphate power batteries, can solve the problems of complex processes, difficulty in obtaining lithium iron phosphate materials, and difficulty in meeting large-scale industrial production, and achieves recycling. Simple process, uniform particle distribution and less equipment investment

Inactive Publication Date: 2012-10-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned recycling technology is difficult to obtain pure lithium iron phosphate material, and the process is complicated, which is difficult to meet the industrial production in large quantities

Method used

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  • Method for recycling positive material of waste lithium iron phosphate battery
  • Method for recycling positive material of waste lithium iron phosphate battery
  • Method for recycling positive material of waste lithium iron phosphate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Place the used lithium iron phosphate battery on the CT-3008W-5V3A-T CT-3008W-5V3A-T Xinwei cycle test equipment and discharge it at a discharge rate of 1C (170mA / g) and a discharge voltage of 0.05V;

[0033] 2) Mechanically disassemble the discharged lithium iron phosphate battery in a fume hood, and screen out the positive plate;

[0034] 3) Ultrasonic peel off the positive electrode sheet in deionized water, the ultrasonic frequency is 50KHz, and the stirring speed is 300 rpm to make the lithium iron phosphate positive electrode material fall off, remove the aluminum foil and dry it in a drying oven at a drying temperature of 80°C;

[0035]4) Ball mill the dried lithium iron phosphate cathode material, the ball milling speed is 400 revolutions per minute, and the ball milling time is 6 hours. The element ratio determined by ICP is Li:Fe:P=1.2:1:1; then 2g iron phosphate Lithium cathode material needs to add 2.225g lithium hydroxide monohydrate, 8.379g iron phospha...

Embodiment 2

[0040] 1) Place the used lithium iron phosphate battery on the CT-3008W-5V3A-T CT-3008W-5V3A-T Xinwei cycle test equipment and discharge it at a discharge rate of 3C (510mA / g) and a discharge voltage of 0.1V;

[0041] 2) Mechanically disassemble the discharged lithium iron phosphate battery in a fume hood, and screen out the positive plate;

[0042] 3) Ultrasonic peel off the positive electrode sheet in deionized water, the ultrasonic frequency is 80KHz, and the stirring speed is 200 rpm to make the lithium iron phosphate positive electrode material fall off, remove the aluminum foil and dry it in a drying oven at a drying temperature of 100°C;

[0043] 4) Ball mill the dried lithium iron phosphate cathode material, the ball milling speed is 300 revolutions per minute, and the ball milling time is 8 hours. The element ratio determined by ICP is Li:Fe:P=1.2:1:1.1; then 2g iron phosphate Lithium cathode material needs to add 2.225g lithium hydroxide monohydrate, 8.190g iron phos...

Embodiment 3

[0048] 1) Put the used lithium iron phosphate battery on the CT-3008W-5V3A-T CT-3008W-5V3A-T Xinwei cycle test equipment and discharge it at a discharge rate of 5C (850mA / g) and a discharge voltage of 0.1V;

[0049] 2) Mechanically disassemble the discharged lithium iron phosphate battery in a fume hood, and screen out the positive plate;

[0050] 3) Ultrasonic peel off the positive electrode sheet in deionized water, the ultrasonic frequency is 100KHz, and the stirring speed is 80 rpm to make the lithium iron phosphate positive electrode material fall off, remove the aluminum foil and dry it in a drying oven at a drying temperature of 120°C;

[0051] 4) Ball mill the dried lithium iron phosphate positive electrode material, the ball milling speed is 200 revolutions per minute, the ball milling time is 8 hours, the element ratio determined by ICP is Li:Fe:P=1.2:1:1; then 2g iron phosphate 0.379g of lithium hydroxide monohydrate needs to be added to the lithium positive electro...

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Abstract

The invention discloses a simple and easy method for recycling positive material of a waste lithium iron phosphate battery, and the method can be used for the industrial production. The method comprises the following steps: firstly, carrying out total discharge (0.05V) on the waste lithium iron phosphate battery, then mechanically disassembling the battery in a fume hood and screening a positive plate; and placing the positive material into water to carry out ultrasonic stirring, sieving out an aluminium foil, drying the residual solution and material, carrying out ball milling, carrying out elemental analysis, matching the obtained material with a novel raw material and carrying out sintering to obtain the lithium iron phosphate positive material with superior performances. The method has the significance that according to the simple method for recycling the lithium iron phosphate positive material which can be used for the industrial production, the positive material with the superior performances can be obtained by utilizing additives in wastes, such as acetylene black and the like, without carrying out the pretreatment.

Description

technical field [0001] The invention relates to a method for recycling a positive electrode material of a waste lithium iron phosphate battery, in particular to a method for recycling a waste lithium iron phosphate power battery. Background technique [0002] With the continuous development of the electric vehicle industry, the demand for lithium iron phosphate batteries will increase, especially the development of lithium iron phosphate power batteries in China is more rapid. According to the announced development plan and market status of electric vehicles, there will be no less than 50,000 to 100,000 electric vehicles running in my country in 3-5 years, and most of the batteries will use lithium iron phosphate materials. Electric vehicles require hundreds of kilograms of lithium iron phosphate cathode materials on average. After a few years, thousands of tons of lithium iron phosphate batteries will be scrapped in my country every year. If they are not treated, they will c...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02E60/12Y02W30/84
Inventor 曹高劭朱允广赵新兵周斌谢健
Owner ZHEJIANG UNIV
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