Material recycling method of waste lithium iron phosphate battery

A lithium iron phosphate battery and material recycling technology, applied in battery recycling, recycling technology, waste collector recycling and other directions, can solve the problems of high energy consumption, poor environmental friendliness, low lithium iron phosphate recycling efficiency, etc., to achieve energy consumption Low, environmentally friendly, easy-to-operate effects

Inactive Publication Date: 2018-07-06
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a material recycling method for waste lithium iron phosphate batteries, aiming to solve the problem of low recycling efficiency of lithium iron phosphate and high energy consumption due to the material recycling method for waste lithium iron phosphate batteries provided by the prior art, which is harmful to the environment. Unfriendly technical issues

Method used

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  • Material recycling method of waste lithium iron phosphate battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) Select the used new energy electric vehicle lithium iron phosphate battery, discharge it on professional discharge equipment, disassemble the battery after discharge, collect the positive and negative electrodes and separators inside the battery independently, and obtain the positive electrode of the battery piece.

[0053] (2) Put the obtained positive electrode sheet into a muffle furnace, pass nitrogen gas into the muffle furnace, and calcinate at 400 ° C for 2 hours. After cooling, the temperature drops to room temperature, and cut the positive electrode sheet to a size of 3 × 3 cm , put the cut positive electrode sheet into the mechanical vibrating screen, the positive electrode sheet is violently vibrated on the screen surface by the force of the vibration source, and the lithium iron phosphate on the electrode sheet is peeled off from the aluminum foil by the vibration force, so that the lithium iron phosphate and The aluminum foil is separated and passed thr...

Embodiment 2

[0059] (1) Select the used new energy electric vehicle lithium iron phosphate battery, discharge it on professional discharge equipment, disassemble the battery after discharge, collect the positive and negative electrodes and separators inside the battery independently, and obtain the positive electrode of the battery piece.

[0060] (2) Put the obtained positive electrode sheet into a muffle furnace, pass nitrogen gas into the muffle furnace, and calcinate at 430° C. for 2-3 hours. After cooling, the temperature drops to room temperature, and cut the positive electrode sheet to 5×5 centimeter size, put the cut positive electrode into the mechanical vibrating sieve, the positive electrode vibrates violently on the screen surface by the force of the vibration source, and the lithium iron phosphate on the electrode is peeled off from the aluminum foil by the vibration force, so that the iron phosphate Lithium is separated from the aluminum foil and passed through the screen qui...

Embodiment 3

[0066] (1) Select the used new energy electric vehicle lithium iron phosphate battery, discharge it on professional discharge equipment, disassemble the battery after discharge, collect the positive and negative electrodes and separators inside the battery independently, and obtain the positive electrode of the battery piece.

[0067] (2) Put the obtained positive electrode sheet into a muffle furnace, pass nitrogen gas into the muffle furnace, and calcinate at 450° C. for 2-3 hours. After cooling, the temperature drops to room temperature, and cut the positive electrode sheet to 5×5 centimeter size, put the cut positive electrode into the mechanical vibrating sieve, the positive electrode vibrates violently on the screen surface by the force of the vibration source, and the lithium iron phosphate on the electrode is peeled off from the aluminum foil by the vibration force, so that the iron phosphate Lithium is separated from the aluminum foil and passed through the screen qui...

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Abstract

The invention provides a material recycling method of a waste lithium iron phosphate battery. A regenerative lithium iron phosphate material is obtained by taking a positive electrode aluminum foil sheet of the waste lithium iron phosphate battery as a raw material, performing mechanical oscillation on the positive electrode aluminum foil sheet of the waste lithium iron phosphate battery after calcination so that a positive electrode material of the positive aluminum foil sheet is separated from the aluminum foil sheet and removing redundant Li<+>, Fe<2+> and PO<4><3-> in the positive electrode material. The method is simple and easy to operate, is relatively low in energy consumption and is friendly to an environment, and no secondary pollutant is generated.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment and recycling of electrode materials, and in particular relates to a material recycling method for waste lithium iron phosphate batteries. Background technique [0002] LiFePO 4 Lithium battery as the positive electrode material has become the first choice of power battery due to its low cost, multi-element and environmental friendliness, so LiFePO 4 It is widely used in new-generation vehicles such as EV and HEV as the positive electrode material of power batteries. With LiFePO 4 The preparation technology of the increasingly mature, its commercial products are also increasing. Therefore, a large amount of waste LiFePO is produced every year 4 Batteries, if these batteries are not treated scientifically and effectively, it will inevitably cause certain pollution to the environment. Therefore, LiFePO 4 Battery recycling has become a matter of concern. [0003] Due to the existence...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 张哲鸣吴正斌杨芳
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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