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A method for non-destructive recycling of waste lithium iron phosphate battery electrode materials

A lithium iron phosphate battery and lithium iron phosphate technology, applied in the field of comprehensive utilization of resources, can solve problems such as environmental and human hazards, difficulty in purification of electrode materials, difficulty in separating graphite from positive electrode materials, etc.

Active Publication Date: 2021-02-26
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main dismantling method of lithium batteries is mechanical crushing, such as CN 105811040 A, a lithium battery crushing, dismantling and recycling method, which is easy to operate, but the electrode materials and copper and aluminum foils are simultaneously crushed during the crushing process, and the recovered electrode materials contain A large amount of metal impurities makes it difficult to purify back-end electrode materials, and it is difficult to separate graphite from positive electrode materials, and it is difficult to recycle graphite
And CN106129513 A a kind of recycling method of waste lithium battery realizes the separation of positive electrode material and aluminum foil by the mode that organic solvent dissolves binder, this method can effectively avoid the introduction of metal impurity in positive electrode material, but the organic solvent that this method uses It is harmful to the environment and the human body, and the salt solute in the electrolyte cannot be recovered, such as lithium hexafluorophosphate, etc.

Method used

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  • A method for non-destructive recycling of waste lithium iron phosphate battery electrode materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] After cutting the lithium iron phosphate battery cell, add it to hot water at a temperature of 60°C. After 10 minutes, 98% of the graphite will fall off from the copper foil, and an electrolyte solution (solution A) will be obtained. Use a pore size of 1.5 After the sieve of cm is screened in water or the material is dried and sieved, the oversize and undersize are obtained. Obtain the graphite product after drying, and the sieve material is added into the stripping solution with a concentration of 0.1mol / L. After 1 hour, more than 98% of the lithium iron phosphate falls off from the aluminum foil, and the leaching rate of the phosphate radical is 14%. Obtain the phosphate solution (solution B), use the sieve of aperture 1.5cm to sieve in water or after the material is dried and sieved, obtain the oversieve and the undersieve, the undersieve is lithium iron phosphate, sulfur and lithium phosphate The mixture, the oversize is copper foil, aluminum foil, diaphragm and sin...

Embodiment 2

[0020] After cutting the lithium iron phosphate battery cell, add it to hot water at a temperature of 40°C. After 30 minutes, 98% of the graphite will fall off from the copper foil, and an electrolyte solution (solution A) will be obtained. Use a pore size of 1.5 After the sieve of cm is screened in water or the material is dried and sieved, the oversize and undersize are obtained. Obtain the graphite product after drying, and the concentration of the sieve is added to the stripping solution of 0.07mol / L. After 1.5 hours, 98% of the lithium iron phosphate falls off from the aluminum foil, and the leaching rate of the phosphate radical is 10%, and the obtained Phosphate solution (solution B), after sieving in water with a sieve with a pore size of 1.5cm or drying and sieving the material, the oversize and undersize are obtained, and the undersize is a mixture of lithium iron phosphate and lithium phosphate. The upper material is copper foil, aluminum foil, diaphragm and single ...

Embodiment 3

[0022] After cutting the lithium iron phosphate battery cell, add it to hot water at a temperature of 50°C. After 20 minutes, 98% of the graphite will fall off from the copper foil, and an electrolyte solution (solution A) will be obtained. Use a pore size of 1.5 After the sieve of cm is screened in water or the material is dried and sieved, the oversize and undersize are obtained. Obtain the graphite product after drying, and the sieve material is added into the stripping solution with a concentration of 0.15mol / L. After 1 hour, 99% of the lithium iron phosphate falls off from the aluminum foil, and the leaching rate of the phosphate radical is 20%, and the obtained Phosphate solution (solution B), after sieving in water with a sieve with a pore size of 0.3cm or drying and sieving the material, the oversize and undersize are obtained. The undersize is a mixture of lithium iron phosphate and lithium phosphate. The upper material is copper foil, aluminum foil, diaphragm and sin...

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Abstract

The invention relates to a method for nondestructively recycling waste lithium iron phosphate battery electrode materials, which belongs to the technical field of waste resource recycling and comprehensive utilization, and mainly includes the following steps: battery disassembly, graphite separation, lithium iron phosphate stripping, electrolyte recovery and copper aluminum separate. Through the dissolution of the negative electrode binder, the reaction of lithium iron phosphate and the stripping solution, the step-by-step stripping of the negative electrode material and the positive electrode material is realized, and at the same time, the electrolyte is recovered through the reaction of the reaction product of the chemical reaction in the stripping process and the lithium salt in the electrolyte. In the process, copper foil, aluminum foil, lithium iron phosphate, graphite and diaphragm materials can be recycled without damage.

Description

technical field [0001] The invention relates to a recycling method of electronic waste, in particular to a method for recycling waste lithium iron phosphate battery electrode materials, which belongs to the new technology of recycling solid waste in the field of comprehensive utilization of resources. Background technique [0002] With the popularity of electric vehicles, the number of power lithium batteries continues to increase. However, after 3-7 years of use, lithium batteries will be scrapped. In recent years, a large number of power lithium batteries have entered the scrapping period. At present, the main types of power batteries are lithium iron phosphate batteries and ternary batteries, which account for about 95% of the power battery market. Among them, lithium iron phosphate battery has the characteristics of environmental protection, safety and low cost. In 2015, 2016 and 2018, its market share was as high as 70%, 45% and 39%, respectively. It is one of the main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M10/54Y02W30/84
Inventor 张付申贺凯
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI