A method for recovering and preparing a lithium-manganese-iron phosphate positive-electrode material covered with carbon from waste lithium iron phosphate batteries

A lithium iron phosphate battery and lithium manganese iron phosphate technology, which is applied in the field of comprehensive utilization of waste resources, can solve problems such as high cost, poor battery performance, and complicated processing, and achieve low cost, environmental friendliness, and high energy density.

Inactive Publication Date: 2018-11-30
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to recycle waste lithium iron phosphate batteries, most people use pyrometallurgical calcination regeneration and hydrometallurgy to recover valuable metals for positive electrode materials, but the regenerated positive electrode materials obtai

Method used

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  • A method for recovering and preparing a lithium-manganese-iron phosphate positive-electrode material covered with carbon from waste lithium iron phosphate batteries
  • A method for recovering and preparing a lithium-manganese-iron phosphate positive-electrode material covered with carbon from waste lithium iron phosphate batteries
  • A method for recovering and preparing a lithium-manganese-iron phosphate positive-electrode material covered with carbon from waste lithium iron phosphate batteries

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Embodiment 1

[0043] A method for reclaiming and preparing carbon-coated lithium manganese iron phosphate cathode materials from waste lithium iron phosphate batteries, comprising the following steps:

[0044] S11. After discharging the residual power of the waste lithium iron phosphate battery, disassemble the battery, separate the positive electrode sheet, wash and dry the positive electrode sheet;

[0045] S12. Calcining the dried positive electrode sheet in an oxygen atmosphere at 500° C. for 1 hour to carbonize the binder, and separating the calcined positive electrode mixture from the current collector aluminum foil to obtain lithium iron phosphate powder and Positive electrode mixture of conductive carbon;

[0046] S13. Dissolve the above positive electrode mixture with 98% concentrated sulfuric acid and filter to obtain the first filtrate with pH=0.4, add ammonia water to the first filtrate, stir while adding ammonia water until the pH reaches 1.0, continue stirring for a period of ...

Embodiment 2

[0052] A method for reclaiming and preparing carbon-coated lithium manganese iron phosphate cathode materials from waste lithium iron phosphate batteries, comprising the following steps:

[0053] S21. After discharging the residual power of the waste lithium iron phosphate battery, disassemble the battery, separate the positive electrode sheet, wash and dry the positive electrode sheet;

[0054] S22. Calcining the dried positive electrode sheet in an oxygen atmosphere at 900° C. for 4 hours to carbonize the binder, and separating the calcined positive electrode mixture from the current collector aluminum foil to obtain lithium iron phosphate powder and Positive electrode mixture of conductive carbon;

[0055] S23. Dissolve the above positive electrode mixture with 98% concentrated sulfuric acid and filter to obtain the first filtrate with pH = 0.8, add ammonia water to the first filtrate, stir while adding ammonia water until the pH reaches 1.5, continue stirring for a period ...

Embodiment 3

[0061] A method for reclaiming and preparing carbon-coated lithium manganese iron phosphate cathode materials from waste lithium iron phosphate batteries, comprising the following steps:

[0062] S31. After discharging the residual power of the waste lithium iron phosphate battery, disassemble the battery, separate the positive electrode sheet, wash and dry the positive electrode sheet;

[0063] S32. Calcining the dried positive electrode sheet in an oxygen atmosphere at 700° C. for 5 hours to carbonize the binder, and separating the calcined positive electrode mixture from the current collector aluminum foil to obtain lithium iron phosphate powder and Positive electrode mixture of conductive carbon;

[0064] S33. Dissolve the positive electrode mixture with 98% concentrated sulfuric acid and filter to obtain the first filtrate with pH=0.6, add ammonia water to the first filtrate, stir while adding ammonia water, until the pH reaches 1.9, continue stirring for a period of time...

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Abstract

The invention provides a method of recovery and reutilization of waste lithium iron phosphate batteries. The method includes (1) separating positive electrode material mixture from the waste lithium iron phosphate batteries; (2) fully dissolving the positive electrode material mixture with sulfuric acid, performing filtration to obtain a first filtrate, adding ammonia water into the filtrate understirring until the pH value of the system is 1.0-1.9, stirring the mixture, and performing filtration to obtain a second filtrate and iron phosphate precipitate; (3) adding barium hydroxide or bariumnitrate into the second filtrate and performing filtration to obtain a third filtrate; (4) adding the third filtrate, the iron phosphate precipitate, a manganese source, a phosphorus source and a carbon source according to the element ratio of a product to be prepared that is lithium-manganese-iron phosphate LiFe<1-x>Mn<x>PO4 to obtain a solution mixture; and (5) subjecting the solution mixture to ball milling, drying and crushing, pre-sintering a product at a first temperature in an inert atmosphere, and sintering the product at a second temperature to obtain the lithium-manganese-iron phosphate positive-electrode material covered with carbon. Through the method, all elements in the waste lithium iron phosphate batteries are recovered and reutilized.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of waste resources, in particular to a method for preparing carbon-coated lithium manganese iron phosphate cathode materials from waste lithium iron phosphate batteries. Background technique [0002] With the development of various electronic products and electric tools, people's demand for batteries is increasing day by day. Lithium-ion batteries have been widely used in civil and military fields due to their high specific energy, long cycle life, and good rate performance. At present, lithium-ion batteries using lithium iron phosphate as the positive electrode material are widely used as power batteries for electric vehicles and other power tools due to their relatively low cost and good safety performance. And more and more. Therefore, the effective recycling and reuse of waste lithium iron phosphate batteries has dual significance of economic value and social benefit. [0...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M4/36H01M4/58H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/366H01M4/5825H01M4/625H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 孔令涌黄少真
Owner SHENZHEN DYNANONIC
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