Comprehensive recycling method for lithium iron phosphate cathode material

A technology of lithium ferrous phosphate and cathode material, applied in recycling technology, phosphorus compounds, battery recycling, etc., can solve the problems of difficulty in ensuring product consistency, inability to meet lithium ferrous phosphate, etc., and solve the problem of resource recycling and utilization , low cost effect

Active Publication Date: 2013-02-06
天齐锂业(江苏)有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the great variation in the quality of raw materials, it is difficult to guarantee the consistency of the product, which cannot meet the needs of industrialized large-scale production and recovery of lithium iron phosphate

Method used

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  • Comprehensive recycling method for lithium iron phosphate cathode material
  • Comprehensive recycling method for lithium iron phosphate cathode material
  • Comprehensive recycling method for lithium iron phosphate cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Embodiment 1 adopts the method of the present invention to comprehensively recycle and utilize lithium iron phosphate cathode material

[0053] Discharge the residual power of the waste lithium ferrous phosphate power battery, disassemble the battery, take out the positive electrode sheet, and recycle the battery shell according to the classification of aluminum shell, steel shell, plastic, etc.; roast the lithium iron phosphate positive electrode sheet at 400°C for 1 hour, crush it and sieve it Recycling positive electrode aluminum flakes; Obtain 100kg of lithium ferrous phosphate waste, lithium content 3.53%.

[0054] Roast lithium iron phosphate waste at 800°C for 1 hour, then add water to adjust the slurry, add 98% concentrated sulfuric acid to adjust the pH value to 0.5, filter to obtain a mixed solution of ferric phosphate, lithium phosphate, and ferric sulfate; heat the mixed solution to 80°C, add Alkali adjusted the pH value to 2.0, reacted for 4 hours, filtered...

Embodiment 2

[0060] Embodiment 2 adopts the method of the present invention to comprehensively recycle and utilize lithium iron phosphate cathode material

[0061] Get 100kg of lithium ferrous phosphate waste produced in the battery production process, with a lithium content of 3.51%. Roast lithium iron phosphate waste at 600°C for 2 hours, then add water to adjust the slurry, add 98% concentrated sulfuric acid to adjust the pH value to 0.8, filter to obtain a mixed solution of ferric phosphate, lithium phosphate, and ferric sulfate; heat the mixed solution to 90°C, add Alkali adjusted the pH value to 2.3, reacted for 2 hours, filtered to obtain crude iron phosphate, then washed with water at 60°C, and dried to obtain iron phosphate; the filtrate was adjusted to a pH value of 5, and then filtered to remove impurities; after removal of impurities, the filtrate was adjusted to a pH value of 11, React for 1 hour, filter to obtain crude lithium phosphate, wash with water at 60°C, and dry to ob...

Embodiment 3

[0067] Embodiment 3 adopts the method of the present invention to comprehensively recycle and utilize lithium ferrous phosphate cathode material

[0068] Get 100kg of lithium iron phosphate waste produced in the production process of lithium iron phosphate, and the lithium content is 4.39%. Roast lithium iron phosphate waste at 500°C for 4 hours, then add water to adjust the slurry, add 98% concentrated sulfuric acid to adjust the pH value to 1, filter to obtain a mixed solution of ferric phosphate, lithium phosphate, and ferric sulfate; heat the mixed solution to 100°C, add Alkali adjusted the pH value to 2.5, reacted for 1 hour, filtered to obtain crude iron phosphate, then washed with water at 80°C, and dried to obtain iron phosphate; the filtrate was adjusted to a pH value of 7, and then filtered to remove impurities; after removal of impurities, the filtrate was adjusted to a pH value of 10, React for 2 hours, filter to obtain crude lithium phosphate, wash with water at 1...

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Abstract

The invention relates to a comprehensive recycling method for a lithium iron phosphate cathode material, belonging to the technical field of recycle of waste lithium ion batteries. The invention aims to provide the comprehensive recycling method for the lithium iron phosphate cathode material, comprising the following steps of: a, roasting the lithium iron phosphate cathode material at the temperature of 500-800 DEG C for 1-4h; b, adding sulfuric acid into a roasted material to leach, controlling the pH value between 0.5 and 1 during leaching, and filtering to obtain a mixed solution of lithium phosphate, ferric phosphate and ferric sulfate; c, heating the mixed solution obtained in the step b to 80-100 DEG C, adjusting the pH value of the mixed solution to 2-2.5, reacting for 1-4h, filtering, cleaning and drying to obtain the ferric phosphate; and d, adjusting the pH value of a filtrate obtained through filtering in the step c to 10-12, reacting for 0.5-2h, filtering, cleaning and drying to obtain the lithium phosphate.

Description

technical field [0001] The invention relates to a comprehensive recycling method for lithium ferrous phosphate cathode materials, and belongs to the technical field of recycling waste lithium ion batteries. Background technique [0002] Lithium-ion battery is a green battery with a series of excellent properties. It has been widely used since it came out more than 10 years ago. Lithium iron phosphate (LiFePO 4 ) materials have become the preferred material for lithium-ion power batteries because of their high safety, high environmental protection, low price, and long life. Electric bicycles, mopeds, golf carts, airplane model toys, miner's lamps and other power battery fields. Car manufacturers are also repeatedly experimenting with lithium iron phosphate materials in starting power lithium-ion batteries (12V / 24V 50Ah). In the future, this material also has room for development in the fields of mobile communication base stations and energy storage equipment. [0003] Wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01B25/30H01M10/54
CPCY02E60/12Y02W30/84
Inventor 王平熊仁利黄春莲金鹏高宜宝
Owner 天齐锂业(江苏)有限公司
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