Method for recycling lithium iron phosphate positive electrode material

A technology of lithium iron phosphate and cathode material, applied in the field of electrochemistry, can solve the problems of resource waste, environmental pollution, etc., and achieve the effects of saving recovery costs, simple recovery methods, and good overall performance

Active Publication Date: 2019-05-07
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If these batteries are not properly disposed of, it will not only cause serious pollution to the environment, but also a waste of resources

Method used

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  • Method for recycling lithium iron phosphate positive electrode material
  • Method for recycling lithium iron phosphate positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step a) Disassemble a 35Ah lithium iron phosphate hard-shell battery whose capacity has decayed to 80%, cut off the tabs, and put the winding core (~600g) and residual electrolyte (~20g) into 1.5L of hydrochloric acid with a concentration of 5M solution, then add 250ml 3M hydrogen peroxide solution, and stir and soak for 2h at 25°C.

[0050] Sieve the above mixture through a 100-mesh screen to remove insoluble impurities to obtain a suspension; filter the suspension under reduced pressure to obtain a recovered carbon source and the first liquid phase, the pH of the first liquid phase pH(a) = 0.6.

[0051] Step b) Add 5M ammonia solution dropwise to the above solution until pH(b)=2.0, and filter to generate the first precipitate (~230g) whose main component is iron phosphate and the first lithium-containing solution.

[0052] Step c) Continue to add 5M aqueous ammonia solution dropwise to the first lithium-containing solution until pH (c)=6.4, and obtain the second lith...

Embodiment 2

[0058] Step a) Disassemble a 35Ah lithium iron phosphate hard-shell battery whose capacity has decayed to 80%, cut off the tabs, and put the winding core (~600g) and residual electrolyte (~20g) into 1.5L of nitric acid with a concentration of 3M In the solution, stir and soak for 3 hours at 30°C.

[0059] The above-mentioned mixture is screened through a 100-mesh screen to remove insoluble impurities to obtain a suspension; the suspension is filtered under reduced pressure to obtain a recycled carbon source and the first liquid phase, and the pH value of the first liquid phase: pH (a ) = 0.8.

[0060] Step b) Add triethylamine dropwise to the above solution until pH (b)=1.5, filter to generate the first precipitate (~229g) whose main component is iron phosphate, the first lithium-containing solution.

[0061] Step c) Continue to add triethylamine solution dropwise to the first lithium-containing solution until pH (c)=5.0, and obtain the second lithium-containing solution afte...

Embodiment 3

[0067] Step a) Disassemble a 35Ah lithium iron phosphate hard-shell battery whose capacity has decayed to 80%, cut off the tabs, and put the winding core (~600g) and residual electrolyte (~20g) into 1.5L of 3M three Chloroacetic acid solution, then add 250ml 1M hydrogen peroxide solution, and stir and soak for 5h at 20°C.

[0068] Sieve the above mixture through a 100-mesh sieve to remove insoluble impurities to obtain a suspension; filter the suspension under reduced pressure to obtain a recovered carbon source and the first liquid phase. The pH of the first liquid phase is pH(a)=0.4.

[0069] Step b) Add triethylamine dropwise to the above solution until pH (b) = 1.0, and filter to generate the first precipitate (~220g) whose main component is iron phosphate, the first lithium-containing solution.

[0070] Step c) Continue to add triethylamine solution dropwise to the above solution until pH (c) = 7.0, and obtain the second lithium-containing solution after filtration.

[...

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Abstract

The present invention relates to the field of electrochemistry, and more particularly to a method for recycling a lithium iron phosphate positive electrode material. The method comprises the followingsteps: contacting a recycled cell material with an acid solution, and carrying out solid-liquid separation to obtain a first liquid phase and an insoluble substance; adjusting the pH value of the first liquid phase, and carrying out solid-liquid separation to obtain a first lithium-containing solution and a first precipitate; mixing the first precipitate, a second lithium-containing solution andan auxiliary agent to obtain a second liquid phase; adjusting the contents of Li element, Fe element, P element and C element in the second liquid phase to obtain a third liquid phase; removing the solvent of the third liquid phase to obtain a lithium iron phosphate precursor; and calcining the precursor in a reducing environment to obtain the lithium iron phosphate positive electrode material. The method for recycling the lithium iron phosphate positive electrode material provided by the present invention has the advantages of simple process, high recycling rate, low impurity content and thelike, and has a good industrialization prospect.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a method for recycling and preparing lithium iron phosphate cathode materials. Background technique [0002] With the government's strong support for new energy vehicles, the rapid development of my country's new energy vehicle industry leads the world. However, we must clearly see how to deal with more and more decommissioned power batteries. If these batteries are not properly disposed of, it will not only cause serious pollution to the environment, but also be a waste of resources. [0003] At present, researchers at home and abroad have done a lot of research on the pretreatment and recycling of lithium iron phosphate batteries, but the existing methods still have various defects. Therefore, it is of great significance to this field to develop a method for recycling waste lithium iron phosphate batteries that is simple, efficient, low in recycling cost, less in environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525H01M10/54
CPCC01B25/45H01M4/58H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 林永寿赵丰刚刘晓梅郑先锋王国宝王凡
Owner CONTEMPORARY AMPEREX TECH CO
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