Method for recycling lithium ferrous phosphate material from waste lithium ferrous phosphate battery positive plates

A lithium ferrous phosphate and battery cathode technology, which is applied in the field of recycling lithium ferrous phosphate materials from waste lithium ferrous phosphate battery cathode sheets, can solve the problem that the product consistency is difficult to guarantee, cannot meet the change of lithium ferrous phosphate, and the quality of raw materials Large and other problems, to achieve the effect of low cost, easy operation and simple steps

Active Publication Date: 2016-12-21
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
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AI Technical Summary

Problems solved by technology

This method does not produce secondary pollution, but it is difficult to remove impurities, which makes the quality of raw materials vary greatly, making it difficult to ensure product consistency, and cannot meet the needs of industrialized large-scale production and recovery of lithium iron phosphate

Method used

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  • Method for recycling lithium ferrous phosphate material from waste lithium ferrous phosphate battery positive plates

Examples

Experimental program
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Effect test

Embodiment 1

[0025] like figure 1 Shown, a kind of method that reclaims ferrous phosphate lithium material from waste lithium ferrous phosphate battery positive plate, comprises the steps:

[0026] 1. Pretreatment: roast the positive electrode sheet of the waste lithium ferrous phosphate battery at a temperature of 400°C for 4 hours, then pulverize it, sieve and recover the aluminum sheet of the positive electrode, and obtain the waste lithium iron phosphate slurry.

[0027] 2. Flotation: Treat the positive electrode waste slurry with deionized water, stir or ultrasonically oscillate at 100°C for 1 hour, remove the conductive agent by flotation, and obtain a mixture of lithium ferrous phosphate and binder.

[0028] 3. Extraction: Add the mixture of lithium ferrous phosphate and binder obtained above into the mixed solution of N-methylpyrrolidone and hydrochloric acid, and mix the mixture of lithium iron phosphate and binder with N-methylpyrrolidone and hydrochloric acid The mass ratio of ...

Embodiment 2

[0034] 1. Pretreatment: roast the positive electrode sheet of the waste lithium ferrous phosphate battery at a temperature of 300°C for 4 hours, then pulverize it, sieve and recover the aluminum sheet of the positive electrode, and obtain the waste lithium iron phosphate slurry.

[0035] 2. Flotation: Treat the positive electrode waste slurry with deionized water, stir or ultrasonically oscillate at 20°C for 3 hours, remove the conductive agent by flotation, and obtain a mixture of lithium ferrous phosphate and binder.

[0036] 3. Extraction: the mixture of lithium ferrous phosphate and binder obtained in step 1 is added to the mixed solution of N-methylpyrrolidone and hydrochloric acid, the mixture of lithium iron phosphate and binder is mixed with N-methylpyrrolidone and The mass ratio of the hydrochloric acid mixture is 10:7, the volume ratio of N-methylpyrrolidone to hydrochloric acid is 1:1, stirred or ultrasonically oscillated for 3 hours at room temperature, and rested f...

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Abstract

The invention discloses a method for recycling a lithium ferrous phosphate material from waste lithium ferrous phosphate battery positive plates, wherein the method comprises the following steps: roasting the waste lithium ferrous phosphate battery positive plates, crushing, sieving and recycling positive electrode aluminum sheets to obtain a lithium ferrous phosphate waste slurry; soaking the lithium ferrous phosphate waste slurry in deionized water, and floating to remove a conductive agent, to obtain a mixture of lithium ferrous phosphate and a binder; adding the mixture to a mixed solution of N-methylpyrrolidone and hydrochloric acid, and extracting the binder, to obtain a lithium ferrous phosphate crude product; heating to remove N-methylpyrrolidon NMP and hydrochloric acid; and filtering, washing and drying to obtain lithium ferrous phosphate. The conductive agent and the binder are gradually removed or separated, so as to obtain the lithium ferrous phosphate crude product; the method is simple in steps, easy to operate and low in cost, avoids the problem of energy consumption of high temperature roasting, also avoids the problem that acid soluble precipitated impurities are difficult to remove cleanly, and is conducive to industrialization realization.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium ion batteries, and relates to a method for recycling lithium iron phosphate materials from positive plates of waste lithium iron phosphate batteries. Background technique [0002] Lithium-ion batteries are green batteries with a series of excellent properties, and have been widely used since their inception. Due to the advantages of high safety, high environmental protection, high specific energy, low price, and long life, lithium iron phosphate material has become the first choice material for lithium-ion power batteries, and lithium-ion batteries with lithium iron phosphate as the positive electrode material are now It has been widely used in power battery fields such as electric tools, electric bicycles, mopeds, golf prison cars, airplane model toys, and miner's lamps. With the application of lithium-ion secondary batteries using lithium iron phosphate as the positive electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M10/54
CPCY02W30/84C01B25/45H01M10/54
Inventor 吴风霞
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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