Recycling method of waste lithium iron phosphate positive electrode powder

A lithium iron phosphate and positive electrode technology, which is applied in the field of recycling waste lithium iron phosphate positive electrode powder, can solve problems that restrict the popularization and application of lithium iron phosphate batteries, battery capacity attenuation, and cannot be used normally, so as to solve the difficulty of tailings disposal , the content of impurities is reduced, and the product appearance is good

Active Publication Date: 2021-05-18
JIUJIANG TINCI ADVANCED MATERIALS CO LTD +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Although the cycle life of lithium iron phosphate batteries is long, the battery capacity will be greatly attenuated after 5 to 8 years of normal use, so that it cannot be used normally and is scrapped.
Limited to the recycling technology of existing battery materials, the current recycling companies only recycle about 4% of the main content of lithium. However, the main components of iron and phosphorus in the positive electrode powder of lithium iron phosphate batteries cannot be recycled due to the high content of aluminum impurities. This will not only increase the environmental burden, but also restrict the popularization and application of lithium iron phosphate batteries

Method used

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  • Recycling method of waste lithium iron phosphate positive electrode powder
  • Recycling method of waste lithium iron phosphate positive electrode powder

Examples

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Effect test

Embodiment 1

[0073]Method for recycling the recovery method of waste phosphate lithium positive electrode powder, including the following steps:

[0074](1) Weigh 100g waste phosphate cell positive powder in the reaction kettle, add 200 ml of distilled water to 0.053 g (0.02 mol) concentrated hydrochloric acid, 11g (0.05 mol) Hedp, stirred at 20R / min, constantly stirring The temperature was warmed to 80 ° C, the reaction was 2 h, and the lithium iron phosphate containing <100 ppm was filtered. 100 g of a tubic iron phosphate battery positive electrode powder and a substance of lithium iron phosphate content of 100 ppm of 100 ppm is about 0.54 mol.

[0075](2) In the reaction kettle, 200 ml of distilled water, 55 g (0.55 mol) concentrated hydrochloric acid was added, and the lithium iron phosphate was pulp, the stirring speed was 20 r / min, and 47 g (0.38 mol) dioxygen (content: 27.5%), control The reaction temperature was <70 ° C. The oxidation is completely oxidized with an adjacent phytoprine, an...

Embodiment 2

[0082]Method for recycling the recovery method of waste phosphate lithium positive electrode powder, including the following steps:

[0083](1) Weigh 100g used phosphate positive electrode powder in the reactor, add 200 ml of distilled water, add 0.5 g (0.005 mol) concentrated sulfuric acid, 15.7 g (0.053 mol) EDTA, stirring speed of 20R / min, constantly agitation The lower temperature was 80 ° C, the reaction was 3 h, and the lithium iron phosphate containing <100 ppm was filtered. 100 g of a tubic iron phosphate battery positive electrode powder and a substance of lithium iron phosphate content of 100 ppm of 100 ppm is about 0.54 mol.

[0084](2) In the reactor, 200 ml of distilled water, 27 g (0.27 mol) concentrated sulfuric acid was added, and the lithium iron phosphate was pulp and the stirring velocity was 20 R / min, and 47 g (0.38 mol) dioxygen (content: 27.5%), control The reaction temperature was <70 ° C. The oxidation is completely oxidized with an adjacent phytoprine, and the...

Embodiment 3

[0091]Method for recycling the recovery method of waste phosphate lithium positive electrode powder, including the following steps:

[0092](1) Weigh 3000 g of waste phosphithium phosphate positive electrode powder in the reaction kettle, add 60 g of concentrated sulfuric acid, 300 g of EDTA, stirred at a stirring speed of 20 r / min, and stir up to 90 ° C, reaction for 3 h, filtrate Lithium lithium iron phosphate containing <100 ppm was obtained. 100 g of a tubic iron phosphate battery positive electrode powder and a substance of lithium iron phosphate content of 100 ppm of 100 ppm is about 0.54 mol.

[0093](2) 6000 ml of distilled water, 810 g of concentrated sulfuric acid was added, and the lithium iron phosphate was pulp and the stirring velocity was 20 R / min, and 1410 g of dual oxygen (content: 27.5%) was added dropwise, and the reaction temperature was <70 ° C. The oxidation is completely oxidized with an adjacent phytoprine, and the reaction is 1 h, which is a lithium sulfate so...

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Abstract

The invention relates to a recycling method of waste lithium iron phosphate positive electrode powder. The recycling method comprises the following steps: S1, mixing the lithium iron phosphate positive electrode powder with a first inorganic acid, a metal complexing agent and water for aluminum removal treatment, and conducting filtering to obtain an aluminum-removed lithium iron phosphate material; S2, subjecting the aluminum-removed lithium iron phosphate material and a second inorganic acid to mixing and pulping, adding hydrogen peroxide for an oxidation reaction, and conducting filtering to obtain iron-containing phosphorus filter residues; S3, subjecting the iron-phosphorus-containing filter residues and a third inorganic acid to mixing, pulping and dissolving, and conducting filtering to remove graphite so as to obtain an iron-phosphorus-containing filtrate; and S4, adjusting the pH value of the iron-containing phosphorus filtrate by adopting alkali, conducting reacting, separating out a precipitate, carrying out filtering, and taking filter residues so as to obtain iron phosphate. According to the recycling method, the waste lithium iron phosphate positive electrode powder can be used as a raw material to prepare iron phosphate with relatively high purity and relatively few impurities, and the yield of the method is high.

Description

Technical field[0001]The present invention relates to the field of battery technology, and more particularly to recovery methods of waste phosphate positive electrode powder.Background technique[0002]Lithium iron phosphate batteries due to its high operating voltage, large energy density, long cycle life, good safety performance, self-discharge rate, and no memory effect, its market share increases year by year. In the next 10 years, the lithium iron phosphate battery will substituted a nickel-watery-based ternary battery (NMC) battery as a major fixed electrical energy storage tool. Although the cycle of lithium iron phosphate batteries is long, the battery capacity will appear larger attenuation after 5 to 8 years, so that it cannot be used normally. Limited to the recycling technology of existing battery materials, the current recycling enterprises only recover lithium accounting for about 4% of the main content, however, the primary components of the lithium iron phosphate catho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37C01D15/08H01M10/54
CPCC01B25/375C01D15/08H01M10/54C01P2006/80Y02W30/84
Inventor 程光生李安国刘雅婷陈传林江文波韩恒
Owner JIUJIANG TINCI ADVANCED MATERIALS CO LTD
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