Method for preparing lithium iron phosphate cathode material by recycling waste lithium iron phosphate battery

A technology of lithium iron phosphate battery and lithium iron phosphate, which is applied in battery recycling, secondary battery, recycling technology, etc., can solve the problems of cumbersome and complicated process, high process cost, poor phase uniformity, etc., and achieve simplified process flow, Good separation effect and good material consistency

Active Publication Date: 2020-12-04
GUANGDONG GUANGHUA SCI TECH
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Problems solved by technology

[0005] In order to solve the existing problems such as cumbersome and complicated process for recycling lithium iron phosphate batteries, high process cost, and poor phase uniformity, the present invention provides a method for preparing lithium iron phosphate cathode materials by recycling waste lithium ion batteries, which aims to be simple, Effectively realize the regeneration of lithium iron phosphate

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  • Method for preparing lithium iron phosphate cathode material by recycling waste lithium iron phosphate battery

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Embodiment 1

[0028] Soak the used lithium iron phosphate battery in 15g / L NaCl solution and discharge for 10h. Manually disassemble and separate the positive and negative pole pieces and diaphragm. After the pole piece is crushed, it is frozen at -10°C for 60 minutes, soaked in boiling water for 30 minutes, and vibrating and sieved to separate the active material, copper foil, and aluminum foil, and the active material is vacuum roasted at 600°C for 4 hours. The roasted active material is leached with 4mol / L sulfuric acid, the ratio of the molar amount of iron powder added to the molar amount of iron in the raw material is 1:40, the leaching time is 0.5h, the liquid-solid ratio is 3:1, and the leaching temperature is 30°C. After the leaching is completed, the leachate is obtained by solid-liquid separation. Add NaOH to the leaching solution to adjust the pH to 1.0, add NaOH 2 S precipitates impurity copper, filters the copper slag after fully reacting, then adds an appropriate amount of ...

Embodiment 2

[0030] Soak the used lithium iron phosphate battery in 15g / L NaCl solution and discharge for 10h. Manually disassemble and separate the positive and negative pole pieces and separators. After the pole pieces are broken, they are frozen at -20°C for 30 minutes, soaked in boiling water for 20 minutes, and vibrated and sieved to separate the active material, copper foil, and aluminum foil. Vacuum roasting for 1h. The roasted active material is leached with 4mol / L hydrochloric acid, the ratio of the molar amount of ascorbic acid added to the molar amount of iron in the raw material is 1:20, the leaching time is 2h, the liquid-solid ratio is 6:1, the leaching temperature is 20°C, and the leaching is over Afterwards, the leachate was obtained by solid-liquid separation. Add ammonia water to the leaching solution to adjust the pH to 0.5, add (NH 4 ) 2 S precipitates impurity copper, filters the copper slag after fully reacting, then adds an appropriate amount of ammonia solution d...

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Abstract

The invention provides a method for preparing a lithium iron phosphate positive electrode material by recycling a waste lithium iron phosphate battery. The method comprises the steps of (1) immersingthe waste lithium iron phosphate battery in salt water and disassembling the battery after full discharge to obtain positive and negative pole pieces, (2) sorting and selecting an active substance, acopper foil and an aluminum foil after the positive and negative pole pieces are crushed, frozen, immersed in boiling water and sieved by vibration, (3) performing vacuum baking on the sorted active substance, (4) performing acid leaching on the active substance which is subjected to vacuum baking to obtain a solution containing Li, Fe, P and insoluble slag, (5) removing residual copper impuritiesand aluminum impurities in a leaching solution by modes of copper removal with vulcanization and aluminum removal with aluminum phosphate deposition, (6) adding a lithium source and a phosphorus source to the leaching solution to perform hydrothermal reaction to obtain a regenerated lithium iron phosphate material, and (7) mixing with a carbon source and performing high-temperature baking treatment to obtain a carbon-coated lithium iron phosphate positive electrode material. The process of the invention is short, the obtained regenerated lithium iron phosphate positive electrode material hasexcellent electrochemical performance, and valuable elements in the waste lithium iron phosphate battery are effectively utilized.

Description

technical field [0001] The invention belongs to the technical field of recycling waste batteries, and in particular relates to a method for preparing lithium iron phosphate cathode materials by recycling waste lithium iron phosphate batteries. Background technique [0002] In recent years, my country's electric vehicle industry has developed rapidly, and in the future, the sales of electric vehicles in my country will continue to grow at a high speed. The rapid development of the electric vehicle industry has also promoted the development of power batteries. Lithium iron phosphate batteries are widely used in power batteries due to their advantages such as no precious metals, relatively low cost of use, and strong safety and stability. Therefore, when the era of large-scale scrapping of electric vehicles in my country comes, the recycling of lithium iron phosphate batteries will become very urgent. [0003] At present, there are mainly two methods for recycling waste lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 王成彦张家靓刘玉博马保中陈永强张文娟杨成荆乾坤邢鹏
Owner GUANGDONG GUANGHUA SCI TECH
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