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A method for recycling and regenerating positive electrode materials of lithium iron phosphate waste batteries

A technology for lithium iron phosphate and waste batteries, which is applied in the field of recycling and regeneration of lithium iron phosphate waste battery cathode materials, can solve the problems of secondary pollution of waste liquid and waste gas, strict control of process parameters, and numerous process steps, so as to protect the environment and avoid secondary pollution. Secondary pollution, simple and quick process effect

Active Publication Date: 2021-08-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Analyzing the existing technology, there are the following problems in the recovery process of hydrometallurgy: 1. There are many process steps, and the process parameters need to be strictly controlled; 2. A large amount of reagents are consumed, a large amount of impurity ions are introduced, and the cost of recovery is increased; 3. , The process of treatment and recycling usually produces secondary pollution such as waste liquid and gas, which needs to be equipped with additional devices for collection and treatment

Method used

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  • A method for recycling and regenerating positive electrode materials of lithium iron phosphate waste batteries
  • A method for recycling and regenerating positive electrode materials of lithium iron phosphate waste batteries
  • A method for recycling and regenerating positive electrode materials of lithium iron phosphate waste batteries

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Effect test

Embodiment 1

[0037] 1) Firstly, after the recycled lithium iron phosphate waste battery is fully discharged, the open circuit voltage after discharge is 0.8V, and then disassembled to take out the positive plate (the content of lithium iron phosphate is 84.6%, and the content of aluminum is 12.1%);

[0038] 2) Wash the positive electrode sheet with dimethyl carbonate, remove the residual electrolyte on the positive electrode sheet, and place the positive electrode sheet from which the residual electrolyte solution has been removed in a vacuum oven at 80°C to dry;

[0039]3) Accurate step 2) weigh 3g of the obtained positive electrode sheet, put it into 100ml of stearic acid mass fraction of 1% water dispersion, in order to further accelerate mass transfer, cut the positive electrode sheet into a size of 2cm × 2cm, and adjust the rotation speed to 500r / min, stirring at 25°C for 5min;

[0040] 4) Sieve the current collector aluminum out of the final mixture obtained in step 3) using a 40-mes...

Embodiment 2

[0043] All the other are the same as Example 1, except that the mass fraction of stearic acid is 3%.

Embodiment 3

[0045] All the other are the same as Example 1, except that the mass fraction of stearic acid is 5%.

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Abstract

The invention provides a method for reclaiming and regenerating positive electrode materials of lithium iron phosphate waste batteries, which comprises the following steps: dismantling the recovered waste lithium iron phosphate batteries after fully discharging, taking out the positive electrode sheet; cleaning the positive electrode sheet with an organic solvent, removing Residual electrolyte, dry; immerse the dried positive electrode sheet in the dispersion formed by organic acid and water, heat and stir; sieve the mixture in the previous step, separate the current collector, and obtain a suspension, which is evaporated under stirring dry and vacuum-dry to obtain recovered material powder; determine elemental Li and Fe content, supplement lithium, mix well, and roast the mixed material under an inert atmosphere to obtain recovered and regenerated positive electrode material. The present invention uses the above-mentioned dispersion liquid to separate the current collector and the positive electrode active material, which greatly improves the recovery rate of aluminum and lithium iron phosphate and the separation efficiency of the two. The step of recycling aluminum reduces costs and avoids secondary pollution to the environment.

Description

technical field [0001] The invention relates to the field of recycling lithium iron phosphate waste batteries, in particular to a method for recycling and regenerating positive electrode materials of lithium iron phosphate waste batteries. Background technique [0002] Since the commercialization of lithium-ion batteries in the 1990s, it has received widespread attention and attention. Due to the advantages of high operating voltage, portability, and high energy density, lithium-ion batteries have been widely used in mobile phones, notebook computers, cameras, In modern electronic equipment such as electric vehicles. With the advancement of technology, the production and demand of lithium-ion batteries are increasing day by day. For example, from 2000 to 2010, the global growth rate was 800%, and with its further potential applications in electric vehicles and smart grids, the demand for lithium-ion batteries is even higher. increasingly exacerbated. According to estimates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M4/58H01M4/62H01M10/0525C01B25/45C01B32/05
CPCC01B25/45C01P2002/72C01P2004/03C01P2006/40C01B32/05H01M4/5825H01M4/62H01M10/0525H01M10/54H01M2004/028Y02E60/10Y02W30/84
Inventor 郭玉国范敏孟庆海殷雅侠万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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