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Method for recycling lithium from waste lithium ion battery

A lithium-ion battery and lithium recovery technology, which is applied in the field of lithium recovery from waste lithium-ion batteries, can solve problems such as high working voltage, environmental hazards, and high energy density

Pending Publication Date: 2022-01-21
LONGNAN JINTAIGE COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, and no memory effect. They have been widely used in daily life. Because of this, a large number of lithium-ion batteries are produced and consumed
Due to the limited cycle life of lithium-ion batteries, they have to be discarded after a period of use, and these discarded lithium-ion batteries usually cause certain harm to the environment, and the metals rich in waste lithium-ion batteries are important scarce resources; To protect the environment, save resources, and at the same time be able to recycle resources, it is necessary to develop waste lithium-ion battery recycling technology
At present, the research work on the recovery of lithium-ion batteries has made important progress, but the recovery of lithium still has the defects of low recovery rate and low purity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of method that the present invention proposes reclaims lithium from waste lithium ion battery, comprises the following steps:

[0024] S1. Discharge and disassemble the waste lithium-ion battery to obtain the positive electrode sheet;

[0025] S2. Cut the positive electrode sheet into pieces and place it in a mixture of N-methylpyrrolidone and dimethylacetamide. In the mixture of N-methylpyrrolidone and dimethylacetamide, N-methylpyrrolidone , The volume ratio of dimethylacetamide is 1:3, soak at 75°C for 20 minutes, then add the mixture of orange juice and water, in the mixture of orange juice and water, the weight ratio of orange juice and water is 1:1 , stirring at 75°C for 5 minutes, and ultrasonicating for 30 minutes to pick out the aluminum foil, filter and dry to obtain the positive electrode active material; the power of the ultrasonic wave is 400W;

[0026] S3. Mix the positive electrode active material with citric acid evenly, roast at 170°C for 90min,...

Embodiment 2

[0031] A kind of method that the present invention proposes reclaims lithium from waste lithium ion battery, comprises the following steps:

[0032] S1. Discharge and disassemble the waste lithium-ion battery to obtain the positive electrode sheet;

[0033] S2. Cut the positive electrode sheet into pieces and place it in a mixture of N-methylpyrrolidone and dimethylacetamide. In the mixture of N-methylpyrrolidone and dimethylacetamide, N-methylpyrrolidone , The volume ratio of dimethylacetamide is 1:5, soak at 70°C for 35min, then add the mixture of orange juice and water, in the mixture of orange juice and water, the weight ratio of orange juice and water is 0.05:1 , stirred at 65°C for 15 minutes, ultrasonicated for 10 minutes, the power of the ultrasonic wave was 500W, the aluminum foil was picked out, filtered and dried to obtain the positive electrode active material;

[0034] S3. Mix the positive electrode active material with citric acid evenly, roast at 280°C for 50mi...

Embodiment 3

[0039] A kind of method that the present invention proposes reclaims lithium from waste lithium ion battery, comprises the following steps:

[0040] S1. Discharge and disassemble the waste lithium-ion battery to obtain the positive electrode sheet;

[0041]S2. Cut the positive electrode sheet into pieces and place it in a mixture of N-methylpyrrolidone and dimethylacetamide. In the mixture of N-methylpyrrolidone and dimethylacetamide, N-methylpyrrolidone , The volume ratio of dimethylacetamide is 1:3, soak at 75°C for 25min, then add the mixture of orange juice and water, in the mixture of orange juice and water, the weight ratio of orange juice and water is 0.15:1 , stirred at 73°C for 8 minutes, and picked out the aluminum foil after ultrasonication for 25 minutes, filtered and dried to obtain the positive electrode active material; the power of the ultrasonic wave was 300W;

[0042] S3. Mix the positive electrode active material with citric acid evenly, roast at 180°C for ...

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PUM

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Abstract

The invention discloses a method for recovering lithium from a waste lithium ion battery. The method comprises the following steps: discharging the waste lithium ion battery, cutting a positive plate obtained by disassembling the waste lithium ion battery into blocks, soaking the blocks in a mixed solution of N-methyl pyrrolidone and dimethylacetamide, adding a mixed solution of orange juice and water, stirring, carrying out ultrasonic treatment, picking out an aluminum foil, filtering and drying to obtain a positive active material, uniformly mixing with a citric acid, roasting, uniformly mixing with sodium citrate, roasting, mixing with sodium hydroxide and sodium persulfate, and carrying out microwave roasting; leaching the roasted product in water, carrying out solid-liquid separation to obtain a filtrate A, adjusting the pH value of the filtrate A to be neutral, filtering, adding sodium sulfide, adjusting the pH value to be 8-10, stirring, and carrying out solid-liquid separation to obtain a filtrate B; and adjusting the pH value of the filtrate B to 2-3, mixing the filtrate B with a mixture of 1-carboxymethyl-3-methylimidazolium hexafluorophosphate, the acetic acid and tributyl phosphate, stirring at a room temperature for 10-35 minutes, and centrifuging. The method provided by the invention is simple and feasible in process, high in lithium ion recovery rate and good in purity.

Description

technical field [0001] The invention relates to the technical field of battery recovery, in particular to a method for recovering lithium from waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, and no memory effect. They have been widely used in daily life. Because of this, a large number of lithium-ion batteries are produced and consumed. Due to the limited cycle life of lithium-ion batteries, they have to be discarded after a period of use, and these discarded lithium-ion batteries usually cause certain harm to the environment, and the metals rich in waste lithium-ion batteries are important scarce resources; To protect the environment, save resources, and be able to recycle resources at the same time, it is necessary to develop waste lithium-ion battery recycling technology. At present, important progress has been made in the research work on the recovery of l...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 黎永忠林福洋钟宇威肖立华蔡星明
Owner LONGNAN JINTAIGE COBALT IND CO LTD
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