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Method for safely and efficiently recycling lithium from waste battery

A waste battery, safe technology, applied in the direction of battery recycling, recycling technology, waste collector recycling, etc., can solve the problems of high risk of negative electrode materials, hidden safety hazards, complicated operation, etc., to achieve optimized electrode structure rearrangement, safety High, easy-to-operate effect

Active Publication Date: 2021-07-02
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has relatively serious safety hazards. It is very dangerous to directly treat the negative electrode material in the lithium intercalation state with water, and the impurity removal process is designed with multiple elements, the operation is complicated, and the final product obtained may contain more impurities.

Method used

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  • Method for safely and efficiently recycling lithium from waste battery
  • Method for safely and efficiently recycling lithium from waste battery
  • Method for safely and efficiently recycling lithium from waste battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) Use the constant current and constant voltage three-stage charging method to charge the waste nickel-cobalt lithium manganese oxide battery. When the charging voltage reaches 3.5V, change to constant current charging until the voltage reaches 4.3V, and then change to constant charging again. Voltage charging, until the charging current density drops to 10% of the constant current charging current density, the voltage remains stable, and the charging is stopped;

[0055] (2) disassemble the waste lithium-ion battery in a dry room with a relative humidity of 5%, take out the disassembled negative electrode, and cut it to a suitable size;

[0056] (3) Plasma treatment of the negative plate: using Ar / N 2 As a gas source, its power is 80W, the processing time is 5min, the flow rate of working gas is 30sccm, and then naturally cooled to room temperature;

[0057] (4) Prepare the leaching solution, add 15.4 g of biphenyl and 100 ml of diethylene glycol dimethyl ether solv...

Embodiment 2

[0063] (1) Use the constant current and constant voltage three-stage charging method to charge the waste lithium iron phosphate battery. When the charging voltage reaches 3.5V, change to constant current charging until the voltage reaches 4.2V, and then change to constant voltage charging again. , until the charging current density drops to 10% of the constant current charging current density, the voltage remains stable, and the charging is stopped;

[0064] (2) disassemble the waste lithium-ion battery in a dry room with a relative humidity of 5%, take out the disassembled negative electrode, and cut it to a suitable size;

[0065] (3) Plasma treatment of the appropriate negative plate: using Ar / N 2 As a gas source, its power is 80W, the processing time is 5min, the flow rate of working gas is 50sccm, and then naturally cooled to room temperature;

[0066] (4) Configure the leaching solution, add 12.8g of naphthalene and 100ml of diethylene glycol dimethyl ether solvent into...

Embodiment 3

[0071] (1) Use the constant current and constant voltage three-stage charging method to charge the waste lithium iron phosphate battery. When the charging voltage reaches 3.5V, change to constant current charging until the voltage reaches 4.2V, and then change to constant voltage charging again. , until the charging current density drops to 10% of the constant current charging current density, the voltage remains stable, and the charging is stopped;

[0072] (2) disassemble the waste lithium-ion battery in a dry room with a relative humidity of 5%, take out the disassembled negative electrode, and cut it to a suitable size;

[0073] (3) Plasma treatment of the appropriate negative plate: using Ar / N 2 As a gas source, its power is 100W, the processing time is 5min, the influx of working gas is 50sccm, and then naturally cooled to room temperature;

[0074] (4) Configure the leaching solution, add 17.8g phenanthrene and 100ml diethylene glycol dimethyl ether solvent into the fl...

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Abstract

The invention provides a method for safely and efficiently recycling lithium from a waste battery. The method comprises the following steps of charging the recycled waste battery, disassembling in a safe environment, sorting out a negative plate, cleaning the negative plate by using a leaching solution, after the lithium in a negative electrode reacts with a solvent, stripping graphite from a current collector, separating out filtrate and filter residue, and using a lithium-containing enriched liquid as a chemical pre-lithiation reagent to be re-applied to the negative electrode of the lithium ion battery. According to the method, the lithium element in the battery is safely and efficiently extracted by selecting the leaching solution, a prepared lithium supplementing solution with high additional value is applied to the negative electrode of the battery again, the operation is simple, and the safety is high.

Description

technical field [0001] The invention designs a lithium recycling method, in particular to a lithium recycling method from waste lithium batteries. Background technique [0002] Rapid industrial development and increasing wealth in modern society have highlighted the importance of developing a sustainable and environmentally friendly economy. Energy crisis and environmental pollution have become research hotspots, among which a large number of studies focus on the development of advanced electrochemical energy storage technology and electric vehicles, lithium-ion batteries are an important part. In 2018, the installed capacity of lithium-ion batteries exceeded 86% in the field of electrochemical energy storage, and the global electric vehicle inventory and newly registered electric vehicles exceeded 5.12 million and 1.97 million respectively. Electric vehicles will reach 253 million. This also means a huge consumption of lithium resources. Although lithium-ion batteries ha...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/00C22B26/12H01M10/42H01M10/54
CPCC22B1/005C22B7/006C22B26/12H01M10/4235H01M10/54Y02E60/10Y02W30/84Y02P10/20
Inventor 郭玉国常昕孟庆海范敏殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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