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Closed-loop recycling method of lithium in lithium ion batteries

A lithium-ion battery, closed-loop technology, applied in battery recycling, recycling technology, battery electrodes, etc., can solve problems such as high energy consumption, non-compliance with energy conservation and emission reduction, reduce intermediate processing links, suitable for large-scale promotion, and enrich recycling effect of technology

Active Publication Date: 2021-12-28
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This scheme focuses on the irreversible loss of lithium in the first cycle of the negative electrode side, which improves the first-cycle Coulombic efficiency of the battery, but this scheme is only suitable for the pre-lithiation of the negative electrode side.
[0008] On the one hand, the loss of lithium in the positive electrode material is one of the reasons for the decline in battery performance, and direct lithium regeneration of the spent positive electrode is an important recycling strategy; on the other hand, the composition, structure, and reaction mechanism of the positive electrode material and the negative electrode Different, the pre-lithiation research on the negative electrode side of the battery cannot be directly applied to the regeneration of waste positive electrode materials.
At present, the method of direct lithium supplementation and regeneration of the positive electrode usually needs to be carried out under high temperature and high pressure, but this method of high energy consumption does not meet the goals of energy saving and emission reduction in the future.

Method used

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  • Closed-loop recycling method of lithium in lithium ion batteries
  • Closed-loop recycling method of lithium in lithium ion batteries
  • Closed-loop recycling method of lithium in lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Disassemble the recycled waste batteries in a safe environment, and sort out the negative electrode pieces: in a drying room with a relative humidity of 5%, disassemble the waste nickel-cobalt manganate lithium batteries charged to 4.3V, and sort out Negative electrode sheet, to clean the residual lithium salt on the surface;

[0058] (2) Leach, separate and enrich the negative electrode sheet with the leaching solution to obtain a lithium enrichment solution: configure the leaching solution, add 20.2 g of pyrene and 100 ml of ethylene glycol dimethyl ether solvent into the flask, and stir until it becomes clear and transparent solution;

[0059] The cut negative electrode pieces were put into the leaching solution in batches, the leaching temperature was 60°C, and the solid-liquid mass ratio was 1:3. The leaching time was 2 hours. After the leaching is completed, the solution is suction filtered, separated, and the enriched solution of organolithium is obtained b...

Embodiment 2

[0064] (1) Disassemble the recycled waste batteries in a safe environment, and sort out the negative electrode pieces: Disassemble the waste nickel-cobalt manganate batteries charged to 4.3V in a drying room with a relative humidity of 5%, and sort out Negative electrode sheet, to clean the residual lithium salt on the surface;

[0065] (2) Leach, separate and enrich the negative electrode sheet with the leaching solution to obtain a lithium enrichment solution: configure the leaching solution, add 20.2 g of pyrene and 100 ml of ethylene glycol dimethyl ether solvent into the flask, and stir until it becomes clear and transparent solution;

[0066] The cut negative electrode sheets were put into the leaching solution in batches, the leaching temperature was 60°C, the mass ratio was 1:3, and the leaching time was 2 hours. After the leaching is completed, the solution is suction filtered, separated, and the enriched solution of organolithium is obtained by evaporating the solve...

Embodiment 3

[0071] (1) Disassemble the recycled waste batteries in a safe environment, and sort out the negative electrode pieces: Disassemble the waste nickel-cobalt manganate batteries charged to 4.3V in a drying room with a relative humidity of 5%, and sort out Negative electrode sheet, to clean the residual lithium salt on the surface;

[0072] (2) Leach, separate and enrich the negative electrode sheet with the leaching solution to obtain a lithium enrichment solution: configure the leaching solution, add 20.2 g of pyrene and 100 ml of ethylene glycol dimethyl ether solvent into the flask, and stir until it becomes clear and transparent solution; put the cut negative electrode pieces into the leaching solution in batches, the leaching temperature is 60°C, and the mass ratio is 1:3. The leaching time was 2 hours. After the leaching is completed, the solution is suction filtered, separated, and the enriched solution of organolithium is obtained by evaporating the solvent.

[0073] (3...

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Abstract

The invention relates to a closed-loop recycling method of lithium in lithium ion batteries. The method comprises the following steps that recovered waste batteries are disassembled in a safe environment, and negative plates are sorted out; the negative plates are leached, separated and enriched by the aid of a leaching solution to obtain a lithium-enriched solution; recovered waste positive electrode materials are added into the lithium-enriched solution for reaction to realize lithium supplementation of the positive electrode material; and impurities are removed from the lithium-supplemented positive electrode materials to obtain regenerated positive electrode materials. According to the method, the lithium in the negative electrodes of the batteries is safely and efficiently extracted through screening of the leaching solution and can be directly applied to lithium supplement of the positive electrodes of the waste batteries again, closed-loop recycling of the lithium in the batteries is achieved, the energy consumption in the recovering process is greatly reduced, operation is easy, and safety is high.

Description

technical field [0001] The invention relates to a method for closed-loop recovery and reuse of lithium in lithium ion batteries, in particular to a method for recovering lithium from waste and old lithium ion batteries and then re-applying it in the positive electrode of the battery. Background technique [0002] The demand for lithium-ion batteries (LIBs) has grown significantly over the past decade, driven by consumer electronics. Today, there are 7.19 billion mobile phones, nearly 1 billion laptops, and 1 billion tablet computers in the world. Not only does the demand for LIBs in the consumer electronics field maintain a high level, but the gradual replacement of fuel vehicles by electric vehicles has also stimulated the development of LIBs based on the transition from fossil energy to clean energy. On this basis, the consumption of corresponding battery materials has also increased. China is already the world's largest lithium metal extractor and importer. A substanti...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B7/00H01M10/54H01M4/505H01M4/525H01M10/0525
CPCH01M10/54H01M10/0525H01M4/525H01M4/505C22B7/006C22B26/12Y02E60/10Y02P10/20Y02W30/84
Inventor 郭玉国常昕孟庆海范敏顾超凡殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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