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Method for regenerating graphite negative electrode of waste lithium cobalt oxide battery

A graphite anode, lithium cobalt oxide technology, applied in battery recycling, chemical instruments and methods, waste collector recycling, etc., can solve the problems of incomplete pyrolysis or incineration, unfavorable widespread promotion, high cost, and improve the permeability of graphite. Effect

Pending Publication Date: 2022-02-08
SHENZHEN QINGYAN EQUIP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of dissolving the binder with an organic solvent is expensive, which is not conducive to widespread promotion. Although the cost of high-temperature pyrolysis or incineration is low, the pyrolysis or incineration is not complete, and the gas pollution that will be produced will pollute the environment and other problems.

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  • Method for regenerating graphite negative electrode of waste lithium cobalt oxide battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] S1 Discharge the waste lithium cobalt oxide battery through the charge and discharge machine for about 4 hours (multiple discharges to ensure that the battery voltage is lower than 1V), and then automatically disassemble and separate the positive and negative electrodes through mechanical crushing, magnetic separation, screening and other methods. Powder, battery case, copper foil, aluminum foil and diaphragm, after dismantling, the battery case, copper foil, aluminum foil and diaphragm are directly recycled;

[0045] S2 Place the obtained positive and negative electrode powders in a sulfuric acid solution containing hydrogen peroxide, mix and stir, the sulfuric acid concentration is 2mol / L, the hydrogen peroxide content is 6wt%, the solid-liquid ratio is 100g / L, and acid leaching is carried out at a temperature of 80°C 2h, to obtain an acidic solid-liquid mixture; after the acidic solid-liquid mixture is filtered, the filtrate containing the positive electrode material ...

Embodiment 2

[0052] S1 Discharge the waste lithium cobalt oxide battery through the charge and discharge machine for about 4 hours (multiple discharges to ensure that the battery voltage is lower than 1V), and then automatically disassemble and separate the positive and negative electrodes through mechanical crushing, magnetic separation, screening and other methods. Powder, battery case, copper foil, aluminum foil and diaphragm, after dismantling, the battery case, copper foil, aluminum foil and diaphragm are directly recycled;

[0053] S2 Place the obtained positive and negative electrode powders in a sulfuric acid solution containing hydrogen peroxide, mix and stir, the sulfuric acid concentration is 3mol / L, the hydrogen peroxide content is 5wt%, the solid-liquid ratio is 90g / L, and acid leaching is carried out at a temperature of 90°C 1.5h to obtain an acidic solid-liquid mixture; after filtering the acidic solid-liquid mixture, the filtrate containing the positive electrode material an...

Embodiment 3

[0060] S1 Discharge the waste lithium cobalt oxide battery through the charge and discharge machine for about 4 hours (multiple discharges to ensure that the battery voltage is lower than 1V), and then automatically disassemble and separate the positive and negative electrodes through mechanical crushing, magnetic separation, screening and other methods. Powder, battery case, copper foil, aluminum foil and diaphragm, after dismantling, the battery case, copper foil, aluminum foil and diaphragm are directly recycled;

[0061] S2 Place the obtained positive and negative electrode powders in a sulfuric acid solution containing hydrogen peroxide, mix and stir, the sulfuric acid concentration is 2mol / L, the hydrogen peroxide content is 4wt%, the solid-liquid ratio is 80g / L, and acid leaching is carried out at a temperature of 100°C 1h, to obtain an acidic solid-liquid mixture; after filtering the acidic solid-liquid mixture, obtain the filtrate containing the positive electrode mate...

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Abstract

The invention provides a method forregenerating a graphite negative electrode of a waste lithium cobalt oxide battery. The method comprises the following steps: crushing, disassembling and separating the waste lithium cobalt oxide battery to obtain a copper foil, an aluminum foil and positive and negative electrode mixed powder; carrying out acid leaching treatment on the positive and negative electrode mixed powder, performing filtering to obtain filtrate and filter residues I, removing impurities from the filtrate, and recovering metal element cobalt, wherein the filter residues I are an acid-insoluble graphite negative electrode and an adhesive; preparing the filter residues I into granular filter residues II with a certain particle size, then putting the granular filter residues II into a column leaching container, circularly spraying for a certain time, then carrying out ball milling treatment on the obtained filter residues III to obtain fine powder filter residues IV, and roasting the fine powder filter residues IV in an air atmosphere and then in an inert atmosphere to obtain regenerated graphite particles. According to the method, the technological process is short, the waste lithium ion battery is turned into wealth by utilizing the adhesive in the waste lithium ion battery, and the use amount of waste water or waste acid is small, so that the recovery cost of graphite is reduced, energy consumption and pollution are reduced, and the regeneration utilization rate of the graphite negative electrode is high.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium ion batteries, and in particular relates to a method for regenerating graphite negative electrodes of waste lithium cobalt oxide batteries. Background technique [0002] In recent years, with the rapid development of electric vehicles, 5G energy storage base stations and 3C fields, the demand for lithium-ion batteries continues to increase. If a large number of discarded lithium-ion batteries cannot be effectively disposed of, it will not only waste resources, but also The environment causes certain pollution. [0003] At present, the recovery of waste lithium-ion batteries is focused on the recovery of valuable metals, while the research on the recovery of graphite negative electrodes is less. The recovery of graphite negative electrodes in the prior art mainly uses low solid-liquid ratio acid leaching to remove graphite. Impurities, the acid consumption in the recovery process i...

Claims

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Application Information

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IPC IPC(8): H01M10/54B09B3/24B09B3/40B09B5/00B09B101/02B09B101/16
CPCH01M10/54B09B3/00B09B5/00Y02W30/84
Inventor 田勇傅婷婷叶利强陈建军符冬菊张莲茜张维丽
Owner SHENZHEN QINGYAN EQUIP TECH CO LTD