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Regeneration method of lithium ion battery negative electrode graphite

A lithium-ion battery and graphite technology, applied in battery electrodes, secondary batteries, battery recycling, etc., to achieve the effects of easy operation, easy promotion and application, and good structural integrity

Inactive Publication Date: 2020-06-16
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the existing lithium-ion battery recovery methods, to provide a regeneration method that is easy to operate, low in processing costs and low in energy consumption, and utilizes graphite slag produced during the recovery of metal ions in lithium-ion batteries to prepare graphite

Method used

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  • Regeneration method of lithium ion battery negative electrode graphite
  • Regeneration method of lithium ion battery negative electrode graphite
  • Regeneration method of lithium ion battery negative electrode graphite

Examples

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Effect test

Embodiment 1

[0035] A regeneration method for lithium-ion battery negative electrode graphite, comprising the following steps:

[0036] (1) Discharging, crushing, hydrometallurgy and pyrometallurgy are performed on the negative electrode of the waste battery to obtain graphite slag;

[0037] (2) Put the graphite slag into an oven and dry at 50°C for 24 hours, pass through a 400-mesh sieve, and then keep the graphite slag in air at 360°C for 12 hours;

[0038] (3) Put the graphite slag treated in step (2) into 0.1mol / L sulfuric acid solution for soaking, ultrasonic treatment for 2h, to obtain solution A;

[0039] (4) The solution A was subjected to solid-liquid separation, the precipitate was collected, the pH was adjusted to 7 after adding deionized water, and 0.01mol / LEDTA was added to obtain the solution B;

[0040] (5) The solution B is subjected to solid-liquid separation, the precipitate is collected, and the precipitate is repeatedly washed with deionized water and absolute ethanol ...

Embodiment 2

[0042] A regeneration method for lithium-ion battery negative electrode graphite, comprising the following steps:

[0043] (1) Discharging, crushing, hydrometallurgy and pyrometallurgy are performed on the negative electrode of the waste battery to obtain graphite slag;

[0044] (2) Put the graphite slag into an oven and dry it at 50°C for 24 hours, pass through a 400-mesh sieve, and then keep the graphite slag in air at 480°C for 12 hours;

[0045] (3) Put the graphite slag treated in step (2) into 0.1mol / L sulfuric acid solution for soaking, ultrasonic treatment for 2h, to obtain solution A;

[0046] (4) The solution A was subjected to solid-liquid separation, the precipitate was collected, the pH was adjusted to 7 after adding deionized water, and 0.01mol / LEDTA was added to obtain the solution B;

[0047] (5) The solution B is subjected to solid-liquid separation, the precipitate is collected, and the precipitate is repeatedly washed with deionized water and absolute ethan...

Embodiment 3

[0049] A regeneration method for lithium-ion battery negative electrode graphite, comprising the following steps:

[0050] (1) Discharging, crushing, hydrometallurgy and pyrometallurgy are performed on the negative electrode of the waste battery to obtain graphite slag;

[0051] (2) Put the graphite slag into an oven and dry at 50°C for 24 hours, pass through a 400-mesh sieve, and then keep the graphite slag in air at 360°C for 12 hours;

[0052] (3) Put the graphite slag processed in step (2) into 5mol / L sulfuric acid solution for soaking, and ultrasonically treat for 2h to obtain solution A;

[0053] (4) The solution A was subjected to solid-liquid separation, the precipitate was collected, the pH was adjusted to 7 after adding deionized water, and 0.01mol / LEDTA was added to obtain the solution B;

[0054](5) The solution B is subjected to solid-liquid separation, the precipitate is collected, and the precipitate is repeatedly washed with deionized water and absolute ethano...

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Abstract

The invention belongs to the field of battery material recovery, and discloses a lithium ion battery negative electrode graphite regeneration method, wherein the method comprises the following steps:(1) carrying out discharging, crushing, hydrometallurgy and pyrometallurgy on waste battery negative electrodes to obtain graphite slag; (2) drying and sieving the graphite slag, and then carrying outheat treatment; (3) putting the graphite slag treated in the step (2) into an acid solution, and carrying out ultrasonic treatment to obtain a solution A; (4) performing solid-liquid separation on the solution A, collecting precipitates, adjusting the pH to 7-10, and adding a chelating agent to obtain a solution B; and (5) carrying out solid-liquid separation on the solution B, collecting precipitates, and washing and drying to obtain the graphite. According to the method, dilute acid and environment-friendly EDTA are used as metal complexing agents, operation is convenient, cost is low, large-scale production can be achieved easily, and application and popularization are convenient.

Description

technical field [0001] The invention belongs to the field of battery material recycling, and in particular relates to a method for regenerating negative electrode graphite of a lithium ion battery. Background technique [0002] With the advantages of high energy density, long life, and environmental friendliness, lithium-ion batteries are currently one of the most attractive energy storage devices and are playing an increasingly important role in modern society. With the large-scale application of lithium-ion batteries, waste power lithium-ion batteries will also increase year by year, and the resulting environmental problems and resource reuse issues have attracted widespread attention. Waste lithium-ion batteries contain a large amount of metal elements and electrolytes. Such toxic substances, if discarded at will, will cause serious pollution to the environment. Therefore, it is of great significance to recycle it as a resource, and it can also produce certain economic b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/215H01M10/54H01M4/587H01M10/0525
CPCC01B32/215H01M4/587H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 吴小锋吴琳张振华王凤梅邹柯阮丁山李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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