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A kind of recycling method of waste lithium ion battery negative plate

A technology for lithium-ion batteries and recycling methods, which is applied in the field of recycling waste lithium-ion battery negative electrodes, can solve the problems of low graphite purity, complicated operation process, and a large amount of oxidants, and achieve high electrochemical performance, high purity, and low method cost. low effect

Active Publication Date: 2022-02-11
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are only a small number of literature reports to recover the negative electrode graphite of waste lithium-ion batteries by flotation, but the purity of graphite obtained by this method is not high, and a large amount of flotation agent needs to be added; However, this method not only has a complicated operation process, but also requires a large amount of oxidant, and more importantly, the use of a large amount of oxidant will lead to a large amount of pollution and waste of resources.

Method used

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  • A kind of recycling method of waste lithium ion battery negative plate
  • A kind of recycling method of waste lithium ion battery negative plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Place the negative electrode sheet of the waste lithium-ion battery in the first stirred tank, add 20v / v% ethanol solution (the amount added is to control the negative electrode sheet to be completely immersed in the ethanol solution), stir for 10min, and make the The negative electrode material falls off completely in the solution, and the obtained material is sent to a sieve, and the oversize is collected as copper foil, and then the solid matter is collected from the undersize to obtain a powder;

[0029] 2) Dry the obtained powder at 60°C, pass through a 150-mesh sieve after grinding, and collect the undersize, which is graphite powder;

[0030] 3) The obtained graphite powder is placed in the second stirring tank, and then 30w / w% sulfuric acid solution is added (the amount added is to control the graphite powder to be completely immersed in the ethanol solution), stirred and reacted at room temperature for 0.5h, and then heated to 90°C for reaction 11h, the resu...

Embodiment 2

[0038] 1) Place the negative electrode sheet of the waste lithium-ion battery in the first stirred tank, add 50v / v% ethanol solution (the amount added is to control the negative electrode sheet to be completely immersed in the ethanol solution), stir for 55min, and make the The negative electrode material falls off completely in the solution, and the obtained material is sent to a sieve, and the oversize is collected as copper foil, and then the solid matter is collected from the undersize to obtain a powder;

[0039] 2) Dry the obtained powder at 80°C, pass through a 200-mesh sieve after grinding, and collect the under-sieve, which is graphite powder;

[0040] 3) The obtained graphite powder is placed in the second stirred tank, and then 50w / w% sulfuric acid solution is added (the amount added is to control the graphite powder to be completely immersed in the ethanol solution), stirred and reacted at room temperature for 8h, then heated to 90°C for 3h , the resulting material...

Embodiment 3

[0048] 1) Place the negative electrode sheet of the waste lithium-ion battery in the first stirred tank, add 10v / v% ethanol solution (the amount added is to control the negative electrode sheet to be completely immersed in the ethanol solution), stir for 30min, and make the The negative electrode material falls off completely in the solution, and the obtained material is sent to a sieve, and the oversize is collected as copper foil, and then the solid matter is collected from the undersize to obtain a powder;

[0049] 2) Dry the obtained powder at 80°C, pass through a 250-mesh sieve after grinding, and collect the under-sieve, which is graphite powder;

[0050] 3) The obtained graphite powder is placed in the second stirred tank, and then 40w / w% sulfuric acid solution is added (the amount added is to control the graphite powder to be completely immersed in the ethanol solution), stirred and reacted at room temperature for 6h, then heated to 70°C for 6h , the resulting material...

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Abstract

The invention discloses a method for recovering the negative electrode sheet of the waste lithium ion battery, which comprises the following steps: 1) taking the negative electrode sheet of the waste lithium ion battery and immersing or stirring it in an ethanol solution to separate the metal foil from the slurry; 2) obtaining the slurry 3) the obtained graphite powder is reacted with sulfuric acid solution, filtered, and the filtrate and filter residue are collected respectively; 4) the obtained filter residue is sintered at a high temperature to obtain graphite oxide; The mass ratio of 30 is mixed and then sintered at 500-800°C for 3-9h under protective atmosphere conditions to obtain Fe / Fe 3 o 4 / C Composite. The method of the present invention has low cost and simple process, and can realize the complete separation of metal foil, a small amount of lithium and a large amount of graphite powder in the negative electrode sheet, and the Fe / Fe obtained by the method 3 o 4 When the / C composite material is applied to the negative electrode of lithium-ion batteries again, it can obtain a higher initial discharge specific capacity and have a better retention rate.

Description

technical field [0001] The invention relates to the recycling of lithium-ion batteries, in particular to a method for recycling the negative plates of waste lithium-ion batteries. Background technique [0002] Lithium-ion batteries have been widely used in tablet computers, smartphones, electric vehicles and hybrid electric vehicles. Lithium-ion batteries have a certain service life, generally about 3-5 years. With the continuous increase of market demand and sales volume of lithium-ion batteries, a large amount of waste lithium-ion batteries are produced thereupon. The electrolyte and heavy metals such as copper and nickel in waste lithium-ion batteries will seep into garbage and soil after leakage, causing serious pollution to surface water, groundwater, soil and the ecological environment, and endangering human health. On the other hand, waste lithium-ion batteries contain a large amount of rare and precious metals such as nickel, cobalt, manganese, lithium, etc., which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M4/36H01M4/38H01M4/52H01M4/62H01M10/0525
CPCH01M10/54H01M4/362H01M4/38H01M4/523H01M4/625H01M10/0525Y02W30/84Y02E60/10
Inventor 刘葵杨生龙范小萍张鹏王红强黄有国蔡业政李庆余
Owner GUANGXI NORMAL UNIV