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Method for safely recycling waste pole piece of lithium ion battery, and application thereof

A lithium-ion battery and pole piece technology, which is applied in the field of safe recycling of lithium-ion battery waste pole pieces, can solve problems such as obvious production process limitations, explosion, combustion, etc., so as to reduce the probability of ignition, ensure safety, and eliminate fire or explosion. Effect

Active Publication Date: 2021-07-16
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there will be acid and water remaining after the aluminum slag is washed, the sorted aluminum slag will react with the residual acid and water, release hydrogen and generate heat, and there is a risk of combustion and explosion when the aluminum slag is stored
At the same time, there is residual aluminum in the battery powder obtained by sorting. In the next step of acid leaching, the residual aluminum will react with acid to release hydrogen gas, causing the risk of combustion and explosion in the acid leaching process. The traditional production process has obvious limitations.

Method used

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  • Method for safely recycling waste pole piece of lithium ion battery, and application thereof
  • Method for safely recycling waste pole piece of lithium ion battery, and application thereof
  • Method for safely recycling waste pole piece of lithium ion battery, and application thereof

Examples

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Effect test

Embodiment 1

[0042] The method for the safe recovery of lithium-ion battery waste pole pieces of the present embodiment comprises the following specific steps:

[0043](1) Crushing and sieving the waste positive electrode sheet to obtain positive electrode powder A and crushed aluminum slag;

[0044] (2) Mix the crushed aluminum slag with 0.1mol / L sulfuric acid at a solid-to-liquid ratio of 1:5kg / L, and ultrasonically while stirring, the stirring speed is 500r / min, and the mixing time is 60min, to obtain the crushed aluminum after pickling slag;

[0045] (3) Adopt wet sieving to sieve the crushed aluminum slag after pickling, take out the sieve from the acid solution, which is mainly aluminum slag, and the sieve is mainly battery powder, and filter the sieve, Take the filter residue and wash the filter residue with water to obtain positive electrode powder B;

[0046] (4) Mix positive electrode powder A and positive electrode powder B, add 0.003mol / L calcium hydroxide solution according ...

Embodiment 2

[0051] The method for the safe recovery of lithium-ion battery waste pole pieces of the present embodiment comprises the following specific steps:

[0052] (1) Crushing the waste positive electrode sheet, passing through a screen with a pore size of 0.3 mm, to obtain positive electrode powder A and crushed aluminum slag;

[0053] (2) Mix the crushed aluminum slag with 1mol / L sulfuric acid at a solid-to-liquid ratio of 1:1kg / L, and ultrasonically while stirring, the stirring speed is 500r / min, and the mixing time is 5min, to obtain the crushed aluminum slag after pickling ;

[0054] (3) Adopt wet sieving to sieve the crushed aluminum slag after pickling, take out the sieve from the acid solution, which is mainly aluminum slag, and the sieve is mainly battery powder, and filter the sieve, Take the filter residue and wash the filter residue with water to obtain positive electrode powder B;

[0055] (4) Mix positive electrode powder A and positive electrode powder B, add 0.5mol / ...

Embodiment 3

[0060] The method for the safe recovery of lithium-ion battery waste pole pieces of the present embodiment comprises the following specific steps:

[0061] (1) Crushing and sieving the waste positive electrode sheet to obtain positive electrode powder A and crushed aluminum slag;

[0062] (2) Mix the crushed aluminum slag with 2mol / L sulfuric acid at a solid-to-liquid ratio of 1:0.3kg / L, ultrasonically while stirring, the stirring speed is 500r / min, and the mixing time is 60min to obtain the crushed aluminum after pickling slag;

[0063] (3) Adopt wet sieving to sieve the crushed aluminum slag after pickling, take out the sieve from the acid solution, which is mainly aluminum slag, and the sieve is mainly battery powder, and filter the sieve, Take the filter residue and wash the filter residue with water to obtain positive electrode powder B;

[0064] (4) Mix positive electrode powder A and positive electrode powder B, add 2mol / L potassium hydroxide solution according to the...

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Abstract

The invention belongs to the technical field of battery recovery, and discloses a method for safely recycling a waste pole piece of a lithium ion battery, and application thereof. The method comprises the following steps: crushing and sieving the waste positive plate to obtain positive powder A and crushed aluminum slag; mixing the crushed aluminum slag with an acid solution, performing ultrasonic treatment while stirring, and then performing wet screening to obtain aluminum slag and battery powder; washing the obtained aluminum slag with water, flushing with an explosion suppressant, centrifuging to obtain explosion suppression aluminum slag, and packaging and compressing to obtain an aluminum slag block; and respectively connecting two ends of the aluminum slag block with a positive plate and a negative plate of a direct-current electrode, applying current to melt the aluminum slag, and cooling to obtain the safe aluminum slag block. The residual acid reacts with the saturated calcium hydroxide solution through water washing with the saturated calcium hydroxide solution, the residual acid in the aluminum slag production process is neutralized, the reaction of the aluminum slag and the residual acid is avoided, hydrogen release and heat production are avoided, and the safety of the storage process is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of battery recycling, and in particular relates to a method for safely recycling waste pole pieces of lithium-ion batteries and its application. Background technique [0002] In the manufacturing process of lithium-ion batteries, a certain amount of waste pole pieces will be produced in the pole piece production process. In the case of large-scale production and manufacture of lithium-ion batteries, a large number of waste pole pieces will be produced. Waste pole pieces contain a large amount of metal elements such as nickel, cobalt, manganese, lithium, etc. If they are not recycled, they will pollute the environment. [0003] The traditional waste pole piece recycling process is to separate the aluminum slag and battery powder after the pole piece is broken, the aluminum slag will be washed with acid, and the metal aluminum will be separated again. Since there will be acid and water left after the aluminu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84H01M10/0525C22B1/24C22B7/007C22B7/00C22B21/06H01M10/00B09B3/00
Inventor 谢英豪余海军李长东刘述敏
Owner GUANGDONG BRUNP RECYCLING TECH
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