Recycling method of positive electrode piece of lithium ion battery

A lithium-ion battery and positive electrode technology, which is applied in the field of lithium-ion battery positive electrode recycling, to achieve good structure and electrochemical characteristics, improve purity, and save costs

Inactive Publication Date: 2016-05-11
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to provide a practical and effective method for the recycling of lithium-ion battery positive plates, and solve the problem of recycling nickel-cobalt manganese (aluminum) acid lithium positive plates and lithium cobalt oxide positive plates produced in the production process of lithium-ion batteries

Method used

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  • Recycling method of positive electrode piece of lithium ion battery

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1 (best embodiment)

[0025] Taking nickel-cobalt lithium manganese oxide (523 type) positive electrode sheet as an example, the recycling steps are as follows.

[0026] 1. Pole piece sorting and crushing: the pole piece is cut and broken, and the size of the pole piece is controlled at 1-10cm 2 .

[0027] 2. Organic solvent immersion: The broken pole pieces are soaked in organic solvent for 2 hours.

[0028] 3. Stirring treatment: First, carry out low-speed mechanical stirring on the soaked mixture for 1 hour, and the stirring speed is 15r / min. Ultrasonic stirring is then carried out, and the ultrasonic frequency range is 20KHz-35KHz, so that the two stirring methods are carried out at the same time, and the stirring time is 2h.

[0029] 4. Sieve filtration: the mixture of aluminum flakes and powder particles is separated by sieve filtration, and the sieve aperture is controlled at 0.4cm 2 , the aluminum sheet on the sieve is cleaned and filtered with ab...

Embodiment 2

[0039] Taking nickel-cobalt lithium manganese oxide (523 type) positive electrode sheet as an example, the recycling steps are as follows.

[0040] 1. Pole piece sorting and crushing: the pole piece is cut and broken, and the size of the pole piece is controlled at 1-10cm 2 .

[0041] 2. Organic solvent immersion: The broken pole pieces are soaked in organic solvent for 8 hours.

[0042] 3. Stirring treatment: First, carry out low-speed mechanical stirring on the soaked mixture for 1.5 hours, and the stirring speed is 50r / min. Ultrasonic stirring is then carried out, and the ultrasonic frequency range is 20KHz-35KHz, so that the two stirring methods are carried out at the same time, and the stirring time is 2h.

[0043] 4. Sieve filtration: the mixture of aluminum flakes and powder particles is separated by sieve filtration, and the sieve aperture is controlled at 0.6cm 2 , the aluminum sheet on the sieve is cleaned and filtered with absolute ethanol, and the number of times ...

Embodiment 3

[0051] Taking nickel-cobalt lithium manganese oxide (523 type) positive electrode sheet as an example, the recycling steps are as follows.

[0052] 1. Pole piece sorting and crushing: the pole piece is cut and broken, and the size of the pole piece is controlled at 1-10cm 2 .

[0053] 2. Organic solvent immersion: The broken pole pieces are soaked in organic solvent for 2 hours.

[0054] 3. Stirring treatment: First, carry out low-speed mechanical stirring on the mixture after soaking for 1 hour, and the stirring speed is 10r / min. Ultrasonic stirring is then carried out, and the ultrasonic frequency range is 20KHz-35KHz, so that the two stirring methods are carried out at the same time, and the stirring time is 1h.

[0055] 4. Sieve filtration: the mixture of aluminum flakes and powder particles is separated by sieve filtration, and the sieve aperture is controlled at 0.2cm 2 , the aluminum sheet on the sieve is cleaned and filtered with absolute ethanol, and the number of ...

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Abstract

The invention discloses a recycling method of a positive electrode piece of a lithium ion battery, aiming at solving the problem of recycling of a nickel cobalt lithium manganite (nickel cobalt lithium aluminate) positive electrode piece and a lithium cobaltate positive electrode piece generated in a production process of the lithium ion battery. According to the technical scheme disclosed by the invention, the recycling method comprises the following steps: 1, crushing the electrode pieces by classes; 2, immersing with an organic solvent; 3, carrying out stirring treatment; 4, filtering with a sieve net; 5, carrying out centrifugal separation; 6, immersing with an alkaline solution; 7, carrying out the centrifugal separation again; 8, drying and removing iron; 9, carrying out ICP (Inductively Coupled Plasma) analysis; and 10, calcining the materials. The recycling method disclosed by the invention can be used for effectively recycling waste materials of the positive electrode pieces of the waste lithium ion batteries, so that the cost is saved; and by immersing with the alkaline solution and carrying out a plurality of times of separation and washing, impurities, such as metal aluminum, in powder grains can be effectively removed. With the adoption of the recycling method, a positive electrode material and an aluminum foil can be completely separated, and the positive electrode material keeps a relatively good structure and electrochemical properties; and the synthesis of a precursor is not needed and the adding amount of a lithium salt is relatively less.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a method for recycling positive plates of lithium ion batteries. Background technique [0002] Due to the advantages of high energy density, small self-discharge, and excellent cycle performance, lithium-ion batteries are widely used in backup power supplies, energy storage devices, electric vehicles, electric bicycles, and power tools. Lithium-ion batteries are divided into lithium iron phosphate batteries, lithium nickel cobalt manganese (aluminum) acid ternary material batteries, lithium cobalt oxide batteries, and lithium manganese oxide batteries according to the positive electrode material. Among them, the ternary materials can be divided into 111, 424, 523, 622, 811 and other different models according to the different proportions of nickel, cobalt, and manganese (aluminum). [0003] In the battery production process, a certain proportion of scrap sheets will be p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54B09B3/00
CPCH01M10/54B09B3/80Y02W30/84
Inventor 关成善宗继月李涛张敬捧王勇梅庆虎
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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