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Recycling method for disqualified lithium ion battery negative electrode materials in graphite system

A lithium-ion battery and anode material technology, applied in the field of anode material recycling, can solve problems such as ignoring the importance of efficient recycling of graphite raw materials, achieve high added value of products, simple process flow, and reduce environmental pollution.

Active Publication Date: 2014-12-24
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to turn the recovered anode resources from waste into treasure, the predecessors have carried out a lot of exploration and research, but they have focused on the improvement of the graphite purification process for the current anode material reuse, but they have ignored graphite. The importance of efficient recycling of raw materials

Method used

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  • Recycling method for disqualified lithium ion battery negative electrode materials in graphite system
  • Recycling method for disqualified lithium ion battery negative electrode materials in graphite system
  • Recycling method for disqualified lithium ion battery negative electrode materials in graphite system

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Negative pole pieces refer to unqualified lithium ion negative pole pieces using graphite system.

[0045] Put 3kg of unqualified lithium-ion battery negative electrodes into a sieve drum with a length of 70cm and a diameter of 30cm, and then soak it into a 100L drum container filled with 0.1mol / L sodium pyrophosphate solvent for 20 minutes. Take out the sieve cylinder and connect it to the output shaft of the motor on the operating table of the small hoist, then drive the lifting device to lower the sieve cylinder into the 100L container containing the aqueous solution, the motor drives the sieve cylinder to rotate, and the lifting device drives the sieve cylinder to operate Reciprocating motion in the vertical direction, the working time is 20 minutes, under the synergistic effect of mechanical motion and water flow shearing and scouring, the graphite is completely separated from the copper foil, flows out and settles to the bottom of the container through the sieve ho...

Embodiment 2

[0050] Put 3.5kg of unqualified negative pole pieces of lithium-ion batteries into a sieve cylinder with a length of 80cm and a diameter of 40cm, and then soak them in a 100L drum container filled with 0.15mol / L sodium pyrophosphate solvent for 15min . Take out the sieve cylinder and connect it to the output shaft of the motor on the operating table of the small hoist, then drive the lifting device to lower the sieve cylinder into the 100L container containing the aqueous solution, the motor drives the sieve cylinder to rotate, and the lifting device drives the sieve cylinder to operate Reciprocating motion in the vertical direction, the working time is 20 minutes, under the synergistic effect of mechanical motion and water flow shearing, the graphite flakes are completely separated from the copper foil, and settle down to the container through the sieve holes with a diameter of 2 cm on the surface of the sieve cylinder At the bottom, it is pumped to the centrifuge by the slur...

Embodiment 3

[0055]Put 4kg of unqualified lithium-ion battery negative electrodes into a sieve cylinder with a length of 90cm and a diameter of 50cm, and then soak it into a 100L drum container filled with 0.25mol / L sodium pyrophosphate solvent for 10 minutes. Take out the screen cylinder and connect it to the operating table of the small elevator machine, then lower the screen cylinder into the 100L container containing the aqueous solution for vertical reciprocating motion, the working time is 20min, under the synergistic effect of mechanical movement and water scouring Next, the graphite flakes are completely separated from the copper foil, settle down to the bottom of the container through the sieve holes with a diameter of Φ2cm on the surface of the sieve cylinder, and then are pumped by the slurry pump to the centrifuge for washing, filtering and drying, and finally get a water content of 20 -30% graphite slag; the current collector in the pole piece still remains in the sieve drum, a...

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Abstract

The invention discloses a recycling method for disqualified lithium ion battery negative electrode materials in a graphite system. The recycling method comprises the following steps that (1) a pole piece of the negative electrode in a disqualified lithium ion battery is put into a separation solvent, a thickening agent between a graphite sheet and a current collector is dissolved, and then the graphite sheet is not firmly attached onto the current collector; (2) graphite and the current collector processed in the step (1) are sieved, and graphite slag is obtained; (3) the graphite slag is subjected to oxidation reaction treatment, metal impurities in the graphite slag are removed, and graphite slurry which is primarily purified is obtained; (4) the graphite slurry is placed in a muffle furnace at 650-700 DEG C and keeps the temperature for 1-2h, impurities in the graphite slurry are removed, and high-purity graphite powder is obtained; and (5) graphite is subjected to surface modification, and graphite powder for electrodes of the battery is obtained. The method can be used for efficiently recycling graphite in negative electrode materials and realizing graphite recovery and cyclic regeneration.

Description

technical field [0001] The invention belongs to a method for recycling negative electrode materials in batteries, and in particular relates to a method for recycling negative electrode materials in unqualified lithium ion batteries of graphite system. Background technique [0002] As a good electric energy carrier, lithium-ion secondary batteries are widely used in electronic products, electric vehicles, aerospace and other fields because of their high voltage, large specific capacity, good cycle performance, and no memory effect. One of the best options for transitioning from traditional fossil fuels to clean, environmentally friendly and renewable energy. In recent years, with the rapid development of the global lithium-ion battery industry, its production capacity has increased year by year. According to statistics from the National Bureau of Statistics, the total output of lithium-ion batteries in China in 2013 was about 4.768 billion, a year-on-year increase of 16.9%. ...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 周顺周汉章谭静进梁凯黎碧蓝
Owner GUANGDONG BRUNP RECYCLING TECH
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