Recycling method for waste lithium ion battery negative electrode material

A technology of a lithium ion battery and a recycling method, which is applied in the field of recycling negative electrode materials of waste lithium ion batteries, can solve the problems of low recycling purity, secondary pollution, non-recyclable solvent, etc., and achieves the effect of simple operation and high purity

Active Publication Date: 2018-04-06
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0007] In view of the deficiencies in the prior art, in order to solve the problems of low recovery purity of waste lithium-ion battery negative electrode materials, secondary pollution during the recovery process, and non-recyclable solvents, one of the purposes of the present invention is to provide a waste lithium-ion battery negative electrode material. Recovery method, described method comprises the steps:

Method used

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  • Recycling method for waste lithium ion battery negative electrode material

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Embodiment 1

[0059] (1) Take 10 g of the waste carbon material negative electrode and 100 mL of the separating agent (3mol / L formic acid), mix them, and stir at 120 r / min for 60 min at 35±2°C to obtain a mixture containing carbon powder and copper foil;

[0060] (2) Sieve with a vibrating sieve, rinse the vibrating sieve with deionized water, obtain a suspension containing carbon powder and copper foil, clean the copper foil with deionized water for 3 times, obtain 3.70 g of copper foil with a purity of 99.9%, and wash the liquid mixed with a suspension containing toner;

[0061] (3) Use 0.45 micron filter paper to filter the mixed solution of the flushing liquid and the suspension containing carbon powder to obtain 5.24g of carbon powder and 97mL of separating agent. acid+0.3mol / L sodium thiosulfate) 60mL mixed, stirred to obtain a suspension containing carbon powder, then filtered to obtain carbon powder and leaching agent; carbon powder was washed 3 times with 300mL deionized water, dri...

Embodiment 2

[0067] (1) Take 1 kg of waste carbon material negative electrode and 5 L of separating agent (2mol / L acetic acid) and mix them, and ultrasonicate for 20 minutes at 30±2°C to obtain a mixture containing carbon powder and copper foil;

[0068] (2) Sieve with a vibrating sieve, rinse the vibrating sieve with deionized water, obtain suspension and copper foil containing carbon powder, clean the copper foil with deionized water 3 times, obtain 320g of copper foil with a purity of 99.9%, rinse liquid and Mixing of suspensions containing carbon powder;

[0069] (3) Filter with a 300-mesh sieve to obtain 662 g of carbon powder and 4.82 L of separating agent, mix 662 g of carbon powder with 1 L of leaching agent (50% 4mol / L isobutyric acid + 10% hydrogen peroxide), and stir to obtain a suspension containing carbon powder liquid, then filtered to obtain carbon powder and leaching agent; the carbon powder was washed 3 times with deionized water, and dried to obtain 641g, 99.999% high-pur...

Embodiment 3

[0074] (1) Take 100g of waste carbon material negative electrode, mix 0.5L of separating agent (2mol / L propionic acid), and stir at 200r / min for 50min at 25±2°C to obtain a mixture containing carbon powder and copper foil;

[0075] (2) Sieve with a vibrating sieve, rinse the vibrating sieve with deionized water, obtain a suspension containing carbon powder and copper foil, clean the copper foil with deionized water for 3 times, obtain 37.9 g of copper foil with a purity of 99.9%, and wash the liquid mixed with a suspension containing toner;

[0076] (3) Filtrate with 0.45 micron filter paper to obtain 61.0g of carbon powder and 470mL of separating agent, mix 61.0g of carbon powder with 1.2L of leaching agent (3mol / L acetic acid+0.5mol / L sodium sulfite), and stir at 150r / min to obtain The suspension of carbon powder is then filtered to obtain carbon powder and leaching agent; the carbon powder is cleaned 3 times with deionized water and dried to obtain 55.8g, 99.998% high-purit...

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Abstract

The invention relates to a recycling method for a waste lithium ion battery negative electrode material. The recycling method comprises the following steps: (1) mixing a waste lithium ion battery negative electrode piece with a separation agent, so as to obtain a mixture of a copper foil and a stripped negative electrode carbon material; (2) separating the copper foil from the negative electrode carbon material, so as to obtain the copper foil and suspension liquid containing negative electrode carbon material, and separating the suspension liquid and drying, so as to obtain primary carbon powder and a separation agent solution; (3) further mixing the primary carbon powder obtained in the step (2) with a leaching agent so as to obtain mixed liquid, filtering the mixed liquid, and cleaningand drying filter residues so as to obtain purified carbon powder and a leaching solution; and (4) roasting the purified carbon powder obtained in the step (3), so as to obtain high-purity graphite. Apreparation method is simple, the recycling process is free from pollution, the recycling cost is low, the industrial production is easy, the purity of the purified copper foil is 99.9% or above, andthe purify of the prepared graphite is 99.9% or above.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery recycling, and in particular relates to a method for recycling anode materials of waste lithium ion batteries. Background technique [0002] Chemical power sources have been more and more widely used in the industry, forming a dominant monopoly in the field of mobile phones and communications, and have also attracted widespread attention in the field of new energy vehicles, especially hybrid vehicles and pure electric vehicles dominated by lithium-ion batteries. Automobiles have already appeared, and graphite has become an irreplaceable active substance or additive in chemical power sources due to its good electrical conductivity and large specific surface area. Especially in the whole life cycle of lithium-ion batteries, it is inevitable to produce a large amount of production waste, defective products and waste products, as well as obsolete battery products brought about by the upgra...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 孙峙郑晓洪王瑛林晓曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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