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Method for recovering copper foil and graphene from waste lithium ion battery negative electrode material

A lithium-ion battery and negative electrode material technology, applied in the field of recycling, can solve the problems of complex graphite extraction and purification process, inability to completely separate copper foil and graphite, long soaking time, etc., and achieve easy large-scale industrial production, The effect of low recycling cost and short process

Inactive Publication Date: 2017-11-03
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual operation, it was found that this method requires a long soaking time due to the low concentration of the acid solution for soaking the anode material of the waste lithium-ion battery, the copper foil and the graphite cannot be completely separated, and the subsequent graphite extraction and purification process is complex and costly. higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Soak the waste lithium-ion battery in 6% sodium chloride solution for 24 hours to discharge and manually disassemble to obtain 100g of negative electrode material, and then cut it manually to obtain a 5cm×10cm negative electrode sheet; prepare 500mL of 1 mol / L sulfuric acid solution, place in In a 3L beaker, heat up the water bath to 40°C, put the cut negative electrode sheet and soak for 3 minutes to completely separate the copper foil from the graphite; remove the copper foil and rinse it twice with water, and dry it naturally to obtain a 5cm×10cm copper foil; The graphite-containing solution is filtered with a Bush funnel, and the filter residue is washed, dried, and sieved to obtain graphite, and the filtrate with a certain acidity is recovered for future use.

Embodiment 2

[0020] Soak the waste lithium-ion battery in 2% sodium chloride solution for 36 hours to discharge and manually disassemble to obtain 1Kg of negative electrode material, and then cut it manually to obtain a 5cm×8cm negative electrode sheet; prepare 2L of 2 mol / L sulfuric acid solution, place in In a 5L beaker, heat the water bath to 50°C, put the cut negative electrode sheet and soak for 1.5min to completely separate the copper foil from the graphite; take out the copper foil and rinse it twice with water, and dry it naturally to obtain a 5cm×8cm copper foil The graphite-containing solution is filtered with a Bush funnel, and the filter residue is washed, dried, and sieved to obtain graphite, and the filtrate with a certain acidity is recovered for subsequent use.

Embodiment 3

[0022] Place the waste lithium-ion battery in 0.6% sodium chloride solution and soak for 48h to discharge and manually disassemble to obtain 2Kg of negative electrode material, then manually cut to obtain a negative electrode sheet of 5cm * 8cm; the filtrate of embodiment 1 and embodiment 2 were combined 2.5L, put it in a 5L beaker, add concentrated sulfuric acid to make the acid concentration of the filtrate reach 2mol / L, heat up the water bath to 60°C, put the cut negative electrode piece and soak for 2min, so that the copper foil and graphite are completely separated; Rinse the foil twice with water and dry naturally to obtain a 5cm×8cm copper foil; filter the graphite-containing solution with a Bush funnel, wash the filter residue, dry it, and sieve it to obtain graphite.

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Abstract

The invention discloses a method for recovering a copper foil and graphene from a waste lithium ion battery negative electrode material, and belongs to the technical field of recovery of an electrode material. The method comprises the steps of discharging, manually disassembling and cutting a waste lithium ion battery to obtain a negative pole plate, and placing the waste lithium ion battery in 1.0-3.0mol.L sulfuric acid solution with a temperature of 30-60 DEG C for immersion for 1-3 minutes so that the copper foil and the graphene are completely separated; bailing the copper foil, washing the copper foil with water, and drying the copper foil to obtain a copper foil product; and filtering a graphite-containing solution with a buchner funnel, and washing, drying and sieving filtering residue to obtain the graphite, wherein a filtering liquid with a certain concentration is used as an acid solution for immersing the negative pole plate in a circulation way. By the method, the problem that the copper foil and the graphite cannot be efficiently and thoroughly separated during recovery of the waste lithium ion battery negative electrode material is solved, and the obtained copper foil product is high in purity and can be directly utilized; and the method has the advantages of simple process, short flow and low cost, and is friendly to an environment, industrial production on a large scale is easy, and no secondary pollution is generated during the recovery process.

Description

technical field [0001] The invention belongs to the technical field of recycling electrode materials, and relates to a method for recycling copper foil and graphite from waste lithium ion battery negative electrode materials. Background technique [0002] Lithium-ion battery is the rechargeable chemical battery with the best technical performance in the world. It has the advantages of high working voltage, large specific energy, long cycle life, small self-discharge, no memory effect, and no pollution. It is widely used in mobile communications, notebooks, etc. Computers, portable tools, electric bicycles, electric vehicles and other fields. However, the widespread use is bound to be accompanied by the generation of a large number of waste lithium-ion batteries. If these waste lithium-ion batteries are discarded at will, it will not only pollute the environment, but also cause a serious waste of resources. Therefore, the recycling of waste lithium-ion batteries and their wa...

Claims

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Application Information

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IPC IPC(8): H01M10/054C22B7/00
CPCC22B7/007H01M10/054Y02E60/10Y02P10/20
Inventor 常全忠李兰兰王甲琴马骞柴艮风甘梅陈天翼常雪洁王红忠
Owner JINCHUAN GROUP LIMITED
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