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Method for repairing and regenerating graphite negative electrode waste

A graphite anode, repair and regeneration technology, applied in chemical instruments and methods, battery electrodes, electrochemical generators, etc., can solve the problems of graphite anode waste that cannot be directly reused, has not been recycled, and has no repair methods.

Inactive Publication Date: 2018-05-29
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Graphite anode waste is not yet subject to recycling as it cannot be directly reused and there is no proven repair method

Method used

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  • Method for repairing and regenerating graphite negative electrode waste
  • Method for repairing and regenerating graphite negative electrode waste
  • Method for repairing and regenerating graphite negative electrode waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Take 1.0Kg and put the natural graphite negative electrode waste recovered from scrap batteries into a muffle furnace, calcinate at 300°C for 0.5h in an air atmosphere, remove the conductive agent, binder, and thickener, and obtain a calcined product of 0.97 Kg;

[0038] Take 500g of the calcined product and put it into a 5L beaker, add 2L of water, add 80mL of hydrogen peroxide and 640mL of hydrochloric acid mixed solution at a stirring speed of 200 rpm, the pH value of the mixed solution is 1, soak for 1 hour, then filter and wash To neutral, dry at 100°C to obtain purified graphite. The graphite after the sieving is poured into the ethanol that is dissolved with phenolic resin, so that the coating amount of phenolic resin is 3wt.%, stir 5h under the rotating speed of 250 rev / mins, make phenolic resin particle adsorb on graphite particle surface, Suction filtration and drying to obtain graphite particles with phenolic resin adsorbed on the surface; put the above-ment...

Embodiment 2

[0041] Take 1.0Kg and put the natural graphite negative electrode waste recovered from scrap batteries into a muffle furnace, calcinate at 500°C for 1h in an air atmosphere, remove the conductive agent, binder and thickener, and obtain 0.96Kg of calcined product ;

[0042] Take 500g of the calcined product and put it into a 5L beaker, add 2L of water, add 80mL of hydrogen peroxide and 300mL of sulfuric acid mixed solution at a stirring speed of 200 rpm, the pH value of the mixed solution is 1.4, soak for 3 hours, then filter and wash To neutral, dry at 100°C to obtain purified graphite. The graphite after sieving is poured into the ethanol that is dissolved with phenolic resin, so that the coating amount of phenolic resin is 5wt.%, stir 5h under the rotating speed of 250 rev / mins, make phenolic resin particle adsorb on graphite particle surface, Suction filtration and drying to obtain graphite particles with phenolic resin adsorbed on the surface; put the above-mentioned grap...

Embodiment 3

[0045] Take 1.0Kg and put the natural graphite negative electrode waste recovered from scrap batteries into a muffle furnace, and calcinate in an air atmosphere at 600°C for 1.5h, remove the conductive agent, binder, and thickener, and obtain a calcined product of 0.97 Kg;

[0046] Take 500g of the calcined product and put it into a 5L beaker, add 2L of water, add 80mL of hydrogen peroxide and 240mL of sulfuric acid mixed solution at a stirring speed of 200 rpm, the pH value of the mixed solution is 2, soak for 3 hours, then filter and wash To neutral, dry at 100°C to obtain purified graphite. The graphite after the sieving is poured into the ethanol that is dissolved with phenolic resin, so that the coating amount of phenolic resin is 7wt.%, stir 5h under the rotating speed of 250 rev / mins, make phenolic resin particle adsorb on graphite particle surface, Suction filtration and drying to obtain graphite particles with phenolic resin adsorbed on the surface; put the above gra...

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Abstract

The invention provides a method for repairing and regenerating graphite negative electrode waste. The method comprises 1) calcining graphite negative electrode waste recovered from scrapped batteriesin air, 2) soaking the calcined waste in an inorganic acid solution with oxidizing properties, and carrying out filtration, cleaning, drying, ball milling and screening to obtain initially purified graphite, and 3) pouring the screened waste into an ethanol solution of phenolic resin, carrying out stirring, suction filtration and drying to obtain pretreated coated graphite negative electrode material, carrying curing and high-temperature heat treatment on the coated graphite negative electrode material in an inert atmosphere to repair graphite powder and carrying out ball milling and screening to obtain modified graphite for a battery electrode. After the graphite waste repair and regeneration, the tap density and electrochemical performances can satisfy the reuse requirements.

Description

technical field [0001] The invention belongs to the technical field of recovery and treatment of waste lithium-ion batteries, in particular to a method for repairing and regenerating graphite waste. Background technique [0002] At present, my country's pure electric vehicles are showing explosive growth. The power batteries of these electric vehicles will be retired after about 5-7 years. Therefore, in the future, they will face a large number of retired power batteries. Well, not only will it pollute the environment, but it will also cause a waste of resources. Reusing these decommissioned power batteries must be the first consideration, but for those end-of-life batteries that cannot be reutilized or have been reutilized, dismantling and recycling valuable materials is the only option. [0003] Under the influence of multiple factors such as policies, interests, and social responsibilities, more and more companies have begun to deploy power battery recycling. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205C01B32/215H01M4/587H01M10/0525
CPCH01M4/587H01M10/0525Y02E60/10
Inventor 宋继顺张晋宋大卫张联齐
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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