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Method for efficiently recovering active materials of positive poles in waste lithium batteries

A technology for positive active materials and waste lithium batteries, which is applied in the field of separation and recycling of electrolyte, separator, copper foil, positive active material, battery case, and aluminum foil, which can solve the problems of large environmental pollution, low separation efficiency, and high processing cost. Achieve high separation efficiency, simple process, and solve the effect of high energy consumption

Inactive Publication Date: 2011-03-23
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the defects of low separation efficiency, high follow-up treatment cost, and large environmental pollution in the prior art of lithium ion battery positive active materials, and propose a simple and efficient method for recovering lithium ion positive active materials, which can realize Assembly line mechanical automation

Method used

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  • Method for efficiently recovering active materials of positive poles in waste lithium batteries

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Effect test

Embodiment 1

[0038] Weigh 500g of broken cell fragments, crush them to 1-5mm, stir in hot water at 80°C for 1 hour, filter and dry, pass through an 80-mesh vibrating sieve, collect the powder material under the sieve, and magnetically separate the part on the sieve After removing iron, use 3% NaOH solution with a mass percentage concentration of 1:10 g / ml according to the solid-to-liquid ratio, stir at 80 ° C for 3 hours, and filter the filtrate after the aluminum foil is completely dissolved. Use 0.2 mol / L dilute sulfuric acid to adjust the pH value to 12 , and then use saturated ammonium bicarbonate to adjust the pH value to 9.5 and age for 1 hour, filter, the aluminum precipitation is complete and the filtration performance is good, the filter residue is dried and passed through an 80-mesh vibrating sieve to collect the powder material under the sieve. The part above the sieve is placed in water for water spinning, and after the upper plastic diaphragm is poured off, the copper sheet is ...

Embodiment 2

[0040] Weigh 500g of broken cell fragments, crush them to 1-5mm, stir in hot water at 80°C for 2 hours, filter and dry, pass through an 80-mesh vibrating sieve, collect the powder material under the sieve, and magnetically separate the part on the sieve After iron removal, use 3% NaOH solution with a mass percentage concentration of 1:10 g / ml according to the solid-to-liquid ratio, and stir for 5 hours at about 80°C. After the aluminum foil is completely dissolved, filter it, and adjust the pH of the filtrate with 0.2mol / L dilute sulfuric acid. The value is 12, and then adjust the pH value to 8.5 with saturated ammonium bicarbonate to age for 1 hour, filter, and the aluminum precipitation is complete and the filter performance is good. After the filter residue is dried, pass through an 80-mesh vibrating sieve to collect the powder material under the sieve. The part above the sieve is placed in water for water spinning, and after the upper plastic diaphragm is poured off, the c...

Embodiment 3

[0042] Weigh 500g of broken cell fragments, crush them to 1-5mm, stir in hot water at 90°C for 2 hours, filter and dry, pass through an 80-mesh vibrating sieve, collect the powder material under the sieve, and magnetically separate the part on the sieve After removing iron, use 5% NaOH solution with a mass percentage concentration of 1:6g / ml according to the solid-to-liquid ratio, and stir for 5 hours at about 60°C. After the aluminum foil is completely dissolved, filter it, and adjust the pH of the filtrate with 0.5mol / L dilute sulfuric acid. The value is 12, and then adjust the pH value to 8.5 with saturated ammonium bicarbonate to age for 2 hours, filter, and the aluminum precipitation is complete and the filtration performance is good. After the filter residue is dried, pass through an 80-mesh vibrating sieve to collect the powder material under the sieve. The part above the sieve is placed in water for water spinning, and after the upper plastic diaphragm is poured off, t...

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Abstract

The invention discloses a method for efficiently recovering active materials of positive poles in waste lithium batteries, which is mainly characterized by adding crushed electrical core fragments into hot water, stirring the mixture, and performing first vibration screening after the filtration and drying to separate most of an active material; dissolving aluminum foil through alkaline leaching after an oversize part is magnetically separated, adjusting the pH value of an alkaline leaching filtrate by dilute acid and ammonium bicarbonate solution, and recovering aluminum; performing second vibration screening after the filtration and drying to separate a residual powder material; and placing the oversize part into water for water cyclone separation, dumping to remove an upper-layer plastic diaphragm, then using dilute sulfuric acid and sodium thiosulfate solution to wash a copper sheet to ensure that carbon powder and active powder which are adhered to the copper sheet are loosened and fall off, making the powder float on an upper layer through cyclone separation after the washing, mixing the powder and the active powders obtained by two screenings, using NaOH solution to soak the mixture after the magnetic separation, calcining the alkali-leached active powder material after the filtration and drying, and taking the active powder material as active powder for subsequent treatment. The use of the method can ensure that the recovery rates of copper and aluminum in waste lithium ion batteries reach 98.5 percent and 97 percent respectively, and the recovery rate of the active materials is about 99 percent.

Description

technical field [0001] The present invention relates to the comprehensive recovery of valuable components in waste lithium batteries, and in particular to an efficient separation and recovery method for positive electrode active materials, battery shells, diaphragms, electrolytes, copper foils and aluminum foils in waste lithium batteries. Background technique [0002] Since the commercialization of lithium-ion batteries in 1990, they have been widely used in portable electronic devices such as mobile phones, notebook computers and cameras due to their advantages such as high energy density, light weight, long life and no memory. It is hoped that in the future, batteries such as lead-acid, nickel-cadmium, and nickel-metal hydride will also be replaced as the power source of electric vehicles. At that time, the usage of lithium-ion batteries will increase exponentially. According to statistics, in 2000, the global production of lithium-ion batteries exceeded 580 million, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B7/00C22B15/00C22B21/00
CPCY02E60/12Y02P10/20Y02W30/84
Inventor 唐新村陈亮张阳曾智文李连兴肖源化王志敏瞿毅
Owner CENT SOUTH UNIV
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