High efficient stripping method of current collector in lithium battery recycling

A technology for waste lithium batteries and current collectors, which is applied in the field of physical separation of waste lithium batteries, can solve the problems of low stripping efficiency of current collectors, poor stripping effects, and high stripping efficiency, and achieve improved disassembly efficiency, low cost, and high efficiency. The effect of efficiency recovery

Inactive Publication Date: 2008-07-09
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low efficiency, high cost, and poor stripping effect of current collectors in lithium battery recycling, and propose a method for stripping waste lithium battery collectors

Method used

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  • High efficient stripping method of current collector in lithium battery recycling

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Embodiment 1

[0011] Example 1: 10 kg of waste mobile phone lithium batteries were disassembled and shelled to obtain 2.64 kg of shells and 7.36 kg of battery cores. The battery core is crushed to 1-5 mm, heat treated at 450° C. for 2 hours, and the powder after heat treatment is sieved through 80 mesh vibration. The lithium cobalt oxide powder under the sieve is washed with 4% NaOH solution to remove a small amount of aluminum oxide, filtered and washed, and then sent to the leaching process for leaching. Dissolve the copper and aluminum flakes on the sieve with 3% solution, adjust the pH value to 8-9 with ammonium bicarbonate, precipitate white aluminum hydroxide, filter, wash and dry to obtain 1.47kg of aluminum hydroxide, and the recovery rate of aluminum is about 87.4%. 1-5 mm copper flakes are obtained from the filter residue after filtration, and 0.92 kg of high-quality red copper is obtained after melting into an ingot, and the copper recovery rate is 98.6%. A small amount of lithi...

Embodiment 2

[0012] Example 2: 1 ton of waste lithium-ion battery, the battery core is crushed to 1-5mm, heat treated at 250°C for 7 hours, and the powder after heat treatment is passed through 30-mesh vibrating sieve. The lithium cobalt oxide powder under the sieve is washed with 4% alkaline solution to remove a small amount of aluminum oxide, filtered and washed, and then sent to the leaching process for leaching. Dissolve the copper and aluminum flakes on the sieve with 4% alkaline solution, filter, adjust the pH value of the filtrate to 8-9 with ammonium bicarbonate, precipitate, filter, wash, and dry to obtain aluminum hydroxide; the filter residue is copper flakes of 1-5mm , After melting into ingots, high-quality red copper is obtained. A small amount of lithium cobalt oxide entrained by the copper sheet will go to the slag, and the slag will return to leaching to extract cobalt and lithium.

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Abstract

The invention discloses a high-efficient stripping method for recycling a current collector of a waste lithium battery. An electrical core of the waste lithium battery is mechanically crushed to 1 - 5mm and is treated with thermal treatment at 150 - 600 DEG C, powder material after the thermal treatment is treated with vibration screening, the part below the screen is lithium acid cobalt and carbon powder, and the part above the screen is a copper sheet and an aluminum sheet. The invention can realize the streamlined mechanical automated operation of the stripping procedure of the current collector and the positive and negative power materials; the labor intensity of the physical separation of the waste lithium battery can be reduced by at least 50 percent, the separation efficiency can be improved by 40 - 50 percent; and the invention can lay the foundation for the large-scale recycling of the waste lithium batteries.

Description

technical field [0001] The invention relates to the recovery and comprehensive utilization of waste batteries, in particular to the physical disassembly of waste lithium batteries. Background technique [0002] With the popularization of mobile communications, laptop computers, digital cameras, digital video cameras and other small electric tools, my country has become a major producer and consumer of lithium-ion batteries in the world. At present, the output of lithium-ion batteries in my country has reached nearly 1 billion, and the per capita battery consumption is about 0.6 batteries per year, exceeding 1 / 5 of the world's total, ranking first in the world. Huge battery consumption has brought a staggering number of waste batteries, but the current recycling rate in my country is less than 2%. A large number of used batteries are discarded, and a considerable part of them is directly mixed into the garbage. This is not only a waste of resources, but also pollutes the env...

Claims

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Application Information

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IPC IPC(8): H01M10/54H01M6/52B09B3/00
CPCY02W30/84
Inventor 唐新村罗卓
Owner CENT SOUTH UNIV
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