Pretreatment method for recovering valuable metal from anode material of waste lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of efficient recovery and pretreatment of valuable metals in waste lithium-ion battery positive electrode materials, can solve the problems of complicated separation and recovery, difficult separation, high price, etc. Effects of cost reduction and temperature reduction

Inactive Publication Date: 2011-02-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical separation process crushes and screens the waste batteries through mechanical stirring, which complicates the separation and recovery; the ordinary heat treatment process needs to pulverize the positive electrode materials obtained by dismantling the waste batteries, and put them in an electric furnace to remove the positive electrodes by roasting at atmospheric pressure and high temperature The organic electrolyte, organic binder and conductive carbon black of the material are used to obtain metal oxide slag containing cobalt, lithium and aluminum. This process not only loses a large amount of organic matter and conductive carbon black in the positive electrode material, but is easy to use due to high temperature and normal pressure treatment. The aluminum foil is melted and oxidized into fine white particles, which are mixed with the positive electrode active material and are difficult to separate. Lithium cobaltate is also easily oxidized into Co 3 o 4 , both make it difficult to leach cobalt and lithium, and this process requires high gas purification and recovery equipment and consumes a lot of energy
The process of physically dissolving spent lithium battery cathode materials generally uses expensive N-methylpyrrolidone (NMP), and is not suitable for large-scale production

Method used

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  • Pretreatment method for recovering valuable metal from anode material of waste lithium ion battery
  • Pretreatment method for recovering valuable metal from anode material of waste lithium ion battery
  • Pretreatment method for recovering valuable metal from anode material of waste lithium ion battery

Examples

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Effect test

Embodiment 1

[0031] Take a piece of used Nokia BL-5B lithium battery manufactured by Sanyo Energy Beijing Co., Ltd., soak it in saturated salt water for 6 hours, until it is fully discharged, disassemble it in a ventilated environment, decompose to obtain 5.32g of positive electrode material, and place it in a vacuum furnace . Heating at a heating rate of 10°C / min to 540-550°C, with a vacuum degree of 80-100Pa, keeping it warm for 0.5h, taking it out after cooling, separating the obtained lithium cobaltate powder and aluminum foil, and grinding the lithium cobaltate powder, the obtained powder is Liquid-solid ratio of 40-50g / L placed at 70-80°C containing 3mol / LH 2 SO 4 With 15~20vol.% H 2 o 2 Leach for 1 hour. During the reaction, soak the separated aluminum foil in the mixed solution for 1 minute, remove it and rinse it with a small amount of water. After the reaction, measure the metal content of the leaching solution by ICP atomic emission spectrometry: cobalt 10.580g / L, lithium 1.1...

Embodiment 2

[0033] Take a piece of used SAMSUNG3.7V lithium battery manufactured by Tianji Samsung Communication Technology Co., Ltd., soak it in saturated salt water for 6 hours, until it is fully discharged, disassemble it in a ventilated environment, and decompose it to obtain 6.41g of positive electrode material, which is placed in a vacuum furnace. Heating at a heating rate of 10°C / min to 540-550°C, with a vacuum degree of 60-80Pa, keeping it warm for 0.5h, taking it out after cooling, separating the obtained lithium cobaltate powder and aluminum foil, grinding the lithium cobaltate powder, and the obtained powder is Liquid-solid ratio of 40-50g / L placed at 70-80°C containing 3mol / LH 2 SO 4 With 15~20vol.% H 2 o 2 Leach for 1 hour. During the reaction, soak the separated aluminum foil in the mixed solution for 1.5 minutes, remove it and rinse it with a small amount of water. After the reaction, measure the metal content of the leach solution by ICP atomic emission spectrometry: cob...

Embodiment 3

[0035]Take a used SAMSUNG 3.7V lithium-ion battery manufactured in Japan and assembled in South Korea, soak it in saturated salt water for 6 hours, until it is fully discharged, disassemble it in a ventilated environment, decompose to obtain 6.78g of positive electrode material, and place it in a vacuum furnace. Heat at a heating rate of 10°C / min to 540-550°C, vacuum degree 40-60Pa, keep warm for 0.5h, take it out after cooling, separate the obtained lithium cobalt oxide powder and aluminum foil, grind the lithium cobalt oxide powder, and obtain the powder With a liquid-solid ratio of 40-50g / L placed at 70-80°C containing 2.5-3mol / LH 2 SO 4 With 15~20vol.% H 2 o 2 Leach for 1 hour. During the reaction, soak the separated aluminum foil in the mixed solution for 2 minutes, remove it and rinse it with a small amount of water. After the reaction, measure the metal content of the leaching solution by ICP atomic emission spectrometry: cobalt 18.910g / L, lithium 2.021g / L, aluminum ...

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Abstract

The invention provides a pretreatment method for recovering valuable metal from the anode material of a waste lithium ion battery, which comprises the following steps: (1) treating an anode piece of the lithium ion battery under a vacuum pyrolysis condition; (2) separating; (3) heating and leaching lithium cobalt oxide slag falling off in a sulfuric acid and hydrogen peroxide system; and (4) soaking separated aluminum foil in a leach solution. The invention is simple, feasible, low in cost and environment friendly, the recovery rates of the valuable metal cobalt and lithium are both above 99%, and the invention is suitable for pretreatment for large-scale recovery of waste lithium ion batteries.

Description

technical field [0001] The invention relates to the field of recovery of valuable metals in waste lithium ion batteries, in particular to a method for efficient recovery and pretreatment of valuable metals in positive electrode materials of waste lithium ion batteries. Background technique [0002] Due to the advantages of high energy density, high working voltage, small self-discharge, no memory effect and long cycle life, lithium-ion batteries have been widely used in mobile electronic digital products such as notebook computers and mobile phones since they were commercialized. At present, my country has become the largest producer, consumer and exporter of lithium-ion batteries. [0003] After hundreds of times of charge and discharge, the lithium-ion battery will swell, the capacity will drop until it is scrapped, and the service life is generally 1 to 3 years. Therefore, a large amount of waste lithium batteries will be generated during the extensive use of lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 丘克强孙亮
Owner CENT SOUTH UNIV
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