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Process for recycling and regenerating lithium cobalt oxide in waste lithium cobalt oxide battery

A technology of lithium cobaltate and lithium cobaltate, which is applied in battery electrodes, secondary batteries, battery recycling, etc., can solve the problems of low purity of precipitated recovered products, large impact of inorganic acids on the environment, and low utilization rate of elements. Obvious social value, low equipment requirements, and simple regeneration process

Inactive Publication Date: 2019-07-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple and easy to operate, with low energy consumption, but the use of inorganic acid has a great impact on the environment and the purity of the precipitated recovery is not high
[0008] The traditional waste lithium cobalt oxide battery treatment process generally focuses on leaching the high-value elements such as Co and Li in the positive electrode material lithium cobalt oxide, and then recovers metals through precipitation, extraction, or electrochemical methods. The recovery process is relatively cumbersome. , and the element utilization rate is not high

Method used

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  • Process for recycling and regenerating lithium cobalt oxide in waste lithium cobalt oxide battery
  • Process for recycling and regenerating lithium cobalt oxide in waste lithium cobalt oxide battery
  • Process for recycling and regenerating lithium cobalt oxide in waste lithium cobalt oxide battery

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Embodiment 1

[0029] After the waste lithium cobalt oxide battery was discharged and disassembled, the positive electrode piece was put into the NMP solution for ultrasonication for 1 h. The stripped positive electrode material was calcined at 600° C. for 5 h to remove residual impurities in the positive electrode material. Get 5g of pretreated cathode material powder and add 250mL of citric acid (1mol / L) and H 2 o 2 (2vol%) mixed solution, stirred at 80°C for 60min, and then filtered to obtain the leachate. According to the Co in the leaching solution 2+ and Li + concentration, add corresponding cobalt source (basic cobalt carbonate) or lithium source (lithium hydroxide), and adjust the molar ratio of lithium and cobalt to 1:1. Reuse NH 3 ·H 2 O solution adjusted the pH of the leaching solution to 7, stirred at 80°C until a sol was formed, and then dried the sol in vacuum at 100°C for 24h to obtain a xerogel. The xerogel was calcined at 500 °C for 4 h, and finally, the calcined prod...

Embodiment 2

[0031] After the waste lithium cobalt oxide battery was discharged and disassembled, the positive electrode piece was put into the NMP solution for ultrasonication for 1 h. The stripped positive electrode material was calcined at 600° C. for 5 h to remove residual impurities in the positive electrode material. Get 5g of the pretreated cathode material powder and add 200mL of citric acid (1.5mol / L) and H 2 o 2 (3vol%) mixed solution, stirred at 70°C for 70min, and then filtered to obtain the leachate. According to the Co in the leaching solution 2+ and Li + concentration, add corresponding cobalt source (basic cobalt carbonate) or lithium source (lithium hydroxide), and adjust the molar ratio of lithium and cobalt to 1:1. Reuse NH 3 ·H 2 O solution adjusted the pH of the leaching solution to 7, stirred at 80°C until a sol was formed, and then dried the sol in vacuum at 100°C for 24h to obtain a xerogel. The xerogels were calcined at 700 °C for 4 h, and finally, the calci...

Embodiment 3

[0033] After the waste lithium cobalt oxide battery was discharged and disassembled, the positive electrode piece was put into the NMP solution for ultrasonication for 1 h. The stripped positive electrode material was calcined at 600° C. for 5 h to remove residual impurities in the positive electrode material. Get 5g of pretreated cathode material powder and add 330mL of citric acid (2mol / L) and H 2 o 2(1vol%) mixed solution, stirred at 60°C for 80min, and then filtered to obtain the leachate. According to the Co in the leaching solution 2+ and Li + concentration, add corresponding cobalt source (basic cobalt carbonate) or lithium source (lithium hydroxide), and adjust the molar ratio of lithium and cobalt to 1:1. Reuse NH 3 ·H 2 O solution adjusted the pH of the leaching solution to 7, stirred at 80°C until a sol was formed, and then dried the sol in vacuum at 100°C for 24h to obtain a xerogel. The xerogels were calcined at 900 °C for 4 h, and finally, the calcined pro...

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Abstract

The invention discloses a process for recycling and regenerating lithium cobalt oxide in a waste lithium cobalt oxide battery, which comprises the steps of firstly separating a collector and a cathodematerial in a positive pole plate of the lithium cobalt oxide battery by using an organic solvent N-methyl-2-pyrrolidinone (NMP), then removing residual impurities such as acetylene black and polyvinylidene fluoride (PVDF) in the cathode material by means of calcination, leaching cobalt and lithium elements in the cathode material by citric acid, and finally directly regenerating LiCoO2 from a leaching solution by adopting a sol-gel method, wherein citric acid plays a dual role of a leaching agent and a chelating agent in the process. According to the invention, a one-step technology route coupling an organic acid leaching method and a sol-gel method is adopted to recycle and regenerate LiCoO2, thereby avoiding the damage of organic acids to the environment, simplifying the recycling andregenerating process, reducing the cost, and achieving harmless treatment requirements while recycling the waste lithium cobalt oxide battery.

Description

technical field [0001] The invention belongs to the field of recovery of waste lithium ion batteries, and in particular relates to a recovery and regeneration process of lithium cobalt oxide, a positive electrode material of waste lithium cobalt oxide batteries. Background technique [0002] Lithium-ion batteries have the advantages of small size, high energy density, and no memory effect. They are more and more widely used in mobile devices, electric vehicles and other fields. Among them, lithium cobalt oxide batteries are mainly used for small power consumption such as mobile phones and notebook computers. The power supply of the device. The service life of lithium cobalt oxide batteries is generally two to three years. If the batteries after failure are not disposed of at will, not only the heavy metals they contain will pollute the environment, but also precious metals such as cobalt and lithium are not recycled. It is also a waste of resources. . With the wide applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/525H01M10/0525C01G51/00
CPCC01G51/42C01P2002/72C01P2004/03H01M4/525H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 陆颖舟张飞
Owner BEIJING UNIV OF CHEM TECH
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