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A recovery method for waste lithium cobalt oxide cathode material without strong acid leaching

A technology for positive electrode materials and recycling methods, which is applied in the field of recycling waste lithium cobalt oxide positive electrode materials, can solve the problems of waste of cobalt resources, high cobalt leaching rate, etc., achieve the effects of reducing emissions, avoiding excessive acidity, and significant economic value

Active Publication Date: 2022-06-17
HUNAN YACHENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a high recovery rate for manganese, but the highest leaching rate for cobalt is only 85.3%.
However, this will still cause a large degree of waste of cobalt resources

Method used

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  • A recovery method for waste lithium cobalt oxide cathode material without strong acid leaching
  • A recovery method for waste lithium cobalt oxide cathode material without strong acid leaching
  • A recovery method for waste lithium cobalt oxide cathode material without strong acid leaching

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Embodiment 1

[0029] Embodiment 1 of the present invention is: a method for recycling waste and old lithium cobalt oxide cathode materials without strong acid leaching, comprising the following steps:

[0030] (1) The waste lithium cobalt oxide battery positive electrode sheet obtained by dismantling is pulverized into pieces of 1-5 cm to obtain positive electrode sheet fragments, and the positive electrode sheet fragments are immersed in 2 mol / L sodium hydroxide solution, and after solid-liquid separation, the The precipitated residue is dried to obtain crude lithium cobalt oxide powder;

[0031] (2) According to the mass ratio of crude lithium cobalt oxide powder and polyvinyl chloride (PVC) to 1:4, mix the two evenly, and transfer them to a horizontal tube furnace, at a temperature of 5°C / min ( Usually, the temperature is increased at a rate of 3 to 5°C / min), the temperature is increased to 250°C, and the temperature is kept for 2 hours, and the mixed powder is obtained after cooling to ...

Embodiment 1

[0053] In combination with Comparative Example 1 and Example 1, the present invention provides a method for recycling waste lithium cobalt oxide cathode materials without strong acid leaching, which requires high temperature roasting of the mixed powder of lithium cobalt oxide and polyvinyl chloride.

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Abstract

The invention discloses a method for recovering waste lithium cobalt oxide positive electrode material without strong acid leaching, comprising the following steps: S1, taking the waste lithium cobalt oxide positive electrode sheet, soaking it in a strong alkaline solution, and performing solid-liquid separation for the first time, Dry the solid phase part to obtain rough lithium cobaltate powder; S2, mix the crude lithium cobaltate powder with polyvinyl chloride, and roast at 230°C to 350°C to obtain a mixed powder; S3, add water to the mixed powder for water immersion processing, performing a second solid-liquid separation; S4, oxidizing the separated liquid phase to obtain cobalt oxide precipitation. This method can effectively avoid the use of strong acid leaching, reduce the amount of toxic gas emissions from the source, and reduce secondary pollution; the recovery rate of cobalt in the embodiment of the invention can reach more than 90%, which is significantly better than the existing technical level, and has achieved It has made great progress and can generate significant economic value. At the same time, it has further reduced the impact of resource waste and environmental pollution caused by waste cobalt metal.

Description

technical field [0001] The invention relates to the technical field of recycling waste lithium batteries, in particular to a method for recycling waste lithium cobalt oxide positive electrode materials. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics, electric vehicles, and hybrid vehicles due to their high energy density, high power density, and environmental friendliness. The rapid development of electric vehicles has strongly promoted the application of lithium-ion batteries. At the same time, a large number of waste lithium-ion batteries are inevitably produced in the market. Waste lithium-ion batteries not only contain abundant metal resources (such as Co, Li, etc.), but also contain organic substances that are harmful to the environment. If the waste lithium battery is not recycled, it will not only cause waste of metal resources, but also cause serious pollution to the environment. Since the raw materials Li and Co used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B7/00C22B1/08C22B23/00C22B26/12
CPCC22B7/008C22B7/006C22B1/08C22B23/0446C22B23/0407C22B23/0461C22B26/12Y02W30/84
Inventor 林奕颜志雄万文治杨政李万罗强
Owner HUNAN YACHENG NEW MATERIAL CO LTD