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A method and system for recovering positive electrodes from waste lithium batteries and regenerating them

A waste lithium battery, ternary lithium battery technology, applied in battery recycling, waste collector recycling, recycling technology and other directions, can solve the problem of poor material stability and consistency, bacterial culture, harsh use conditions, and restricting technology applications promotion and other issues, to achieve the effects of mild and controllable heat treatment process, excellent capacity retention, and advanced peeling technology

Active Publication Date: 2021-07-16
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the process technology of alkali dissolution-acid leaching-extraction of nickel, cobalt and manganese, although the extraction efficiency of the solvent extraction method is high and the product purity is high, the organic solvent is more or less dissolved and volatile and pollutes the environment, causing secondary Pollution, and the cost of the extraction method is relatively high, and there are limitations in industrial production
Another example is that due to the similar potential of nickel and cobalt, nickel and cobalt will be deposited synchronously in the electrodeposition technology to form a cobalt-nickel alloy, which will affect the subsequent purification and restrict the expanded application.
Other methods such as ion exchange method, sulfide bacteria leaching, etc. have successfully recovered valuable metal elements, but these methods have certain limitations, such as ion exchange method is more complicated to operate, the steps are more cumbersome, and it is only suitable for the separation and purification of a small amount of ions ; Factors such as the cultivation of sulfur bacteria leaching technology bacteria, harsh conditions of use, and difficulty in industrialization have restricted the application and promotion of the technology
Moreover, the existing waste battery recycling process is basically to precipitate or extract nickel, cobalt and manganese, and then purify the lithium-containing solution, which consumes a lot of acid and alkali and has a lengthy process. The product is the primary raw material for the synthesis of positive electrode materials.
Furthermore, the positive electrode powder recovered by traditional dry method contains a little metal impurities or the original material structure is destroyed during the recovery process. The recovered powder cannot be directly reused or the stability and consistency of the material after simple modification Poor performance restricts recycling

Method used

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  • A method and system for recovering positive electrodes from waste lithium batteries and regenerating them
  • A method and system for recovering positive electrodes from waste lithium batteries and regenerating them
  • A method and system for recovering positive electrodes from waste lithium batteries and regenerating them

Examples

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Embodiment 1

[0079]A certain type of waste ternary lithium battery is used as raw material. First discharge the used batteries, remove the shell, cut the ends in a closed protective atmosphere, extract the pole pieces and diaphragm, and clean the electrolyte and electrolyte in the cleaning tank, and the air-dried pole pieces are sorted, cut and classified into positive , Negative plate and diaphragm. The negative plate is soaked in water to dissolve the binder, filtered and dried to recover the primary copper foil and carbon powder. Weigh 500g of the sorted positive electrode and treat it in a muffle furnace at 650°C for 5 minutes, then remove the binder, quench the water from 650°C to 30°C instantly, and process it in ultrasonic vibration for 30 minutes to peel off the positive electrode material and aluminum foil , filtered to obtain aluminum foil and black powder, and then dried at 50°C. The aluminum foil is separated by screening, and the aluminum foil can be directly used for alumin...

Embodiment 2

[0082] A certain type of waste ternary lithium battery is used as raw material. First discharge the used batteries, remove the shell, cut the ends in a closed protective atmosphere, extract the pole pieces and diaphragm, and clean the electrolyte and electrolyte in the cleaning tank, and the air-dried pole pieces are sorted, cut and classified into positive , Negative plate and diaphragm. The negative plate is soaked in water to dissolve the binder, filtered and dried to recover the primary copper foil and carbon powder. Weigh 1,200g of the sorted positive electrode and treat it in a muffle furnace at 450°C for 360min, then remove the binder, quench the water from 550°C to 20°C instantly, and process it in ultrasonic vibration for 20min to peel off the positive electrode material and aluminum foil , filtered to obtain aluminum foil and black powder, and then dried at 80°C. The aluminum foil is separated by screening, and the aluminum foil can be directly used for aluminum sm...

Embodiment 3

[0084] A certain type of waste ternary lithium battery is used as raw material. First discharge the used batteries, remove the shell, cut the ends in a closed protective atmosphere, extract the pole pieces and diaphragm, and clean the electrolyte and electrolyte in the cleaning tank, and the air-dried pole pieces are sorted, cut and classified into positive , Negative plate and diaphragm. The negative plate is soaked in water to dissolve the binder, filtered and dried to recover the primary copper foil and carbon powder. Weigh 800g of the sorted positive electrode and treat it in a muffle furnace at 550°C for 30 minutes, then remove the binder, and quench the water from 450°C to 10°C instantly, and process it in ultrasonic vibration for 30 minutes to peel off the positive electrode material and aluminum foil , filtered to obtain aluminum foil and black powder, and then dried at 60°C. The aluminum foil is separated by screening, and the aluminum foil can be directly used for ...

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Abstract

The invention discloses a method and system for recovering positive electrodes from waste lithium batteries and regenerating and repairing them. The method includes: reclaiming the electrolyte solution in the waste ternary lithium battery; removing the binder in the obtained positive electrode sheet and negative electrode sheet, and then separating the positive electrode sheet through cooling, magnetic separation, and screening, and then roasting Processing to obtain positive electrode powder; grinding and sintering the mixture containing positive electrode powder, lithium salt and coating raw materials to obtain repaired composite positive electrode material. The invention classifies and recycles the various components of the lithium battery, preferentially recycles the electrolyte, accurately disassembles and separates the positive and negative materials, strictly sieves the process conditions, and completely separates the metal debris from the positive powder, and then combines it with the advanced modification technology In combination, the process is basically a dry recovery process, which avoids the secondary pollution caused by acid-base leaching and extraction recovery in the traditional hydrometallurgical recovery process, and the recovered and regenerated positive electrode materials can be directly used in lithium batteries production.

Description

technical field [0001] The invention relates to a method for recovering positive electrodes of lithium batteries, in particular to a method and system for recovering positive electrodes from waste lithium batteries and regenerating them, and belongs to the technical field of lithium battery recovery. Background technique [0002] Lithium and lithium compounds are important energy materials, widely used in energy storage power supply and national defense construction. Lithium-ion batteries have the characteristics of high energy density, high voltage platform, small self-discharge, and no memory effect. They have developed into the main energy source of 3C electronic products, accounting for more than 80% of the consumer electronics market. Benefiting from the high growth of the new energy vehicle industry, domestic power battery shipments were 39.2GWh in 2017, and it is expected that the CAGR will remain above 30% in the next three years. The effective life of the battery o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 彭正军王敏祝增虎王怀有贾国凤赵有璟
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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