Lithium ion battery positive electrode material recycling and regenerating process

A technology for lithium-ion batteries and positive electrode materials, which is applied in the field of lithium-ion battery positive electrode material recovery and regeneration technology, can solve the problems of high recycling cost and low yield of lithium ion positive electrode materials recovered by hydrometallurgy, so as to reduce process costs and improve recovery Efficiency and economy, the effect of less impurities

Pending Publication Date: 2022-07-29
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the technical problems of low yield and high recovery cost of lithium ion positive electrode material recovered by hydrometallurgy in the above technology, the present invention proposes a recycling process for lithium ion battery positive electrode material

Method used

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  • Lithium ion battery positive electrode material recycling and regenerating process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Pretreatment: Put the retired lithium-ion battery in a 5% NaCl solution and soak it in the battery for 96 hours. Use the action of conductive salt to short-circuit the positive and negative electrodes to consume electricity, and the final battery voltage is lower than 0.5V.

[0052] Pretreatment: disassemble the lithium-ion battery pack to obtain a single battery, and then sort out the battery shell, electrodes and separators. After mechanically crushing and grinding the electrodes, they were placed in the roasting furnace for 2.5 hours, and the medium-temperature flue gas generated by the annealing furnace was used to provide heat for the roasting furnace. After the reaction is completed, the electrode sheet is taken out and cooled, and the powdery active material can be peeled off and collected from the current collector by shaking the electrode sheet lightly. Its volatile, low temperature flue gas is finally discharged after being treated by waste gas treatment equip...

Embodiment 2

[0059] Pretreatment: Decommissioned Li-ion batteries were placed in 7% MnSO 4 The solution is soaked in the battery for 100 hours, and the positive and negative electrodes are short-circuited by the action of the conductive salt to consume electricity, and the final battery voltage is lower than 0.5V.

[0060] Pretreatment: disassemble the lithium-ion battery pack to obtain a single battery, and then sort out the battery shell, electrodes and separators. After mechanically crushing and grinding the electrode sheet, it was placed in the roasting furnace for 2 hours, and the medium-temperature flue gas generated by the annealing furnace was used to provide heat for the roasting furnace. After the reaction is completed, the electrode sheet is taken out and cooled, and the powdery active material can be peeled off and collected from the current collector by shaking the electrode sheet lightly. Volatile, low temperature flue gas is finally discharged after being treated by waste g...

Embodiment 3

[0066] Pretreatment: Put the retired lithium-ion battery in 8% NaCl solution for 80h, and use the conductive salt to short-circuit the positive and negative electrodes to consume electricity, and the final battery voltage is lower than 0.5V.

[0067] Pretreatment: disassemble the lithium-ion battery pack to obtain a single battery, and then sort out the battery shell, electrodes and separators. After mechanically crushing and grinding the electrode sheet, it was put into the roasting furnace for 3 hours, and the medium-temperature flue gas generated by the annealing furnace was used to provide heat for the roasting furnace. After the reaction is completed, the electrode sheet is taken out and cooled, and the powdery active material can be peeled off and collected from the current collector by shaking the electrode sheet lightly. Volatile, low temperature flue gas is finally discharged after being treated by waste gas treatment equipment.

[0068] Wet leaching: prepare 3 mol / L...

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Abstract

The invention discloses a lithium ion battery positive electrode material recycling and regenerating process, which does not separate and purify valuable metals in a leaching solution, but directly supplements elements and adjusts the proportion of the elements to regenerate the positive electrode material, so that the tedious separation step is omitted, and the process cost is reduced. The method has the advantages that the problem of complicated element separation of a nickel, cobalt, manganese and lithium mixed solution system can be avoided, the lithium loss is reduced, the additional value of regenerated products can be obviously increased, the recovery efficiency and the economical efficiency are improved, and the closed circulation of waste lithium ion battery materials is realized; high-temperature flue gas generated by the regeneration furnace is conveyed to the annealing furnace, the roasting furnace and the atomizing chamber for multi-stage full utilization, multi-stage utilization of high-temperature flue gas, medium-temperature flue gas, low-temperature flue gas and waste gas is achieved in the whole flue gas circulation process, energy consumption in the process is saved, and heat loss of the system is reduced.

Description

technical field [0001] The invention relates to the technical field of recycling waste batteries, in particular to a recycling and regeneration process for positive electrode materials of lithium ion batteries. Background technique [0002] Since the commercialization of lithium-ion batteries (LIBs) by Sony Corporation in 1990, they have been widely used in electronic products, electric vehicles, and energy storage devices. The service life of lithium-ion battery products is about 3-10 years. Therefore, a large number of lithium-ion batteries will be retired at the current stage and for a long time in the future. Lithium-ion batteries are mainly composed of an outer shell and an inner core. The inner core is its core part, including positive electrode material, negative electrode material, electrolyte and separator. The cathode material is the most important component that determines the performance of lithium-ion batteries. Commonly used cathode materials include ternary m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M10/0525H01M4/505H01M4/525C01G53/00
CPCH01M10/54H01M10/0525H01M4/505H01M4/525C01G53/44H01M2004/028
Inventor 雷蕾张扬张海
Owner TSINGHUA UNIV
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