Method for direct recovery and restoration of lithium ion battery positive electrode material

A technology for lithium ion batteries and cathode materials, which is applied in the field of resource recycling and can solve the problems of waste liquid generation, high cost, secondary pollution, etc. in the separation process of electrode sheets

Active Publication Date: 2014-07-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recovery and reuse of positive electrode materials by hydrometallurgical process requires dissolution and leaching, and waste liquid will be generated in each stage, causing serious secondary pollution, and the process is complicated and the cost is high.
In addition, as described in patent CN101383442B, NaOH is used to dissolve aluminum to separate deactivated lithium cobaltate, and the positive electrode material is directly supplemented with lithium and roasted to reuse the positive electrode material. rough development model

Method used

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  • Method for direct recovery and restoration of lithium ion battery positive electrode material
  • Method for direct recovery and restoration of lithium ion battery positive electrode material
  • Method for direct recovery and restoration of lithium ion battery positive electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0060] The cathode material is Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 After dismantling the lithium-ion battery, select 100g of the positive electrode sheet whose binder is PVDF, and soak it in NMP at 60°C. After the active material powder is separated from the aluminum foil current collector, filter, wash, and vacuum-dry to obtain the recovered powder, organic solvent NMP can be recycled after treatment. Add the above powder into water, pour it into a separatory funnel and let it stand for 30 minutes. The acetylene black conductive agent floats above the water, and the positive electrode material sinks to the bottom. The powder at the bottom flows out, and is filtered and dried to obtain the positive electrode material powder. The XRD pattern is shown in figure 2 . ICP composition analysis shows that the chemical composition of the cathode material contains 7.01% lithium, 20.90% nickel, 20.80% cobalt and 19.86% manganese.

Embodiment 2

[0062] The cathode material is Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 After the lithium-ion battery is disassembled, 100g of the positive electrode sheet whose binder is PTFE is selected, and the N 2 Treat in a protected tube atmosphere furnace for 3 hours, and the tail gas needs to be collected and processed. After the furnace is cooled, take out the positive electrode sheet, mechanically rub the active material and the current collector to separate, use a 400-mesh standard sieve to sieve, take the undersieve, separate by heavy liquid method, and obtain the XRD pattern of the positive electrode material powder, see image 3 . ICP composition analysis shows that the chemical composition of the cathode material contains 6.47% lithium, 18.51% nickel, 18.73% cobalt, and 19.30% manganese.

Embodiment 3

[0064] figure 2 The positive electrode material powder XRD pattern that shown embodiment 1 reclaims can be seen and α-NaFeO 2 The standard diffraction peaks correspond, indicating that the recovered cathode material powder still has the typical α-NaFeO 2 structure Space group and hexagonal crystal system. Obvious (006) / (012) and (018) / (110) split peaks can be observed in the XRD pattern, indicating that the recovered cathode material powder still has a good layered structure. Comparing its chemical composition with Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 According to the theoretical composition, it is found that the lithium content has a small amount of loss, according to the chemical ratio, weigh Li 2 CO 3 Mix and ball mill with recycled powder, the molar ratio of Li / (Ni+Co+Mn) is 1.1:1, and then put it in a muffle furnace at 850°C for 10h to repair the recycled material. ICP composition analysis shows that the chemical composition of the repaired cathode material powder is 7...

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Abstract

The invention discloses a method for direct recovery and restoration of a lithium ion battery positive electrode material, and belongs to the field of resource recycling. According to the method, waste positive electrode pieces of lithium cobaltate or lithium nickel manganese cobalt multi-element layered oxide or a positive electrode piece leftover material and defective products are used as a positive electrode material; the materials are classified according to the type of binder by component analysis, the binder is directly damaged, cleaning and separation of the positive electrode material and a current collector are realized; by use of a heavy liquid separation principle, the positive electrode and a conductive agent are separated; the positive electrode failure mechanism is studied by use of SEM (scanning electron microscope), XRD (X-ray diffraction), STEM (scanning transmission electron microscope), XPS (X-ray photoelectron spectroscopy) and other analysis means; chemical components of the positive electrode material with the layered structure not damaged can be repaired by high temperature roasting, the layered structure of the positive electrode material with disordered and defective crystal lattice can be repaired by dissolving with a hydrothermal reaction and then precipitation, and the positive electrode material with good charge discharge performances can be again obtained. The method avoids the dissolving leaching process, reduces waste liquid generation, and simplifies the technological process.

Description

technical field [0001] The invention belongs to the field of resource recycling, and provides a method for directly repairing the anode material of a waste lithium-ion battery by using the subject of material science. Background technique [0002] Since Sony successfully developed and commercialized lithium-ion batteries in 1990, lithium-ion batteries have a series of advantages such as high working voltage, high specific energy, long cycle life, and good safety. It has been widely used in aerospace, military and medical fields, and is called "the most promising chemical power source". In recent years, the demand for lithium-ion batteries for various purposes has increased year by year, especially in the field of portable electronic products such as mobile phones, notebook computers, cameras and power tools. Lithium-ion batteries, as the preferred power source, have a huge market. Today, when low-carbon economy and energy conservation and emission reduction are vigorously a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54C22B7/00
CPCC22B7/00H01M10/54Y02P10/20Y02W30/84
Inventor 赵丽利朱永平王学营
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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