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Full-dry purification method of lithium ion battery positive electrode material and lithium ion battery positive electrode material obtained through purification

A technology for lithium-ion batteries and positive electrode materials, applied in the field of comprehensive utilization of lithium-ion battery positive electrode materials, can solve the problems of destroying the structure of positive electrode materials, complicated selection and investment, and difficult industrial production, etc., and achieves simple recovery process, high purity, and mild processing temperature Effect

Inactive Publication Date: 2020-02-21
武汉瑞杰特材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The materials synthesized by metallurgical methods have high purity, and the main content meets the design value, but the original structure of the positive electrode material is destroyed, the steps are complicated, the energy consumption is high, and it is difficult to realize large-scale industrial production
There are also patents that disclose a process of directly crushing and recovering positive electrode powder, and flotation to remove impurities and regenerate. This process greatly reduces the cost input and has certain practicability. However, the process of flotation and impurity removal is adopted. Selection of inputs with appropriate reagents remains complex

Method used

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  • Full-dry purification method of lithium ion battery positive electrode material and lithium ion battery positive electrode material obtained through purification
  • Full-dry purification method of lithium ion battery positive electrode material and lithium ion battery positive electrode material obtained through purification
  • Full-dry purification method of lithium ion battery positive electrode material and lithium ion battery positive electrode material obtained through purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] 1) Use a shearing machine to cut the positive electrode sheet obtained from the decommissioned 523 soft bag into a size of 2cm*2cm, according to 2kg / bowl (330*330*100mm 3 ), hold 4 bowls.

[0058] 2) In a dry air atmosphere (5m 3 / h), 3°C / min heating rate, under the condition of 400°C / 0.5h, the pole piece is pyrolyzed.

[0059] 3) Ultrasonic vibrating sieving to separate the powder from the aluminum foil, and the sieve meshes are 50 mesh and 300 mesh. The powder below 300 mesh is collected for high-temperature impurity removal, the recovery rate is 98.5%, >95%, and the separation is considered complete. Since the aluminum foil is hardly oxidized and pulverized, and the PVDF is basically invalid, the 50-mesh screen is almost clean aluminum foil, and the aluminum impurity in the powder is 0.13%.

[0060] 4) High temperature removal of impurities. The amount of bowl is 4kg / burning bowl (330*330*100mm 3 ); in a dry air atmosphere, sinter at 600° C. for 1 h, pass throug...

Embodiment 2

[0070] 1) Use a shearing machine to cut the leftovers of the lithium iron phosphate positive electrode sheet into a size of 10cm*10cm, take 100g and put it into a crucible.

[0071] 2) Under the conditions of high-purity nitrogen atmosphere (1.6L / min), heating rate of 3°C / min, and 500°C / 0.5h, the pole piece is pyrolyzed.

[0072] 3) Knock off manually to separate the powder from the aluminum foil, and the separated powder forms into flakes, such as Figure 4 After being ground, pass through a 300-mesh sieve. The powder below 300 mesh is collected for high-temperature impurity removal, and the recovery rate is 99%, >95%, and the separation is considered complete.

[0073] 4) High temperature removal of impurities. The amount of potting is 1cm in depth; in a high-purity nitrogen atmosphere, sinter at 650°C for 1 hour, and pass through a 300-mesh sieve to obtain the purified material 2.

[0074] SEM characterization was carried out on the powder obtained by peeling off and th...

Embodiment 3

[0076] 1) Use a shearing machine to cut the 523 leftover positive electrode sheet into a size of 2cm*2cm, and press 2kg / bowl (330*330*100mm 3 ), hold 4 bowls.

[0077] 2) In a dry air atmosphere (3m 3 / h), 5°C / min heating rate, under the condition of 400°C / 2h, the pole piece is pyrolyzed.

[0078] 3) Ultrasonic vibrating sieving to separate the powder from the aluminum foil, and the sieve meshes are 50 mesh and 300 mesh. The powder below 300 mesh is collected for high-temperature impurity removal, the recovery rate is >95%, and the separation is considered complete. Since the aluminum foil is hardly oxidized and pulverized, and the PVDF is basically invalid, the 50-mesh screen is almost clean aluminum foil, and the aluminum impurity in the powder is 0.216%.

[0079] 4) High temperature removal of impurities. The amount of bowl is 1kg / burning bowl (330*330*100mm 3 ); in a dry air atmosphere, sinter at 600°C for 0.5h, pass through a 300-mesh sieve, and obtain the purified m...

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Abstract

The invention belongs to the technical field of comprehensive utilization of lithium ion battery positive electrode materials, and particularly relates to a full-dry purification method of a lithium ion battery positive electrode material and the lithium ion battery positive electrode material obtained through purification. The method comprises the following steps: (1) heating crushed materials ofa lithium battery positive electrode recycled material at a low temperature until an adhesive is invalid to obtain a mixture where a current collector and a lithium battery positive electrode to-be-purified material is separated; 2) performing vibration sieving on the mixture where the current collector and the lithium battery positive electrode to-be-purified material is separated to obtain thelithium battery positive electrode to-be-purified material from which the current collector is removed; and 3) carrying out sintering on the lithium battery positive electrode to-be-purified materialfrom which the current collector is removed to obtain the lithium battery positive electrode purified material. Full-dry purification of the lithium ion battery positive electrode material is realized, and the lithium battery positive electrode purified material obtained through purification is high in purity.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of positive electrode materials of lithium ion batteries, and in particular relates to an all-dry purification method of positive electrode materials of lithium ion batteries and the purified positive electrode materials of lithium ion batteries. Background technique [0002] The lithium-ion battery industry is developing rapidly. It is estimated that by 2020, there will be a global market worth 32 billion US dollars. Its service life is about 5-10 years, and it is estimated that in 2020, there will be 500,000 tons of decommissioned batteries. Materials such as excessive metals, lithium, copper and current collectors in waste lithium-ion batteries will generate huge economic benefits if they are recycled. If they are discarded directly, they will not waste resources and pollute the environment. Therefore, it is imminent to develop a simple, environmentally friendly and operable ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/54H01M4/139
CPCH01M4/139H01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 不公告发明人
Owner 武汉瑞杰特材料有限责任公司
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