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A kind of preparation method of lithium ion battery composite separator

A technology for lithium-ion batteries and composite diaphragms, which is applied in the field of preparation of lithium-ion battery composite diaphragms, can solve the problems of limited application, poor electrolyte affinity and thermal stability, and achieve good thermal stability and excellent liquid absorption effect , the effect of good mechanical properties

Active Publication Date: 2022-07-22
江西厚鼎能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercialized lithium-ion battery separators mainly use polyolefin porous membranes, such as polyethylene (PE), polypropylene (PP) and their composite separators. Although they have good chemical stability and excellent mechanical properties, their Poor electrolyte affinity and thermal stability limit its application in new generation lithium-ion batteries

Method used

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  • A kind of preparation method of lithium ion battery composite separator
  • A kind of preparation method of lithium ion battery composite separator
  • A kind of preparation method of lithium ion battery composite separator

Examples

Experimental program
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Embodiment 1

[0016] A preparation method of a lithium-ion battery composite diaphragm, specifically comprising the following steps:

[0017] S1: Disperse graphene oxide in distilled water, then add dopamine and move it to a polytetrafluoroethylene reactor, react at 120 °C for 2 h, cool down, filter, and dry under vacuum conditions for use, wherein graphene oxide, distilled water and The mass-to-volume ratio of dopamine is 1.2g:20mL:0.69g.

[0018] S2: Add nano-alumina into N,N-dimethylformamide, add polypropylene after ultrasonic dispersion, then heat up to 80°C to dissolve polypropylene to obtain a mixed solution, and use the casting method to obtain a composite polymer The propylene film, wherein the thickness of the film is controlled to be between 1.5mm, wherein the mass-to-volume ratio of nano-alumina, N,N-dimethylformamide and polypropylene is 0.22g:18mL:1.15g.

[0019] S3: placing the product obtained in step S1 in a magnetron sputtering device, laying the film in step S2 on a copp...

Embodiment 2

[0022] A preparation method of a lithium-ion battery composite diaphragm, specifically comprising the following steps:

[0023] S1: disperse graphene oxide in distilled water, then add dopamine and move it to a polytetrafluoroethylene reactor, react at 140 ° C for 4 h, cool down, filter, and dry under vacuum conditions for use, wherein graphene oxide, distilled water and The mass-to-volume ratio of dopamine is 1.8g:35mL:0.88g.

[0024] S2: adding nano-alumina into N,N-dimethylformamide, ultrasonically dispersing and adding polypropylene, then heating up to 90°C to dissolve the polypropylene to obtain a mixed solution, and using the casting method to obtain a composite polymer The propylene film, wherein the thickness of the film is controlled to be between 2mm, wherein the mass-volume ratio of nano-alumina, N,N-dimethylformamide and polypropylene is 0.36g:40mL:1.96g.

[0025] S3: placing the product obtained in step S1 in a magnetron sputtering device, laying the film in step...

Embodiment 3

[0028] A preparation method of a lithium-ion battery composite diaphragm, specifically comprising the following steps:

[0029] S1: Disperse graphene oxide in distilled water, then add dopamine and move it to a polytetrafluoroethylene reactor, react at 130 °C for 3 hours, cool down, filter, and dry under vacuum conditions for use, wherein graphene oxide, distilled water and The mass-to-volume ratio of dopamine is 1.5g:25mL:0.74g.

[0030] S2: Add nano-alumina into N,N-dimethylformamide, add polypropylene after ultrasonic dispersion, then heat up to 85°C to dissolve polypropylene to obtain a mixed solution, and use a casting method to obtain a composite polymer Propylene film, wherein the thickness of the film is controlled to be between 1.8mm, wherein the mass-volume ratio of nano-alumina, N,N-dimethylformamide and polypropylene is 0.26g:25mL:1.35g.

[0031] S3: placing the product obtained in step S1 in a magnetron sputtering device, laying the film in step S2 on a copper pl...

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Abstract

The invention discloses a preparation method of a lithium-ion battery composite diaphragm, which comprises dispersing graphene oxide in distilled water, adding dopamine, transferring it to a polytetrafluoroethylene reactor, reacting at 120-140° C. for 2-4 hours and then cooling down , filter, vacuum dry, add nano-alumina into N,N-dimethylformamide, ultrasonically disperse, add polypropylene and heat up to 80-90°C to dissolve polypropylene to obtain a mixed solution. The composite polypropylene film was obtained by the method, and the thickness of the film was controlled to be between 1.5 and 2 mm; the obtained product was placed in a magnetron sputtering device, the film was flattened on a copper plate, and the product was sputtered by magnetron sputtering to On the film, after the sputtering coating on the film surface is completed, the same method is used for sputtering coating on the other side of the film to obtain the diaphragm precursor; the diaphragm precursor is placed in a container, distilled water is added, and Tris buffer is added dropwise, The pH value of the solution is adjusted to 11-11.6, and after standing for 1.5-3 hours, the solution is taken out and dried in a vacuum environment to obtain the composite membrane.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery separators, and particularly relates to a preparation method of a lithium ion battery composite separator. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products, electric vehicles and other fields due to their advantages of high specific energy, long cycle life and environmental friendliness. The development of a new generation of portable electronic products and electric vehicles has put forward higher requirements for the safety and energy density of lithium-ion batteries. The separator is one of the important components of lithium-ion batteries, its role is to prevent physical contact between the positive and negative electrodes, and to provide ion conductivity by absorbing electrolyte. Although the separator does not directly participate in the battery reaction, its structure and properties determine the performance of the battery, inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/403H01M50/417H01M50/431H01M10/0525C23C14/35C23C14/06
CPCH01M10/0525C23C14/35C23C14/0605Y02E60/10
Inventor 房彦润
Owner 江西厚鼎能源科技有限公司