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A method for preparing lithium battery diaphragm by grafting polyethylene adipate on polyethylene surface

A technology of polyethylene adipate and lithium battery diaphragm, which is applied to battery components, circuits, electrical components, etc., can solve problems such as poor electrolyte affinity and short circuit, and achieve extended service life and high safety performance , the effect of sufficient safety

Active Publication Date: 2017-10-17
中材锂膜(宁乡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the shortcomings of the currently used polyethylene and polypropylene separators that have poor affinity for electrolytes, resulting in problems such as short circuit, overcharging, and acupuncture, a polyethylene surface grafted polymer is provided. A method for preparing a lithium battery diaphragm from ethylene glycol adipate, the lithium battery diaphragm prepared by the method has high safety performance and good affinity to electrolytes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] First, in parts by weight, select 75 parts of polyethylene, 24.5 parts of polyethylene adipate and 0.5 part of composite antioxidant, mix at a high speed of 2000r / min in a high-speed mixer, and the mixing time for 10 minutes; then put the mixed materials into a twin-screw extruder for extrusion granulation to obtain blended pre-modified polyethylene resin particles, and add the pre-modified polyethylene resin particles into the lower hopper , and then come out from the die mouth of the die head, after being cooled by the air ring and inflated, it is taken up by the herringbone plate traction roller of the foam stabilizer, and then the finished film is rolled into a cylinder to obtain a polyethylene film; the polyethylene film prepared above Put it in an irradiation bottle, vacuumize it, and then inject argon gas, place the above-mentioned airtight irradiation device filled with argon gas in the γ-ray irradiation source room for irradiation, and the irradiation time is 20...

example 2

[0024]First in parts by weight, choose 80 parts of polyethylene, 19.5 parts of polyethylene adipate and 0.5 part of composite antioxidant, mix at a high speed of 2250r / min in a high-speed mixer, and the mixing time for 13 minutes; then put the mixed materials into a twin-screw extruder for extrusion and granulation to obtain blended pre-modified polyethylene resin particles, and add the pre-modified polyethylene resin particles into the lower hopper , and then come out from the die mouth of the die head, after being cooled by the air ring and inflated, it is taken up by the herringbone plate traction roller of the foam stabilizer, and then the finished film is rolled into a cylinder to obtain a polyethylene film; the polyethylene film prepared above Put it in an irradiation bottle, vacuumize it, and then pass in argon gas, place the above-mentioned airtight irradiation device filled with argon gas in the γ-ray irradiation source room for irradiation, and the irradiation time is...

example 3

[0027] First, in parts by weight, select 95 parts of polyethylene, 4.5 parts of polyethylene adipate and 0.5 parts of composite antioxidant, mix at a high speed of 2500r / min in a high-speed mixer, and the mixing time for 15 minutes; then put the mixed materials into a twin-screw extruder for extrusion granulation to obtain blended pre-modified polyethylene resin particles, and add the pre-modified polyethylene resin particles into the lower hopper , and then come out from the die mouth of the die head, after being cooled by the air ring and inflated, it is taken up by the herringbone plate traction roller of the foam stabilizer, and then the finished film is rolled into a cylinder to obtain a polyethylene film; the polyethylene film prepared above Put it in an irradiation bottle, vacuumize it, and then inject argon gas, place the above-mentioned airtight irradiation device filled with argon gas in the γ-ray irradiation source room for irradiation, and the irradiation time is 30...

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Abstract

The invention discloses a method for preparing a lithium battery diaphragm by grafting polyethylene adipate on the surface of polyethylene, and belongs to the technical field of lithium battery diaphragm preparation. The lithium battery diaphragm of the present invention is obtained by selecting polyethylene, polyethylene adipate and composite antioxidant through high-speed stirring and mixing, putting them into an extruder to extrude and granulate, and obtaining a blended pre-modified polyethylene Resin granules, and then put them into the lower hopper, after cooling, blowing, curling into a tube for modification, put them in an irradiation bottle, and pass argon gas under a vacuum state, graft polyethylene adipate Prepared after washing and drying. The beneficial effects of the present invention are: the lithium battery diaphragm prepared by the method has high safety performance, the service life is extended by 50% of the original, and the affinity to the electrolyte is better; when the internal short circuit can provide better protection, when overcharging Can provide sufficient security, good mechanical properties and thermal stability.

Description

technical field [0001] The invention relates to a method for preparing a lithium battery diaphragm by grafting polyethylene adipate on the surface of polyethylene, and belongs to the technical field of lithium battery diaphragm preparation. Background technique [0002] Lithium-ion batteries have the characteristics of high specific energy, long cycle life, and no memory effect. They are also safe, reliable, and capable of fast charging and discharging. Lithium-ion batteries are mainly composed of positive and negative electrode materials, electrolytes, and separators. There is a membrane material between the positive and negative electrodes of the lithium-ion battery, usually called a separator, which is an important part of the lithium-ion battery. The main function of the diaphragm is to isolate the positive and negative electrodes and prevent the electrons in the battery from freely passing through, allowing ions to pass freely between the positive and negative electrode...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14H01M50/403
CPCH01M50/403Y02E60/10
Inventor 高保清陈红辉舒均国
Owner 中材锂膜(宁乡)有限公司
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