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Nano-pore polymer electrolyte film and its preparation method

A technology of electrolyte membrane and polymer, applied in the direction of secondary battery parts, etc., can solve the problems of poor product uniformity and stability, difficult control of thermal compound process and solvent extraction process, and low yield of battery products, so as to reduce production The effect of low cost, low product cost, and excellent physical and mechanical properties

Inactive Publication Date: 2005-08-03
SICHUAN INDIGO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Production practice over the past few years has shown that the production technology of polymer lithium-ion batteries has relatively large defects. The main problem is that the thermal compounding process and solvent extraction process are difficult to control, resulting in low battery product yield, poor product uniformity and stability.

Method used

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  • Nano-pore polymer electrolyte film and its preparation method
  • Nano-pore polymer electrolyte film and its preparation method
  • Nano-pore polymer electrolyte film and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 80 grams of EVA resin with a melt index of 3 and a vinyl acetate content of 14% in 400 milliliters of toluene, add 160 milliliters of acrylonitrile monomer and 30 milliliters of triethyl phosphate, and then heat up to 80 °C ± 2 °C , start to drop 100 milliliters of toluene solution containing 0.4 gram dicumyl peroxide and 10 gram trimethylolpropane triacrylate, dropwise for about 3 hours, then continue to react at this temperature for 8 hours. Adding 120 grams of concentration after the reaction is finished is 20% gas phase method SiO 2 / triethyl phosphate slurry and stirred for 2 hours. The reaction product is scraped on the glass plate or directly coated on the carbon negative electrode sheet, and the microporous polymer electrolyte membrane or the microporous polymer electrolyte / carbon negative electrode composite electrode sheet is formed after the solvent is volatilized. The performance test results of the microporous polymer electrolyte membrane are show...

Embodiment 2

[0037] Dissolve 80 grams of EVA resin with a melt index of 14 and a vinyl acetate content of 25% in 400 milliliters of toluene, add 240 milliliters of acrylonitrile monomer and 30 milliliters of triethyl phosphate, and then heat up to 80 °C ± 2 °C , start to drop 100 ml of toluene solution containing 0.6 gram of dicumyl peroxide and 15 gram of trimethylolpropane triacrylate, the time of dropping is about 3 hours, and the total reaction time is 12 hours. Adding 200 grams of concentration after the reaction is 50% Al 2 o 3 / triethyl phosphate slurry and stirred for 2 hours. The reaction product is scraped on the glass plate or directly coated on the carbon negative electrode sheet, and the microporous polymer electrolyte membrane or the microporous polymer electrolyte / carbon negative electrode composite electrode sheet is formed after the solvent is volatilized.

[0038] The performance test results of the microporous polymer electrolyte membrane are shown in Table 1.

[0039...

Embodiment 3

[0041] Except that the cross-linking agent is divinylbenzene and the dosage is 10 grams, the same operation as in Example 2 was followed to obtain a polymer electrolyte membrane for lithium-ion batteries. The performance test results are shown in Table 1.

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Abstract

The present invention relates to a composition of polymer electrolyte film for making polymer lithium ion cell and its preparation method. The base material of this polymer electrolyte film is a microporous polymer film which is made up by adopting the following steps: using acrylonitrile, cross-linking agent and small quantity of second monomer and making them produce copolymerization in toluenesolution of ehtylene-vinyl acetate copolymer to obtain polymer blend, then adding Al2O3 or SiO2 filling material, mixing them to obtain compoiste slurry material, then applying said slurry material on the substrate, utilizing solvent volatilization to induce microphase separation to form the microporous polymer film. Its pore size D50 is less than 100 nm, after the electrolyte solution is absorbed by this film, it has high strength and good electrohydraulic retentivity, the volume swelling degree of said film is less than or equal to 30.0%.

Description

technical field [0001] The present invention relates to a polymer electrolyte membrane material and a preparation method thereof, more precisely a polymer electrolyte membrane material and a preparation method thereof for energy storage and energy conversion devices such as lithium-ion batteries, electric double-layer capacitors, and photoelectrochemical cells . Background technique [0002] Lithium-ion battery is a new type of high-performance rechargeable battery with high energy-to-weight ratio and no memory effect. It is widely used in portable electronic products such as mobile phones, cameras, and laptops. The separator of the usual lithium-ion battery is polypropylene microporous membrane (PP) or polyethylene / polypropylene composite microporous membrane (PE / PP). Since the PP or PE / PP membrane has poor ability to hold the electrolyte solution, the battery exists With the disadvantage of easy leakage, the leakage of the battery leads to a decrease in battery capacity a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08J5/18C08L23/08H01M10/02
CPCY02E60/10
Inventor 邓正华郑维忠陈勉忠万国祥张晓正陈效民翟俊何广冀
Owner SICHUAN INDIGO TECH CO LTD
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