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Method for preparing nitrified coating high polymer diaphragm

A high polymer film and high polymer technology, applied in the direction of hybrid capacitor separator, hybrid/electric double layer capacitor manufacturing, electrical components, etc., can solve the problems of poor mechanical properties, increase bonding performance, reduce impedance, The effect of improving electrochemical performance and safety performance

Inactive Publication Date: 2019-05-03
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties of this composite film are relatively poor (Fu Jing et al., Preparation and properties of polyvinyl alcohol / polyvinylpyrrolidone alkaline composite film[J]. Acta Physicochemical Sinica, 2010, 26(10): 2653-2658 .)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Weigh Al(OH) according to the weight ratio of 5:7:10 3 Inorganic powder, polyvinylpyrrolidone, hydroxypropylmethylcellulose. Mix polyvinylpyrrolidone and hydroxypropyl methylcellulose, place in a solution of 5 mol / L nitric acid, heat and stir at 75 °C for 5 min, and spray dry to obtain nitrified microspheres. Add 10g of nitrified microspheres to 250ml of water, then add the weighed Al(OH) 3 Inorganic powder, ultrasonic vibration to produce uniform colloidal liquid. The colloidal liquid was coated on the surface of the polypropylene membrane, and vacuum-dried at 90°C for 20 minutes to prepare a nitrated-coated polypropylene membrane.

[0015] The molecular weight of the hydroxypropyl methylcellulose is 200,000, and the molecular weight of polyvinylpyrrolidone is 100,000.

[0016] The coated polypropylene diaphragm satisfies the following characteristics at the same time: at 1365cm -1 There is an absorption peak of N=O (Lin Shuchang et al., Chemical Analysis, Higher E...

Embodiment 2

[0018] Weigh MgO inorganic powder, polyvinylpyrrolidone, and hydroxypropyl methylcellulose according to the weight ratio of 0.1:1:5. Mix polyvinylpyrrolidone and hydroxypropyl methylcellulose, place in 10mol / L nitric acid solution, heat and stir at 95°C for 5h, and spray-dry to prepare nitrified microspheres. Add 2g of nitrified microspheres into 250ml of water, then add weighed MgO inorganic powder, and ultrasonically vibrate, the prepared mixture is a uniform colloidal liquid. The colloidal liquid was coated on the surface of the polyethylene film, and placed at 50° C. for 48 hours in vacuum to obtain a nitrified-coated polyethylene diaphragm.

[0019] The molecular weight of the hydroxypropyl methylcellulose is 5000, and the molecular weight of polyvinylpyrrolidone is 500,000.

Embodiment 3

[0021] Weigh SiO according to the weight ratio 50:50:50 2 Inorganic powder, polyvinylpyrrolidone, hydroxypropylmethylcellulose. Mix polyvinylpyrrolidone and hydroxypropyl methylcellulose, place in a nitric acid solution with a concentration of 16 mol / L, heat and stir at 60°C for 48 hours, and spray dry to obtain nitrated microspheres. Add 2g of nitrified microspheres to 250ml of water, then add weighed SiO 2 Inorganic powder, ultrasonic vibration, the prepared mixture is a uniform colloidal liquid. The colloidal liquid was coated on the surface of the polyvinyl chloride membrane, and placed at 90° C. for 10 h in vacuum to prepare a nitrified coated polyvinyl chloride diaphragm.

[0022] The molecular weight of the hydroxypropyl methylcellulose is 100,000, and the molecular weight of polyvinylpyrrolidone is 10,000.

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Abstract

The invention relates to a method for preparing a nitrified coating high polymer diaphragm. The method is characterized by comprising the following steps of: mixing polyvinylpyrrolidone with hydroxylpropyl methyl cellulose in a nitric acid solution; heating and stirring the mixed solution for 5 minutes to 48 hours, and obtaining a nitrified microsphere by spray drying; adding the nitrified microsphere to 250 ml of water, adding weighed inorganic powder, and performing ultrasonic oscillation, wherein the prepared mixture is a uniform colloidal liquid; coating the surface of the high polymer diaphragm with the colloidal liquid, vacuum drying the obtained object to prepare the nitrified coating high polymer diaphragm.

Description

technical field [0001] The invention relates to a method for preparing a nitrification-coated polymer diaphragm, in particular to a method for preparing a coated polymer diaphragm that can be used for lithium batteries, lithium-ion batteries, polymer batteries and supercapacitors, and belongs to the field of battery diaphragm preparation technology field. technical background [0002] Lithium-ion batteries are composed of positive electrode, negative electrode, electrolyte, separator, battery case and other components. As one of the important components of lithium-ion batteries, the performance of the separator has attracted much attention. The main function of the separator is to separate the positive and negative electrodes and avoid their electronic short circuit. The separator also provides a channel for lithium ions to move between the positive and negative electrodes. In the battery system, the separator is required not to react with the electrolyte of the battery s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/052H01G11/52H01G11/84H01M50/403H01M50/414
CPCY02E60/10
Inventor 生瑜童庆松席强张雪勤祖国晶高峰张晓红童君开
Owner FUJIAN NORMAL UNIV