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Method and device for diaphragm pretreatment

A pretreatment and diaphragm technology, applied in electrical components, circuits, battery pack components, etc., can solve problems such as poor wettability, unpainted, and wavy diaphragms, so as to improve wettability, improve flatness, and improve dyne effect of value

Pending Publication Date: 2018-09-25
JIANGSU ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the hydrophobicity of the surface of conventional separators, when coating inorganic materials, the wettability is poor, and it is prone to defects such as missing coating or failure to coat.
[0005] Moreover, due to the influence of the film-making process of the substrate diaphragm, it is easy to cause poor wavy edges of the diaphragm. When coating inorganic materials, there will be poor coating leakage, and the diaphragm may curl after coating, resulting in waves and unevenness of the diaphragm. , there are problems such as radians after cutting

Method used

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  • Method and device for diaphragm pretreatment
  • Method and device for diaphragm pretreatment
  • Method and device for diaphragm pretreatment

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0053] Preparation Example 1: Preparation of Ceramic Slurry

[0054] The composition of the ceramic slurry is deionized water, aluminum oxide, styrene-butadiene rubber, and polyacrylamide, and the ratio is 70%: 27%: 2.7%: 0.3% (weight ratio).

[0055] First, add alumina and styrene-butadiene rubber into deionized water, stir in a planetary ball mill at 30°C, revolution at 20rpm, and rotation at 1200rpm for 2h, then add polyacrylamide, and stir in a planetary ball mill at 30°C, revolution at 20rpm, and rotation at 1200rpm Stir for 0.5h to obtain a ceramic slurry.

Embodiment 1

[0057] exist figure 1 The shown membrane pretreatment device is filled with ethanol liquid (solvent), and polyacrylic acid (1% solute concentration) is also added to it, which constitutes a heat transfer medium. A 12 μm thick PE separator purchased from Suzhou Jieli New Energy Materials Co., Ltd. figure 1 In the stretching device, it is unwound through the unwinding roller, and then wound up to the rewinding roller after passing through the middle flattening roller. Heat the heat transfer medium composed of ethanol solution containing 1% polyacrylic acid to 40°C through the heating system, adjust the stretching device so that the tension in the winding and unwinding process is 15N, and the winding and unwinding speed is 30m / min.

Embodiment 2

[0059] The diaphragm was pretreated in the same manner as described in Example 1, except that the device described in Example 2 was used to fill the diaphragm pretreatment device with ethanol+polyvinyl alcohol solution.

[0060] The treated separator was then coated with the ceramic slurry described in Preparation Example 1.

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Abstract

The invention relates to a method and device for diaphragm pretreatment. The method comprises: a) unwinding a substrate diaphragm from a discharge roller, b) making the discharged substrate diaphragmto pass through an intermediate flattening roller under action of a liquid heat transfer medium, and c) winding the substrate diaphragm treated by the liquid heat transfer medium to a receiving roller, wherein the liquid heat transfer medium is least one of deionized water, ethanol, propanol, butanol, N-methylpyrrolidone, dimethylacetamide, N, N-dimethylformamide and dimethyl sulfoxide and has a temperature of 20 to 80 DEG C. The diaphragm is pretreated by the liquid heat transfer medium so that the flatness of the diaphragm is improved at a relatively low temperature. The diaphragm is subjected to surface modification under the action of the liquid heat transfer medium so that the Dyne value of the diaphragm is improved, the wettability of the diaphragm to the later coating is improved and the good coating effects are obtained.

Description

technical field [0001] The application relates to a membrane pretreatment method and device. In particular, the present application relates to a method and apparatus for pretreatment of a membrane with a liquid medium. Background technique [0002] With the development of science and technology, human beings have higher and higher demands on energy. Among the energy sources used in portable devices, lithium-ion batteries have attracted extensive attention due to their high energy density and other advantages. As one of the core materials in the battery, the properties of the separator will greatly affect the performance of the lithium-ion battery. [0003] With the increasing capacity of lithium-ion batteries, their safety has gradually attracted people's attention. Coating inorganic materials on the surface of the diaphragm can effectively improve the safety performance of the diaphragm. [0004] However, due to the hydrophobicity of the surface of conventional separator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M50/403
CPCH01M50/403Y02E60/10
Inventor 杨浩田王晓明刘勇标黄云
Owner JIANGSU ADVANCED MATERIAL TECH CO LTD
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