Compound isolating film and formation method thereof

A technology of separator and polymer solution, applied in electrical components, circuits, battery pack parts, etc., can solve the problems of unsatisfactory performance of polymer electrolyte, need to improve mechanical strength, low market share, etc. Liquid capacity and ion penetration capacity, improve the safety of production operations, and reduce the effect of production costs

Inactive Publication Date: 2010-05-05
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of polymer electrolytes is still not ideal, and there are the following problems: 1. The system has poor compatibility with lithium metal electrodes; 2. The mechanical strength needs to be improved, so the current market share of polymer ion lithium batteries in lithium ion batteries is still low. high

Method used

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  • Compound isolating film and formation method thereof
  • Compound isolating film and formation method thereof
  • Compound isolating film and formation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 2.0 g of PEO with an electronic balance, pour it into a flask filled with 100 ml of acetone, and heat and stir it in a constant temperature water bath furnace at 40°C for 3 hours. After the PEO is completely dissolved, transfer it to an ultrasonic disperser Disperse for 30 minutes to make the solution evenly dispersed.

[0032] Soak the polypropylene microporous membrane in the polymer solution prepared above for 15 minutes in an oven at 40°C, take it out, and dry it in a vacuum drying oven at 50°C for 24 hours after the acetone volatilizes at room temperature. After the acetone is completely volatilized, a composite isolation film is formed.

Embodiment 2

[0034] Weigh 1.5 g of PEO with an electronic balance, pour it into a flask filled with 100 ml of acetone, and heat and stir it in a constant temperature water bath furnace at 40°C for 3 hours. After the PEO is completely dissolved, transfer it to an ultrasonic disperser Disperse for 30 minutes to make the solution evenly dispersed.

[0035] Soak the polypropylene microporous membrane in the polymer solution prepared above for 15 minutes in an oven at 40°C, take it out, and dry it in a vacuum drying oven at 50°C for 24 hours after the acetone volatilizes at room temperature. After the acetone is completely volatilized, a composite isolation film is formed.

Embodiment 3

[0037] Weigh 2.0 grams of PEO with an electronic balance, pour it into a flask filled with 100 ml of acetone, and heat and stir it in a constant temperature water bath furnace at 45°C for 3 hours. After the PEO is completely dissolved, transfer it to an ultrasonic disperser Disperse for 30 minutes to make the solution evenly dispersed.

[0038] Soak the polypropylene microporous membrane in the polymer solution prepared above for 15 minutes in an oven at 45°C, take it out, and dry it in a vacuum drying oven at 50°C for 24 hours after the acetone has evaporated at room temperature. After the acetone is completely volatilized, a composite isolation film is formed.

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Abstract

The invention provides a compound isolating film and a formation method thereof. The method comprises the following steps of: dissolving polyethylene glycol oxide in an acetone solvent; dispersing the polyethylene glycol oxide in the acetone solvent to form a polymer solution; soaking a polyolefine microporous film in the polymer solution; taking out the soaked polyolefine microporous film; and drying the polyolefine microporous film to form the compound isolating film. In the method, the acetone solvent is used for compounding the polyethylene glycol oxide and the polyolefine microporous film; and the polyolefine microporous film is modified to obviously enhance the solution absorption capability and the ion penetrating capability of the isolating film. Moreover, the acetone solvent has low price and does not have harm basically, and therefore, the production cost is reduced and the production operating safety is enhanced.

Description

technical field [0001] The invention belongs to the technical field of polyolefin film manufacture, and in particular relates to a composite isolation film and a forming method thereof. Background technique [0002] At present, polyolefin film materials have been applied and developed more and more, and the most widely used one is as the separator material of lithium-ion batteries, which has become one of the key inner components of lithium-ion batteries. The material of the separator has a crucial impact on the performance of the actual battery. The separator itself is not only a poor conductor of electrons, but also allows the passage of electrolyte ions. In addition, the separator material must also have good chemical and electrochemical stability and mechanical properties, and maintain a high degree of wettability to the electrolyte during repeated charge and discharge. The interfacial compatibility between the separator material and the electrode, and the retention of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/414H01M50/417H01M50/449H01M50/489
CPCY02E60/12Y02E60/10
Inventor 陈秀峰高东波陈勇彭燕吴琼
Owner SHENZHEN SENIOR TECH MATERIAL
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