Composite isolation membrane and formation method thereof

A technology of separator and microporous membrane, applied in electrical components, circuits, battery pack components, etc., can solve the problems of high internal resistance, low capacity and poor wettability of batteries

Active Publication Date: 2012-01-11
SHENZHEN SENIOR TECH MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyolefin microporous separator has good mechanical properties and stability in the electrolyte, but due to the non-polarity of polyolefin, the wettability between the separator and the electrolyte is not good, resulting in high internal resistance and low capacity of the assembled battery and other defects

Method used

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  • Composite isolation membrane and formation method thereof
  • Composite isolation membrane and formation method thereof
  • Composite isolation membrane and formation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Get 1g of perfluorosulfonic acid resin (DuPont Nafion) and put it into a container, add a LiOH aqueous solution with a mass concentration of 27%, make the resin fully immersed in the solution, and reflux at 100 ° C for 48 hours to remove the SO in the resin 2 F group converted to SO 3 Li group, fully washed with water until the pH value is neutral, and the functional group obtained is SO 3 Li's perfluorosulfonic acid ion exchange resin with ion exchange function. Weigh the converted resin, place it in a three-necked container (such as a three-necked flask), add the solvent dimethyl sulfoxide, and blow nitrogen to remove the air therein. Heating to above 170°C, insulated and stirred for 2.5 hours to dissolve to obtain a uniform and clear resin solution with a mass concentration of about 5%. Dissolve 0.02g of benzophenone in 20ml of acetone in a beaker, and completely soak the double-layer polypropylene microporous diaphragm (40 microns) in the acetone in which the phot...

Embodiment 2

[0040] Get 1g of perfluorosulfonic acid resin (DuPont Nafion) and put it into a container, add a LiOH aqueous solution with a mass concentration of 27%, make the resin fully immersed in the solution, and reflux at 100 ° C for 48 hours to remove the SO in the resin 2 F group converted to SO 3 Li group, fully washed with water until the pH value is neutral, and the functional group obtained is SO 3 Li's perfluorosulfonic acid ion exchange resin with ion exchange function. Weigh the converted resin, place it in a three-necked container (such as a three-necked flask), add the solvent dimethyl sulfoxide, and blow nitrogen to remove the air therein. Heating to above 170°C, insulated and stirred for 2.5 hours to dissolve to obtain a uniform and clear resin solution with a mass concentration of about 5%. Prepare CrO in a beaker 3 , concentrated H 2 SO 4 and H 2 O The treatment solution with a mass ratio of 1:3:4, completely soak the double-layer polypropylene microporous diaphra...

Embodiment 3

[0042] Get 1g of perfluorosulfonic acid resin (DuPont Nafion) and put it into a container, add a LiOH aqueous solution with a mass concentration of 27%, make the resin fully immersed in the solution, and reflux at 100 ° C for 48 hours to remove the SO in the resin 2 F group converted to SO 3 Li group, fully washed with water until the pH value is neutral, and the functional group obtained is SO 3 Li's perfluorosulfonic acid ion exchange resin with ion exchange function. Weigh the converted resin, place it in a three-necked container (such as a three-necked flask), add the solvent dimethyl sulfoxide, and blow nitrogen to remove the air therein. Heating to above 170°C, insulated and stirred for 2.5 hours to dissolve to obtain a uniform and clear resin solution with a mass concentration of about 5%. Prepare CrO in a beaker 3 , concentrated H 2 SO 4 and H 2 O mass ratio is 1: 5: 10 treatment solution, soak double-layer polypropylene microporous membrane (40 microns) in this ...

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Abstract

The invention provides a composite isolation membrane and a formation method thereof, and the method comprises the following steps: transforming a SO2F group or a H-type sulfonic group in perfluorosulfonate resin into a SO3Li group to obtain a perfluorosulfonate ion exchange resin with a SO3Li functional group; dissolving the obtained perfluorosulfonate ion exchange resin in a solvent to obtain a resin solution; performing surface treatment of a polyolefin micropore diaphragm to obtain a treated micropore diaphragm; soaking the polyolefin micropore diaphragm after surface treatment in the resin solution, taking the diaphragm out and drying to obtain a composite isolation membrane. According to the invention, by combining the perfluorosulfonate ion exchange resin which has a Li ion exchange function after ion transformation with the polyolefin micropore diaphragm after surface treatment, the polyolefin micropore diaphragm is modified; because of the high thermal stability, hydrophilicity, and ion exchange capability of the perfluorosulfonate ion exchange resin, the liquid absorption capacity, heat resistance and ion penetration capability of the isolation membrane are increased.

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 method for forming the composite isolation film. 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 electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/42C08J9/36C08L23/00C08F14/18C08F8/44H01M2/16
CPCY02E60/10
Inventor 陈秀峰陈良杨佳富高东波雷彩红王今刚
Owner SHENZHEN SENIOR TECH MATERIAL
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