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Composite membrane as well as preparation method and application of composite membrane

A composite diaphragm and composite material technology, applied in the direction of electrical components, circuits, battery pack components, etc., can solve the problems of unable to meet the needs of power batteries and limit high-temperature performance, and achieve easy-to-implement processes and equipment, good universality, low cost effect

Inactive Publication Date: 2015-06-10
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently produced separator is a single-layer structure, which limits the high-temperature performance and cannot meet the needs of power batteries.

Method used

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  • Composite membrane as well as preparation method and application of composite membrane
  • Composite membrane as well as preparation method and application of composite membrane
  • Composite membrane as well as preparation method and application of composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 1.74kg of γ-methacryloxypropyltrimethoxysilane, 221g of benzoyl peroxide, and 11.9kg of toluene in a reaction kettle, and reflux the oil bath for 6 hours to obtain a clear and slightly viscous solution. At a temperature of 25°C and a humidity of 40-60%, use this solution as a dipping solution to dip-coat a PP porous film for 10s (PP film thickness is 32μm, porosity is 50%, and pore size is 2-500nm), hot air (100°C) for 2 minutes to obtain a composite separator. The scanning electron micrograph of the composite film is shown in figure 1 As shown, the thickness is 32μm, the porosity is 49%, and the pore size is 2nm-2μm.

Embodiment 2

[0024] Fully blend 149g of γ-methacryloxypropyltrimethoxysilane, 18.9g of benzoyl peroxide, and 1.0kg of toluene, and reflux the oil bath for 6 hours to obtain a clear, slightly viscous solution, and then add 13g of γ- Aminopropyltriethoxysilane, continue to stir for 10min. At a temperature of 25°C and a humidity of 40-60%, use this solution as a dipping solution to dip-coat a PP porous film for 10s (PP film thickness is 32μm, porosity is 50%, and pore size is 2-500nm), hot air (100°C) for 2 minutes to obtain a composite separator. The composite membrane has a thickness of 32 μm, a porosity of 49%, and a pore diameter of 2 nm-2 μm.

Embodiment 3

[0026] Fully blend 149g of γ-methacryloxypropyltrimethoxysilane, 18.9g of benzoyl peroxide, and 0.5kg of acetone, reflux the oil bath for 3 hours, then add 0.5kg of toluene and continue to reflux for 3 hours to obtain a clear , slightly viscous solution, then add 13g of γ-aminopropyltriethoxysilane, and continue to stir for 10min. At a temperature of 25°C and a humidity of 40-60%, use this solution as a dipping solution to dip-coat a PP porous film for 10s (PP film thickness is 32μm, porosity is 50%, and pore size is 2-500nm), hot air (100°C) for 2 minutes to obtain a composite separator. The composite membrane has a thickness of 32 μm, a porosity of 49%, and a pore diameter of 2 nm-2 μm.

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Abstract

The invention discloses a composite membrane as well as the preparation method and the application of the composite membrane. The method comprises the steps of: compounding a layer of a heat-resisting porous material on the surface of a polypropylene porous membrane, wherein solidification and pore formation are carried out in a compound process so as to obtain the porous composite membrane. The method aims at the requirements of high safety of a power cell, the process and equipment are easy to realize, the cost is low, and the continuous film making is performed. The speed of making the film is promoted to a high level (single equipment 300 thousand square meter / year) through the optimal combination of solution formulation and processing parameter, and scale production is facilitated; and the composite membrane is good in universality; large-scale production can be performed through a small test and a middle test of a process; and the preparation method is a method which is particularly suitable for a power cell membrane.

Description

technical field [0001] The invention relates to a composite diaphragm and its preparation method and application. Background technique [0002] The dwindling oil resources have seriously restricted the development of the automobile industry. In the existing research on alternative energy sources for vehicle power, pure battery power is an important development direction. Driven by domestic and foreign electric vehicle-related industrial policies, a new round of lithium-ion power battery investment and development boom is taking shape internationally. [0003] The battery separator material is one of the key inner components of the battery. Its function is to separate the positive and negative electrodes of the battery but allow ions to pass through quickly; when the battery is overheated, it blocks the current conduction in the battery through the closed-pore function to realize the safety protection of the battery. In addition, the chemical stability and electrochemical s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16
CPCY02E60/10
Inventor 杨振忠李焦丽张成亮梁福鑫王朝阳
Owner INST OF CHEM CHINESE ACAD OF SCI