Heat activated microporous membrane and its application in battery

A microporous membrane and battery technology, applied in the field of microporous membranes, can solve the problems of low battery high-current charge and discharge performance, easy changes in battery quality, and weak adhesion between the separator and the electrode, etc.

Inactive Publication Date: 2003-09-03
POLICELL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this will lead to a decrease in the high-current charge and discharge performance of the battery.
In addition, the adhesion between the separator and the electrodes is not strong, so the quality of the battery is easy to change
Especially for batteries with large sizes like those that can be used in electric vehicles, the situation will be more serious

Method used

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  • Heat activated microporous membrane and its application in battery
  • Heat activated microporous membrane and its application in battery
  • Heat activated microporous membrane and its application in battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A microporous membrane was prepared as follows. 0.90 g of poly(ethylene-vinyl acetate) "PEVA-50" containing 50% vinyl acetate, 0.36 g of Escorez® 2596 (aromatized modified aliphatic hydrocarbon resin), and 4.14 g of polysulfone (Mw. 80,000) produced by Scientific Polymer Products (Ontario, NY) were dissolved in 40 g of tetrahydrofuran "THF". Another 1.00 g of fumed silica was added to the above solution. After stirring overnight, 7.00 g of lithium bromide "LiBr" was added to the resulting slurry. After the lithium bromide had completely dissolved, the slurry was coated directly onto a 4 inch by 15 inch Mylar(R) (polyethylene terephthalate) film support at room temperature. Coating thickness is controlled at about 200 microns. The whole pot of slurry can coat 10 pieces. At room temperature, tetrahydrofuran evaporates within about half an hour. After the tetrahydrofuran was completely volatilized, the obtained membrane was immediately soaked in water for 1 hour. The...

Embodiment 2

[0042] This sample is listed in Table 1, Sample No. 2. It was prepared according to the method of Example 1 above with the same formulation and substantially the same materials. The difference was that Escorez(R) 5690 (cycloaliphatic hydrocarbon resin) manufactured by Exxon-Mobil Chemical Company (Houston, TX) was used in place of Escorez(R) 2596 (aromatized aliphatic hydrocarbon resin).

Embodiment 3

[0044] Sample No. 3 was prepared from substantially the same slurry as in Example 2. The difference is that "PEVA-50" is replaced by poly(ethylene-vinyl acetate) "PEVA-70" containing 70% vinyl acetate.

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Abstract

PROBLEM TO BE SOLVED: To provide a porous membrane for use in fabricating a storage battery, and to provide a method for manufacturing the same.SOLUTION: The porous membrane comprises: (a) a hot melt adhesive agent such as poly(ethylene-vinyl acetate) or a poly(ethylene-alkyl acrylate) (b) an engineering plastic such as polysulfone, polycarbonate, or poly(styrene-methyl methacrylate). The membrane may also contain as required: (c) an adhesiveness providing agent such as an aromatically modified aliphatic hydrocarbon resin, aliphatic resin, hydrogenated alicyclic hydrocarbon resin, rosin resin, polyterpene resin, or PVdF-HFP; and/or (d) a filler such as fumed silica, alumina, titanium dioxide, molecular sieve, calcium carbonate, calcium silicate, glass, ceramic material, or polytetrafluoroethylene. The membrane is bonded to battery electrodes by thermal activation at approximately 35-125 °C and approximately 0.5-100 psi.

Description

[0001] The priority of this patent application is based on two US patent applications, Ser. Nos. 10 / 034,388 and 10 / 034,494. Field of the invention [0002] The invention relates to a microporous membrane and a production method of the microporous membrane. More specifically, the present invention relates to the application of the microporous membrane in batteries. In the particular case of the present invention, microporous membranes are separators for batteries. Background of the invention [0003] Electric vehicles such as cars, buses and trucks do not emit any exhaust gas into the atmosphere and therefore do not pollute the environment. The energy used to drive this electric locomotive is a set of batteries. In addition to the batteries themselves, the battery pack also includes a charger that can be charged directly from a normal AC power source. However, the range that such electric scooters can travel on a charge is currently limited. The reason is that the energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26B29C70/00C08J5/22H01M2/14H01M2/16
CPCY02E60/10
Inventor 孙录应
Owner POLICELL TECH
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