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Separator for electrochemical device, and electrochemical device

A technology for electrochemical components and diaphragms, which is applied in the field of diaphragms for electrochemical components and electrochemical components, can solve safety problems and other problems, and achieve excellent safety effects

Active Publication Date: 2007-10-03
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, the above-mentioned porous resin membrane disclosed in JP-A-2004-241135 is substantially the same as the polymer gel electrolyte membrane, and the electrolyte in the separator is absorbed and held by the cross-linked microparticles and the porous resin membrane. At high temperature, the reaction of the battery is not necessarily inhibited, which is equal to the same problem of safety as the above-mentioned gel electrolyte.

Method used

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  • Separator for electrochemical device, and electrochemical device
  • Separator for electrochemical device, and electrochemical device
  • Separator for electrochemical device, and electrochemical device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] Put 2kg of polyethylene powder (resin A) aqueous dispersion (Mitsui Chemicals Co., Ltd. "Chemipal W-700" (trade name)) and 800g of ethanol in the container, using a disperser, under the condition of 2800r / min Stir for 1 hour to disperse. Add 300g of alumina (Al 2 o 3 ) microparticles (Sumitomo Chemical Co., Ltd. "Misu Corandam AA04" (trade name), heat-resistant temperature: 180° C. or higher, average particle diameter: 0.4 μm, particle size distribution: 0.3-0.7 μm), stirred for 3 hours to form a uniform slurry. A non-woven fabric made of PBT with a thickness of 28 μm (made by Tapil Co., Ltd.) as a porous substrate was passed through the slurry, and the slurry was coated by pull-up coating, and then dried to obtain resin A in the voids of the non-woven fabric. and a 35 μm thick separator of filler particles.

Embodiment 2

[0123] 100g of ethylene-vinyl acetate copolymer (EVA) (the structural unit from vinyl acetate is 34mol%, manufactured by Japan Unika Co., Ltd.) is put into a container together with 6kg of toluene as a solvent, and stirred at room temperature until it is evenly dissolved , to obtain a binder solution. In this binder solution, 1 kg of polyethylene powder ("Fロ-ビ-ズ LE1080" (trade name) manufactured by Sumitomo Seika Co., Ltd., manufactured by Sumitomo Seika Co., Ltd., melting point: 107° C., average particle diameter: 6 μm, particle size distribution: 2 to 15 μm), using a disperser, stirring for 1 hour under the condition of 2800r / min to disperse. 1 kg of polypropylene powder ("PPW-5" (trade name) manufactured by Seishin Co., Ltd.) was added as filler particles, and stirred at 2800 r / min for 3 hours using a disperser to form a uniform slurry. A gap of 50 μm was formed, and the slurry was filled onto a 25 μm thick paper (manufactured by Nippon Advanced Paper Co., Ltd.) and flatte...

Embodiment 3

[0125] 750 g of the same polyethylene powder aqueous dispersion as in Example 1, 200 g of isopropyl alcohol (IPA) and 375 g of polyvinyl butyral (PVB) as a binder (manufactured by Sekisui Chemical Co., Ltd. KX-5" (trade name)), using a disperser, stirred for 1 hour under the condition of 2800r / min to disperse. 300 g of platy boehmite fine particles ("BMM" (trade name) manufactured by Kawai Lime Co., Ltd.) were added as filler particles, and stirred for 3 hours to form a uniform slurry. A nonwoven fabric made of PP with a thickness of 15 μm (manufactured by Nitupon Advanced Paper Co., Ltd.) was passed through the slurry, coated by pull-up coating, and then dried to obtain a separator with a thickness of 20 μm.

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Abstract

An electrochemical device having excellent safety at high temperature is provided by using a separator for an electrochemical device, which is made of a porous film comprising: a porous base ( 5 ) having a heat-resistant temperature of 150 DEG C. or higher and including filler particles ( 3 ); at least one kind of shutdown resin ( 6 ) selected from the group consisting of resin A that has a melting point in a range of 80 DEG C. to 130 DEG C. and resin B that absorbs an electrolyte and swells due to heating, and the swelling degree is increased as the temperature rises; and a binder ( 4 ).

Description

technical field [0001] The present invention relates to an inexpensive separator for an electrochemical element having excellent dimensional stability at high temperature, and an electrochemical element constructed using the separator and safe even in a high temperature environment. Background technique [0002] Electrochemical elements using non-aqueous electrolytes, represented by lithium secondary batteries and supercapacitors, are widely used as power sources for portable devices such as mobile phones and notebook computers due to their high energy density. As the performance of portable devices increases, the capacity of electrochemical devices tends to increase, and it is important to ensure safety. [0003] In current lithium secondary batteries, a polyolefin-based porous film having a thickness of, for example, about 20 to 30 μm is used as a separator interposed between the positive electrode and the negative electrode. In addition, below the thermal runaway (abnorm...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/414H01M50/417H01M50/42H01M50/489H01M50/491
CPCY02E60/122H01M10/4235H01M10/052H01M2/1653H01M2/166Y02E60/10H01M50/446H01M50/417H01M50/491H01M50/489H01M50/414H01M50/42H01M50/443H01M50/434H01M50/44H01M50/46H01M50/449
Inventor 片山秀昭阿部敏浩松本修明喜多房次青山茂夫
Owner MAXELL HLDG LTD
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