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Porous film, battery partition containing said film and non-aqueous electrolytic battery using said partition

A non-aqueous electrolyte and battery separator technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, battery pack parts, etc., can solve the problems of affecting battery electrolyte, weak interface, difficult to fully control reaction conditions, etc. The effect of excellent leakage, excellent permeability and excellent mechanical properties

Inactive Publication Date: 2004-07-14
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the invention described in JP-A-2001-59036, although a porous film with high heat resistance and high mechanical strength is obtained, not only does the use of polynorbornene increase the cost, but also since the porous film passes through a special Reactive synthesis, so there are by-products that may affect the electrolyte used in the battery, etc.
In addition, since it is difficult to sufficiently control the reaction conditions, there is a possibility that a certain segment exists as a foreign substance in which polynorbornene causes cross-linking in a single gel.
Since the interface between this segment and polyolefin is weak, heat resistance and strength may be poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 15 parts by weight of a polymer consisting of 80 wt% of ultra-high molecular weight polyethylene having a weight average molecular weight of 1,500,000 and 20 wt% of EPDM (ethylidene norbornene content: 4 wt%, Esprene512 F, manufactured by SumitomoChemical Co., Ltd.) The composition was uniformly mixed with 85 parts by weight of liquid paraffin in a slurry state, and then the slurry was kneaded with a small-sized kneader at a temperature of 160° C. for about 60 minutes. The kneaded mixture was sandwiched between metal plates at 0°C and quenched into a sheet form. The quenched sheet-like resin was hot-pressed at a temperature of 115° C. until the thickness became 0.4 mm and simultaneously biaxially stretched (4 times in the longitudinal direction (MD) x 4 times in the transverse direction (TD)) at a temperature of 123° C., followed by Extractive work-up was carried out with heptane. The obtained porous membrane was heat-treated at 85° C. for 1 hour in air, and then at 116°...

Embodiment 2

[0074] 15 parts by weight were composed of 73 wt% of ultra-high molecular weight polyethylene having a weight average molecular weight of 1,500,000, 13 wt% of EPDM (ethylene norbornene content: 10 wt%, Esprene505, manufactured by SumitomoChemical Co., Ltd.) and 14 wt% of thermoplastic elastomer (TPE821, manufactured by SumitomoChemical Co., Ltd.) and 85 parts by weight of liquid paraffin were uniformly mixed in a slurry state, and then the slurry was kneaded at a temperature of 160° C. 60 minutes. The kneaded mixture was sandwiched between metal plates at 0°C and quenched into a sheet form. The quenched sheet-like resin was hot-pressed at a temperature of 115° C. until the thickness became 0.4 mm and simultaneously biaxially stretched (4 times in the longitudinal direction (MD) x 4 times in the transverse direction (TD)) at a temperature of 123° C., followed by Extractive work-up was carried out with heptane. The obtained porous membrane was heat-treated at 85° C. for 1 hour...

Embodiment 3

[0076] 15 parts by weight of a polymer consisting of 93 wt% of ultra-high molecular weight polyethylene having a weight average molecular weight of 1,500,000 and 7 wt% of EPDM (ethylidene norbornene content: 9.5 wt%, Esprene 5503, manufactured by Sumitomo Chemical Co., Ltd.) The composition was uniformly mixed with 85 parts by weight of liquid paraffin in a slurry state, and then the slurry was kneaded with a small-sized kneader at a temperature of 160° C. for about 60 minutes. The kneaded mixture was sandwiched between metal plates at 0°C and quenched into a sheet form. The quenched sheet-like resin was hot-pressed at a temperature of 115°C until the thickness became 0.4 mm and simultaneously biaxially stretched (MD 4 times x TD 4 times) at a temperature of 123°C, followed by extraction treatment with heptane. The obtained porous membrane was heat-treated at 85° C. for 1 hour in air, and then at 116° C. for 1.5 hours, whereby a porous membrane was obtained. The porous membra...

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Abstract

A porous film having excellent permeability and mechanical strength and having resistance to film breakage at high temperatures, a battery separator comprising the porous film, and a non-aqueous electrolyte battery using the separator. The porous film comprises a crosslinked material which comprises a polyolefin resin and an ethylene-propylene-diene terpolymer crosslinked therewith.

Description

technical field [0001] The present invention relates to a porous film comprising a polyolefin cross-linked material, a battery separator comprising the porous film, and a nonaqueous electrolyte battery using the same. Background technique [0002] In recent years, since non-aqueous electrolyte batteries including light metals such as lithium have high energy density and little self-discharge, their range of applications has been greatly broadened against the background of advances in performance, miniaturization, etc. of electronic instruments. For electrodes of such a nonaqueous electrolyte battery, a spirally wound pack having a configuration in which a strip-shaped positive electrode, a negative electrode, and a separator are laminated is used to ensure a widely effective electrode. [0003] The separator mainly prevents a short circuit between the two positive and negative electrodes and transports ions due to its microporous structure, thereby initiating the battery rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00C08J5/18C08J9/36C08L23/04C08L23/06C08L23/08C08L23/16H01M10/05H01M10/0566H01M50/403H01M50/414H01M50/489
CPCC08L23/0815C08J5/18C08J2323/04C08L23/06C08L2312/06H01M2/145C08L2312/00H01M2/1653C08L23/16C08L2203/20Y10T428/249953Y10T428/249981Y10T428/249992Y02E60/10H01M50/403H01M50/489H01M50/414C08L2666/04C08L2666/06H01M50/417H01M50/491H01M10/052
Inventor 山本一成江守秀之
Owner NITTO DENKO CORP