Adhesive-carrying porous film for cell separator and its application

A technology for battery separators and porous membranes, which is applied to battery components, circuits, electrical components, etc., can solve problems such as insufficient strength, small thermal shrinkage, and unimproved thermal shrinkage, and achieve good safety effects

Inactive Publication Date: 2006-05-10
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The porous membrane obtained by this method does not cause melting or membrane rupture even in a high-temperature environment, and is good in heat resistance. However, contrary to the above-mentioned method, since it is not stretched in the manufacturing process,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (Production of Porous Membrane A)

[0084] 8% by weight of norbornene ring-opening polymer (polynorbornene) powder (Nippon Zeon Co., Ltd. product (Nanosolex) NB, weight average molecular weight greater than or equal to 2 million), 12% by weight of thermoplastic elastomer (Sumitomo Chemical Industry Co., Ltd. TPE824) and 80% by weight of ultra-high molecular weight polyethylene resin with a weight-average molecular weight of 3,500,000, 16 parts by weight of polyethylene resin composition and 84 parts by weight of liquid paraffin are mixed into a slurry, and the The kneader performed dissolution and kneading at a temperature of 160° C. for about 1 hour. Then, the obtained kneaded product was sandwiched between metal plates cooled to 0° C., and rolled into a sheet shape while cooling. Then, hot pressing was performed at a temperature of 115° C. until the sheet had a thickness of 0.5 mm, and further biaxially stretched vertically and horizontally 4.5×4.5 times at the same ...

Embodiment 2

[0113] (Production of porous membrane B)

[0114] A mixture of 6% by weight of norbornene ring-opening polymer (polynorbornene) powder (Nippon Zeon Co., Ltd. (ノ一ソレツクスNB), weight-average molecular weight greater than or equal to 2 million) and 94% by weight of weight-average molecular weight 20 parts by weight of a polyethylene resin composition composed of 3 million ultra-high molecular weight polyethylene resin and 80 parts by weight of liquid paraffin are mixed into a slurry, and dissolved and kneaded for about 1 hour at a temperature of 160°C using a small kneader . Then, the obtained kneaded product was sandwiched between metal plates cooled to 0° C., and rolled into a sheet shape while rapidly cooling. Next, hot pressing was performed at a temperature of 117° C. until the sheet had a thickness of 0.5 mm, and the sheet was further biaxially stretched vertically and horizontally by 3.8×3.8 times at the same temperature, and then desolvated using heptane. The thus-obtained...

Embodiment 3

[0118] Using 2 parts by weight of diphenylmethane diisocyanate to replace 3 parts by weight of 3-functional isocyanate formed by the addition of 3 parts by weight of hexamethylene diisocyanate and 1 part by weight of trimethylolpropane in Example 1 to prepare a reactive polymer Composition, in the same manner as in Example 1, the surface and the back of the porous membrane A were coated with the composition in spots on 30% of the area, and then the porous membrane was placed in a thermostatic chamber with a temperature of 50°C. On the first day, a porous membrane A loaded with a partially cross-linked adhesive with a gel percentage of 35% was obtained.

[0119] Using the thus obtained porous membrane A loaded with a partially cross-linked adhesive, a negative electrode / separator / positive electrode laminate was obtained in the same manner as in Example 1, and a coin-shaped lithium ion secondary battery was assembled in the same manner as in Example 1 using this laminate. The di...

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Abstract

According to the present invention, the following adhesive-loaded porous membrane is provided: using a needle probe type thermomechanical analyzer, a probe with a diameter of 1 mm is placed on the porous membrane under a load of 70 g, and the temperature is raised from room temperature at a rate of The porous membrane was heated at 2°C/min to measure its thickness, and a porous membrane at a temperature equal to or higher than 200°C when the thickness of the porous membrane became 1/2 of the thickness when the probe was placed at this time was used as a base material A porous membrane, a partially crosslinked adhesive formed by reacting a polyfunctional isocyanate with a reactive polymer having a functional group capable of reacting with an isocyanate group is supported on the porous membrane of the base material, and a part of it is crosslinked to form a battery Adhesive-loaded porous membrane for separators. Such a porous film (separator) is temporarily bonded to the electrodes to form an electrode/separator laminate. By using this laminate in the manufacture of batteries, there is no mutual slippage between the electrodes and the separator, and batteries can be manufactured efficiently. Moreover, the porous membrane (separator) itself does not melt or break at high temperature after the battery is manufactured, and also plays the role of a separator with little heat shrinkage.

Description

technical field [0001] The present invention relates to the manufacturing method of the following adhesive-loaded porous film for battery separators (Separe-ta) and batteries using such an adhesive-loaded porous film. In the production of batteries, at the same time, in the batteries thus produced, the porous film carrying the adhesive will not melt or break even in a high temperature environment, and it also functions as a separator with small thermal shrinkage, so it is safe in terms of safety. is good. Background technique [0002] Conventionally, as a method of manufacturing a battery, for example, as described in JP-A No. 09-161814 or JP-A No. 11-329439, the following method is known: a positive electrode and a negative electrode are sandwiched and laminated. A separator for preventing short circuits between these electrodes, or a positive (negative) electrode, a separator, a negative (positive) electrode, and a separator are sequentially laminated and wound to form an...

Claims

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Application Information

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IPC IPC(8): H01M2/16B32B27/32
CPCY02E60/10Y02P70/50
Inventor 市川智昭喜井敬介植谷庆裕山本一成萨摩道夫山口睦子
Owner NITTO DENKO CORP
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