Electronic component separator and method for producing the same

A technology of electronic components and manufacturing methods, applied in the direction of electrical components, battery pack parts, hybrid capacitor separators, etc., can solve problems such as short circuit of electrodes, distance from diaphragm film thickness without any consideration, etc.

Active Publication Date: 2005-09-21
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this patent document, no consideration is given to the diameter of the through-hole, the distance between adjacent through-holes, the film thickness of the diaphragm, and the like.
Such a microporous porous resin film made of polyolefin itself has the property that it tends to shrink to a greater or lesser extent in the melting temperature range above the closure temperature, and as a result, there is a problem that a short circuit between electrodes easily occurs.

Method used

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  • Electronic component separator and method for producing the same
  • Electronic component separator and method for producing the same
  • Electronic component separator and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] A vinylidene fluoride homopolymer with a weight average molecular weight of 300,000 is prepared to be dissolved in 1-methyl-2-pyrrolidone, and dibutyl phthalate is added to adjust the vinylidene fluoride homopolymer to a 15% by weight solution . The amount of water contained in this solution measured by the Karl Fischer method was 0.6%. Next, PTFE particles with a primary average particle size of 0.25 μm and a melting point of 320° C. were placed on the surface of a resin film made of polyethylene terephthalate at a rate of 5 g / m. 2 A non-woven fabric with a thickness of 10 μm obtained by supporting only polyethylene terephthalate fibers made of fibers with a melting point of 260°C, and coating the above-mentioned solution on the non-woven fabric by casting method . Next, the solvent in the solution contained in the nonwoven fabric was evaporated by heat to prepare a separator having a thickness of 22 μm in which a porous resin structure made of vinylidene fluoride ho...

Embodiment 2

[0077] In Example 1, a separator for an electronic element was produced in the same manner as in Example 1, except that a nonwoven fabric having a thickness of 15 μm composed only of vinylon fibers having a melting point of 205° C. was used as the porous substrate. When the separator for electronic components is observed with an electron microscope, there are no defects such as pinholes, and the porous resin structure communicates from one side of the porous substrate to the other through the connection of several holes, and the diameter of each hole is smaller than that of the porous substrate. Thickness is small. In addition, no slope of the pore size distribution was observed in the thickness direction of the separator, confirming a homogeneous porous structure in the thickness direction. The pore diameter of the membrane was determined to be 0.8 μm by the bubble point method.

Embodiment 3

[0079] In Example 1, except that the porous substrate is a resin film made of polyethylene terephthalate with a melting point of 200°C, in the vertical direction, only the resin film is used between one side and the other side of the resin film. A separator for electronic components was fabricated in the same manner as in Example 1, except for a 15 μm-thick microporous resin film composed of through-holes without a substantially shielding structure. When the separator for electronic components is observed with an electron microscope, there are no defects such as pinholes, and the porous resin structure is connected and communicated by several holes on one side of the porous substrate to the other side, and the pore diameter of each hole is smaller than that of the microporous porous resin. The thickness of the film is small. In addition, no slope of the pore size distribution was observed in the thickness direction of the separator, confirming a homogeneous porous structure in...

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Abstract

The present invention provides a separator that, when used in a lithium ion secondary battery, polymer lithium secondary battery, aluminum electrolytic capacitor or electric double-layer capacitor, offers desired levels of various practical characteristics, undergoes minimal heat shrinkage even when overheated, and exhibits high reliability and excellent workability. The electronic component separator proposed by the present invention comprises a porous base made of a substance having a melting point of 180° C. or above, and a resin structure provided on at least one side of and / or inside the porous base, and the porous base and / or resin structure contains filler grains.

Description

technical field [0001] The present invention relates to the use in electronic components, namely lithium ion secondary batteries, polymer lithium ion secondary batteries, lithium metal batteries, aluminum electrolytic capacitors or electric dipole layer capacitors, etc. A separator suitable for use in a thermal large-scale lithium-based battery or an electric dipole layer capacitor, and a method for manufacturing the same. Background technique [0002] In recent years, with the increasing demand for electrical and electronic equipment and the development of hybrid vehicles, whether it is industrial equipment or civilian equipment, electronic components such as lithium-ion secondary batteries, polymer lithium-ion secondary batteries, aluminum electrolytic capacitors and The demand for electric dipole layer capacitors is increasing significantly. These electrical and electronic devices are rapidly developing towards miniaturization and high performance. Lithium-ion secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/02H01M50/414H01M50/417H01M50/426H01M50/449H01M50/457H01M50/489H01M50/491H01M50/497
CPCH01M2/1666H01M2/1653H01M2/162Y02E60/13H01M2/1686H01M2/166H01G11/52Y02E60/10H01M50/449H01M50/44H01M50/446H01M50/417H01M50/457H01M50/414H01M50/491H01M50/489H01M50/426H01M50/497H01M50/42H01M50/423H01M50/4295H01M50/437H01M50/434H01M50/463H01M50/443H01M10/0525H01M10/0565H01G9/02
Inventor 户塚博己杉山仁英高畑正则
Owner SUMITOMO CHEM CO LTD
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