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Separator for aluminum electrolytic capacitor and aluminum electrolytic capacitor

A technology for electrolytic capacitors and capacitors, applied in the direction of electrolytic capacitors, solid electrolytic capacitors, hybrid capacitor electrolytes, etc., can solve the problems of increasing short-circuit failures of capacitors and reducing the mechanical strength of diaphragms, achieving low ESR, improving liquid retention capacity, and avoiding short circuits glitch effect

Active Publication Date: 2018-05-25
NIPPON KODOSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the heat applied in the carbonization treatment step of the separator causes thermal deterioration of the cellulose fibers, which leads to a decrease in the mechanical strength of the separator
In addition, since cellulose fibers are gradually decomposed under acidic conditions, when a capacitor element is infiltrated with a conductive polymer polymer solution containing an oxidizing agent and an acidic dispersion solution, the mechanical strength of the separator is significantly reduced.
Due to the reduced mechanical strength of the separator, there is an increased possibility of short-circuit failure of the capacitor

Method used

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  • Separator for aluminum electrolytic capacitor and aluminum electrolytic capacitor
  • Separator for aluminum electrolytic capacitor and aluminum electrolytic capacitor

Examples

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Effect test

Embodiment 1

[0099] 20% by mass of semi-aromatic nylon fibers and 80% by mass (CSF 500 ml) of fibrillated cellulose fibers were mixed. Cylinder papermaking was performed using the obtained raw material, and the separator of Example 1 was obtained. The separator has a thickness of 50 μm and a density of 0.60 g / cm 3 , the compressed liquid retention rate was 162%, the water absorption speed was 25mm / min, the transverse liquid absorption was 26mm / (10 minutes), and the content of fine fibers was 0.1%.

Embodiment 2

[0101] 20% by mass of acrylic fibers, 10% by mass of polyester fibers, and 70% by mass (CSF 30 ml) of fibrillated aramid fibers were mixed. Cylinder papermaking was performed using the obtained raw material, and the separator of Example 2 was obtained. The separator has a thickness of 40 μm and a density of 0.30 g / cm 3 , the compressed liquid retention rate was 221%, the water absorption speed was 16 mm / min, the transverse liquid absorption was 6 mm / (10 minutes), and the content ratio of fine fibers was 7.7%.

Embodiment 3

[0103] 75% by mass of semi-aromatic nylon fibers, 20% by mass (CSF 110 ml) of fibrillated cellulose fibers, and 5% by mass of polyvinyl alcohol fibers were mixed. Cylinder papermaking was performed using the obtained raw material, and the separator of Example 3 was obtained. The separator has a thickness of 70 μm and a density of 0.20 g / cm 3 , the compressed liquid retention rate was 289%, the water absorption speed was 9mm / min, the transverse liquid absorption was 12mm / (10 minutes), and the content of fine fibers was 3.6%.

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Abstract

The present invention provides a separator having at least one nonwoven layer and inserted between a pair of electrodes for a solid electrolytic capacitor or a hybrid electrolytic capacitor. The nonwoven layer contains 20 mass% or more of synthetic fibers and has a compression retention rate of 130 % or more; further, the content of fine fibers having a fiber length of 0.05 mm or more and less than 0.2 mm is 0.1 to 8.0%. Preferably, the synthetic fiber is one or more fibers selected from nylon fibers, aramid fibers, acrylic fibers, and polyester fibers. In addition, the nonwoven layer preferably contains 0.1 to 8.0% of fine fibers having a fiber length of 0.05 mm or more and less than 0.2 mm. In the electrolytic capacitor using the separator described above, the liquid retaining capacity of the separator is improved, the amount of the separator holding the conductive polymer is increased, and the ESR is reduced.

Description

technical field [0001] The present invention relates to a separator suitable for an aluminum electrolytic capacitor and an aluminum electrolytic capacitor using the same. Background technique [0002] In recent years, with the digitalization of electronic equipment and automotive electrical equipment, these equipment have been developed to be more functional and high-performance. In addition, the miniaturization of these equipment is also required, and the circuit boards used in the equipment are also required to be miniaturized. . [0003] Aluminum electrolytic capacitors using conductive polymers as cathode materials (hereinafter referred to as "solid electrolytic capacitors") have better ESR (equivalent series resistance) characteristics than aluminum electrolytic capacitors using electrolyte solutions as cathode materials. Miniaturization can therefore be achieved by reducing the number. [0004] In addition, in recent years, various capacitor manufacturers have provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/02H01G9/15H01G11/52H01G11/56
CPCH01G9/02H01G9/151H01G11/52H01G11/56Y02E60/13H01G9/15
Inventor 石休正树越智贵史熊冈弘伦森本健太
Owner NIPPON KODOSHI