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Separator for electrochemical element and electrochemical element

A technology of electrochemical components and diaphragms, applied in the direction of electrical components, electrolytic capacitors, battery pack components, etc., can solve problems such as insufficient retention of electrolyte, low wettability of electrolyte, and increased resistance value

Inactive Publication Date: 2018-11-23
NIPPON KODOSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In addition, the separator disclosed in Patent Document 2 is made of a polyolefin-based resin, which has low wettability to the electrolyte, cannot sufficiently hold the electrolyte, and has not solved the problem of increased resistance.

Method used

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  • Separator for electrochemical element and electrochemical element
  • Separator for electrochemical element and electrochemical element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] 100% by mass of solvent-spun cellulose fibers (specifically, lyocell (registered trademark) fibers) as regenerated cellulose fibers were tapped to obtain a raw material with a CSF value of 100 ml. After papermaking this raw material with a fourdrinier paper machine, the resin roll and metal roll were used to perform thickness adjustment treatment with a linear pressure of 0.5kN / cm to obtain a thickness of 20μm and a density of 0.35g / cm 3 diaphragm. The separator of Example 1 had a porosity of 76.7%, an A value of 90.5%, a most probable pore value of 0.70 μm, a B value of 64.9%, and a C value of 76.8%.

Embodiment 2

[0120] 30% by mass of solvent-spun cellulose fibers and 70% by mass of broadleaved tree dissolving pulp (LDP) were mixed and knocked to obtain a raw material with a CSF value of 0 ml. After papermaking this raw material with a fourdrinier paper machine, the resin roll and metal roll were used to perform thickness adjustment treatment with a linear pressure of 1.0kN / cm to obtain a thickness of 30μm and a density of 0.50g / cm 3 diaphragm. The separator of Example 2 had a porosity of 66.7%, an A value of 100%, a most probable pore value of 0.40 μm, a B value of 70.2%, and a C value of 78.5%.

reference example 1

[0122] The solvent-spun cellulose fiber was knocked out to obtain a raw material with a CSF value of 150 ml. After papermaking this raw material with a fourdrinier paper machine, the resin roll and metal roll were used to perform thickness adjustment treatment at a linear pressure of 4.0 kN / cm to obtain a thickness of 30 μm and a density of 0.60 g / cm 3 diaphragm. The separator had a porosity of 60.0%, an A value of 92.0%, a most probable pore value of 0.51 μm, a B value of 55.1%, and a C value of 89.0%.

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Abstract

A separator for an electrochemical element for holding an electrolytic solution is interposed between a pair of electrodes, said separator comprising a nonwoven fabric formed by depositing fibers in asheet configuration. The frequency of nonwoven fabric hole diameters measuring 0.05-1.00 [mu]m is at least 90% for all holes, the frequency of the modal hole value is at least 60% with respect to thefrequency for all sections, and the frequency of the range of the modal hole value + / -10% is at least 75% with respect to the frequency for all sections. It is thereby possible to provide: a separator for an electrochemical element that has adequate shielding properties and reduced thickness, and has particularly exceptional wettability with respect to the electrolytic solution, liquid retentionproperties, and thermal resistance; and an electrochemical element in which the separator is used.

Description

technical field [0001] The present invention relates to a separator for electrochemical elements and an electrochemical element. Background technique [0002] Electrochemical components such as capacitors (condensers, capacitors) and batteries have been used in new fields such as automobile-related equipment in recent years, and the market is expected to continue to expand in the future. [0003] For example, in electric vehicles and hybrid vehicles, lithium-ion secondary batteries are used as power sources, etc., electric double-layer capacitors are used in energy recovery, etc. Aluminum electrolytic capacitors and electric double layer capacitors are used in the control unit (ECU), motor control, battery control, hybrid electric vehicle (HEV) system control, and DC conversion from an external AC power supply. [0004] In such an electrochemical element, a short-circuit failure may directly lead to an accident, and thus high reliability is required. [0005] In electronic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/02H01G11/52H01M2/16H01M50/489H01M50/491
CPCH01G9/02H01G11/52Y02E60/10H01M50/4295H01M50/44H01M50/491H01M50/489H01M50/409H01M50/46
Inventor 福永了一和田典弘田中宏典井河笃
Owner NIPPON KODOSHI