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Power storage device separator

A technology for power storage devices and diaphragms, which is applied in the direction of hybrid capacitor separators, circuits, capacitors, etc., can solve the problems of hindering ion movement, deterioration of strength and durability, and inability to maintain product characteristics, achieving good durability and good heat resistance. Excellent effect of chemical resistance, solvent resistance and ion permeability

Inactive Publication Date: 2011-09-07
TOMOEGAWA PAPER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since all the layers of the prior art separator are formed of natural fibers, in a high-temperature environment in the presence of organic solvents and ionic liquids, the strength and durability of the separator are reduced, resulting in failure to maintain Questions like product features
In addition, since the layers are laminated after being separately papered by a rotary paper machine, a boundary will be formed between the layers, which is also likely to be a cause of hindering ion movement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Fiber A made of polyethylene terephthalate fibers with a fiber diameter of 2.5 μm, a fiber length of 6 mm, and a crystallinity of 55% was fibrillated to a fiber diameter of 0.2 μm and a fiber length of 0.6 mm. The fiber B of fiber B, fibrillation into fiber diameter 0.5 μm, the fiber C that the fiber length 1mm is made of solvent spinning cellulose are dropped into ion-exchanged water according to the mass ratio of 25:60:15 respectively and by the concentration of 0.05% by mass, Disperse in a beater for 30 minutes to obtain a papermaking material composed of a fiber dispersion.

[0091] The above-mentioned papermaking materials were made into wet paper sheets (··········) using a standard type hand papermaking device specified in JIS P8222. Then, after taking out the obtained wet paper sheet from the handsheet machine, it was dried at 130 degreeC with the Yankee dryer, and the separator of this invention was obtained. As physical properties of the obtained separator, t...

Embodiment 2

[0093] Fiber A composed of polyethylene terephthalate fibers with a fiber diameter of 2.5 μm, a fiber length of 6 mm, and a crystallinity of 73% was fibrillated to a fiber diameter of 0.2 μm and a fiber length of 0.6 mm. The fiber B of fiber B, fibrillation into fiber diameter 0.5 μm, the fiber C that the fiber length 1mm is made of solvent spinning cellulose are dropped into ion-exchanged water according to the mass ratio of 25:60:15 respectively and by the concentration of 0.05% by mass, Disperse in a beater for 30 minutes to obtain a papermaking material composed of a fiber dispersion.

[0094] The above-mentioned papermaking materials were sheeted into wet paper sheets using a standard type handsheeting apparatus specified in JIS P8222. Then, after taking out the obtained wet paper sheet from the handsheet machine, it was dried at 130 degreeC with the Yankee dryer, and the separator of this invention was obtained. As physical properties of the obtained separator, the film...

Embodiment 3

[0096] Fiber A made of polyethylene terephthalate fibers with a fiber diameter of 3.2 μm, a fiber length of 6 mm, and a crystallinity of 55% was fibrillated to a fiber diameter of 0.2 μm and a fiber length of 0.6 mm. The fiber B of fiber B, fibrillation into fiber diameter 0.5 μm, the fiber C that fiber length 1mm is made of solvent spinning cellulose are dropped into ion-exchanged water according to the mass ratio of 40:40:20 respectively and by the concentration of 0.05% by mass, Disperse in a beater for 30 minutes to obtain a papermaking material composed of a fiber dispersion. Then, the separator of the present invention was obtained in the same manner as in Example 1. As physical properties of the obtained separator, the film thickness of the separator was 49 μm, and the density was 0.32 g / cm 3 , the air permeability is 15 seconds / 100ml.

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Abstract

Provided is a power storage device separator that is realized in the form of a heat-resistant, solvent-resistant, and dimensionally stable thin film. Also provided is a power storage device separator that can be realized in the form of a thin film and that has excellent ion permeability and low resistance. Shorting between electrodes and self-discharge are unlikely to occur in the latter separator, and in addition, durability is excellent even after long periods of use in high-temperature environments in the presence of organic solvents and ionic solutions.

Description

technical field [0001] The present invention relates to a separator for an electrical storage device, and particularly to a separator for a lithium ion secondary battery, a polymer lithium secondary battery, an electric double layer capacitor, or an aluminum electrolytic capacitor. [0002] This application is based on and claims priority from Japanese Patent Application No. 2008266786 filed on October 15, 2008 and Japanese Patent Application No. 2008-301428 filed on November 26, 2008, the entire contents of which are hereby incorporated by reference. Background technique [0003] In recent years, lithium ion secondary batteries, polymer lithium secondary batteries, electric double layer capacitors and The demand for aluminum electrolytic capacitors has increased significantly. High capacity and high performance of these electric / electronic devices are developing rapidly, and high capacity and high performance are also required in lithium ion secondary batteries, polymer li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/02H01M2/16H01M50/414H01M50/417H01M50/423H01M50/429H01M50/491
CPCY02E60/12H01M2/1626H01G9/02Y02T10/7022H01M2/162Y02E60/13H01G11/52Y10T428/269Y10T428/268Y10T428/249962Y10T428/249921Y10T442/692Y02T10/70Y02E60/10H01M50/44H01M50/4295H01M50/417H01M50/429H01M50/414H01M50/491H01M50/423
Inventor 桥本武司户塚博己高畑正则高梨光吉太田泰广佐野一彦手塚大介
Owner TOMOEGAWA PAPER CO LTD
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