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Separator for nonaqueous secondary battery

A secondary battery, non-aqueous technology, applied in the direction of secondary batteries, battery components, separators/films/membranes/spacers, etc., can solve the problem of insufficient ion permeability, and the porous structure has not been disclosed in detail and other problems, to achieve the effect of excellent heat resistance and ion permeability

Active Publication Date: 2011-08-17
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous structure of the heat-resistant porous layer is not disclosed in detail, and the ion permeability is not sufficient.

Method used

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  • Separator for nonaqueous secondary battery
  • Separator for nonaqueous secondary battery
  • Separator for nonaqueous secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0244] As the polyethylene powder, GUR2126 (weight average molecular weight: 4.15 million, melting point: 141°C) and GURX143 (weight average molecular weight: 560,000, melting point: 135°C) manufactured by Ticona Corporation were used. The ratio of GUR2126 and GURX143 was 1:9 (weight ratio), and they were dissolved in a mixed solvent of liquid paraffin (manufactured by Matsumura Petroleum Research Institute; Sumoil P-350P; boiling point 480°C) and decahydronaphthalene to make poly The ethylene concentration was 30% by weight to prepare a polyethylene solution. The composition of the polyethylene solution is polyethylene: liquid paraffin: decahydronaphthalene=30:45:25 (weight ratio). This polyethylene solution was extruded from a die at 148° C., cooled in a water bath, and a gel-like tape (tape base) was produced. The base tape was dried at 60° C. for 8 minutes and at 95° C. for 15 minutes, and the base tape was stretched biaxially by longitudinal stretching and transverse str...

Embodiment 1-2

[0248] As the polyethylene powder, GUR2126 (weight average molecular weight: 4.15 million, melting point: 141°C) and GURX143 (weight average molecular weight: 560,000, melting point: 135°C) manufactured by Ticona Corporation were used. The ratio of GUR2126 and GURX143 was 2:8 (weight ratio), and they were dissolved in a mixed solvent of liquid paraffin (manufactured by Matsumura Petroleum Research Institute; Sumoil P-350P; boiling point 480°C) and decahydronaphthalene to make polyethylene The concentration was 30% by weight to prepare a polyethylene solution. The composition of the polyethylene solution is polyethylene: liquid paraffin: decahydronaphthalene=30:68:2 (weight ratio). This polyethylene solution was extruded from a die at 148° C., cooled in a water bath, and a gel-like tape (tape base) was produced. The base tape was dried at 60° C. for 8 minutes and at 95° C. for 15 minutes, and the base tape was stretched biaxially by longitudinal stretching and transverse stret...

Embodiment 1-3

[0251] A separator for a non-aqueous secondary battery of the present invention was obtained in the same manner as in Example 1-1 except that magnesium hydroxide (manufactured by Kyowa Chemical Industry Co., Ltd.; Kisuma 5P) having an average particle diameter of 0.8 μm was used as the inorganic filler. In this separator, the coating amount of the heat-resistant porous layer was 5.05 g / m on both sides. 2 , the porosity of the heat-resistant porous layer was 66%. The entire separator had a film thickness of 20 μm, a porosity of 54%, and a piercing strength of 351 g.

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Abstract

The invention aims to provide a separator for nonaqueous secondary batteries, which has both excellent heat resistance and ion permeability in addition to shutdown characteristics. The first embodiment of the separator is a separator for nonaqueous secondary batteries which is composed of a porous composite membrane wherein a heat-resistant porous layer containing a heat-resistant resin is formed on at least one side of a base which is composed of a polyolefin microporous membrane, said separator being characterized in that the membrane resistance (A) of the base, the Gurley value (B) of the base, the membrane resistance (C) of the porous composite membrane and the Gurley value (D) of the porous composite membrane satisfy a specific relation. The second embodiment of the separator is characterized in that the heat-resistant porous layer has an average pore diameter as determined by a mercury intrusion method of 0.1-0.2 [mu]m. The third embodiment of the separator is characterized in that heat-resistant resin fibrils have an average fibril diameter of 10-80 nm and the pores in the heat-resistant porous layer have an average pore diameter of 50-250 nm.

Description

technical field [0001] The present invention relates to a separator for a nonaqueous secondary battery, and particularly relates to a technique for improving the safety of a nonaqueous secondary battery. Background technique [0002] Non-aqueous secondary batteries typified by lithium ion secondary batteries have high energy density and are widely used as main power sources of portable electronic devices such as mobile phones and notebook computers. This lithium ion secondary battery is required to further increase the energy density, but ensuring its safety is a technical problem. [0003] The separator plays an important role in securing the safety of lithium-ion secondary batteries, and polyethylene microporous membranes are currently used in view of having high strength and a shutdown function. Here, the shutdown function refers to the function of blocking the pores of the microporous membrane to block the current when the temperature of the battery rises. This functio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/417H01M50/423H01M50/431H01M50/451H01M50/457H01M50/489H01M50/491
CPCY02E60/12H01M2/1686H01M10/0525H01M2/1666H01M2/1646H01M2/1653H01M2/162Y02E60/10H01M50/44H01M50/431H01M50/417H01M50/451H01M50/457H01M50/491H01M50/489H01M50/423H01M50/414H01M50/449
Inventor 西川聪
Owner TEIJIN LTD
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