Nonaqueous-secondary-battery separator and nonaqueous secondary battery

A secondary battery, non-aqueous technology, applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of lower manufacturing yield, achieve improved peeling force, sufficient ion permeability, and good slitting Effect

Inactive Publication Date: 2015-05-13
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, if the adhesive porous layer is easily detached from the polyolefin microporous membrane, it will also cause problems such as a decrease in manufacturing yield.

Method used

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  • Nonaqueous-secondary-battery separator and nonaqueous secondary battery
  • Nonaqueous-secondary-battery separator and nonaqueous secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0160] As the polyvinylidene fluoride-based resin, a copolymer (PVDF-HFP) of vinylidene fluoride / hexafluoropropylene=98.9 / 1.1 mol% and a weight average molecular weight of 1.95 million was used. This polyvinylidene fluoride resin was dissolved in a mixed solvent of dimethylacetamide / tripropylene glycol=75 / 25 by weight at a concentration of 5% by weight to prepare a coating liquid. It is coated on both sides of a polyethylene (PE) microporous membrane with a film thickness of 12 μm, a Gurley value of 230 seconds / 100cc, an average pore diameter of 86 nm, and a porosity of 40% in equal amounts on both sides. Acetamide / tripropylene glycol=60 / 30 / 10 weight ratio coagulation solution (30° C.) and solidified. This was washed with water and dried to obtain a separator for a non-aqueous secondary battery in which an adhesive porous layer made of a polyvinylidene fluoride resin was formed on both the front and back surfaces of the polyolefin-based microporous membrane.

[0161] Regardin...

Embodiment 1-2～1-7、 comparative example 1-1～1-3

[0163] Using the membrane shown in Table 1 as the microporous membrane, the coating conditions were adjusted, and the separators for non-aqueous secondary batteries shown in Table 1 were obtained in the same manner as in Example 1-1.

Embodiment 2-1

[0169] As the polyvinylidene fluoride-based resin, a copolymer (PVDF-HFP) of vinylidene fluoride / hexafluoropropylene=98.9 / 1.1 mol% and a weight average molecular weight of 1.95 million was used. This polyvinylidene fluoride resin was dissolved in a mixed solvent of dimethylacetamide / tripropylene glycol=75 / 25 by weight at a concentration of 5% by weight to prepare a coating liquid. It is coated on both sides of a polyethylene (PE) microporous membrane with a film thickness of 9 μm, a Gurley value of 223 seconds / 100cc, a fibril diameter of 162 nm, and a porosity of 35% in equal amounts on both sides. It was solidified in a coagulation solution (30° C.) of acetamide / tripropylene glycol=60 / 30 / 10 weight ratio. This was washed with water and dried to obtain a separator for a non-aqueous secondary battery in which an adhesive porous layer made of a polyvinylidene fluoride resin was formed on both the front and back surfaces of the polyolefin-based microporous membrane.

[0170] Tabl...

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Abstract

A nonaqueous-secondary-battery separator provided with the following: a microporous membrane containing a fibrillar resin; and an adhesive porous layer that is provided on one or both sides of the microporous membrane and contains a fibrillar polyvinylidene-fluoride resin. Either the mean pore diameter determined from the specific surface area of the microporous membrane is between 50 and 90 nm, inclusive, or the fibril diameter determined from the specific surface area of the microporous membrane is between 150 and 350 nm, inclusive.

Description

technical field [0001] The present invention relates to a separator for a nonaqueous secondary battery and a nonaqueous secondary battery. Background technique [0002] Nonaqueous secondary batteries typified by lithium ion secondary batteries are widely used as power sources for portable electronic devices such as notebook computers, mobile phones, digital cameras, and camcorders. Furthermore, in recent years, since these batteries have a feature of high energy density, their application to automobiles and the like has also been studied. [0003] With the miniaturization and weight reduction of portable electronic devices, the external packaging of non-aqueous secondary batteries has been simplified. Initially, a stainless steel battery case was used for the external package, but an external package made of an aluminum case has been developed, and now a flexible package external package made of an aluminum laminate pack has also been developed. In the case of a soft packa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/417H01M50/426
CPCH01M50/426H01M50/417Y02E60/10H01M50/44H01M50/461H01M10/0525H01M50/449H01M50/491
Inventor 岩井亚由美吉富孝西川聪
Owner TEIJIN LTD
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