Nonaqueous secondary battery separator and non-aqueous secondary battery

一种二次电池、非水系的技术，应用在非水系二次电池用隔膜及非水系二次电池领域，能够解决循环寿命降低等问题，达到粘接性优异、离子透过性优异、循环特性及负荷特性优异的效果

Active Publication Date: 2014-06-25
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the package made of aluminum laminated film is soft, and therefore, in a battery (soft package battery) in which the package is used as an external package, it is easy to cause a gap between the electrode and the separator due to external impact and the expansion and contraction of the electrode accompanying charging and discharging. A gap is formed between, and as a result, the cycle life sometimes decreases

Method used

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  • Nonaqueous secondary battery separator and non-aqueous secondary battery
  • Nonaqueous secondary battery separator and non-aqueous secondary battery
  • Nonaqueous secondary battery separator and non-aqueous secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0208] 〔Production of diaphragm〕

[0209] As the polyvinylidene fluoride resin A, a vinylidene fluoride / hexafluoropropylene copolymer having a composition ratio (molar ratio) of 99.4 / 0.6 was prepared by suspension polymerization.

[0210] As the polyvinylidene fluoride-based resin B, a vinylidene fluoride / hexafluoropropylene copolymer (weight average molecular weight: 470,000) having a composition ratio (molar ratio) of 95.2 / 4.8 was prepared.

[0211] A polyvinylidene fluoride resin obtained by mixing polyvinylidene fluoride resin A and polyvinylidene fluoride resin B at a mass ratio of 60 / 40 was dissolved in a mixed solvent of dimethylacetamide and tripropylene glycol (dimethyl ethylene glycol) Amide / tripropylene glycol=7 / 3 [mass ratio]), the resin concentration was set to 5% by mass to prepare a coating liquid for forming an adhesive porous layer.

[0212] Apply this coating solution equally to both sides of a polyethylene microporous membrane (film thickness 9 μm, Gurley v...

Embodiment 2

[0224] As the polyvinylidene fluoride resin A, a vinylidene fluoride / hexafluoropropylene copolymer having a composition ratio (molar ratio) of 98.6 / 1.4 was prepared by suspension polymerization.

[0225] A separator of Example 2 was produced in the same manner as in Example 1 except that the above resin was used as the polyvinylidene fluoride-based resin A. Thereafter, a test battery of Example 2 was produced in the same manner as in Example 1.

[0226] Table 1 and Table 2 show the physical property values ​​and evaluation results of the separator and test battery of Example 2.

Embodiment 3

[0228] The separator of Example 3 was produced in the same manner as in Example 1 except that the mixing ratio of the polyvinylidene fluoride resin A and the polyvinylidene fluoride resin B was 10 / 90. Thereafter, in the same manner as in Example 1, a test battery of Example 3 was fabricated.

[0229] Table 1 and Table 2 show the physical property values ​​and evaluation results of the separator and test battery of Example 3.

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PUM

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Abstract

The invention provides a nonaqueous secondary battery separator which has a porous substrate, and, provided on one or both surfaces of the porous substrate, an adhesive porous layer which contains a polyvinylidene fluoride resin (A) and a polyvinylidene fluoride resin (B) described below. Polyvinylidene fluoride resin (A): the polyvinylidene fluoride resin contains vinylidene fluoride-derived structural units and hexafluoropropylene-derived structural units, wherein the ratio of hexafluoropropylene-derived structural units to all structural units is 0.5-1.5 mol%. Polyvinylidene fluoride resin (B): the polyvinylidene fluoride resin contains vinylidene fluoride-derived structural units and hexafluoropropylene-derived structural units, wherein the ratio of hexafluoropropylene-derived structural units to all structural units is greater than 1.5 mol%.

Description

technical field [0001] The present invention relates to a separator for a nonaqueous secondary battery and a nonaqueous secondary battery. Background technique [0002] Non-aqueous 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 video cameras. [0003] In recent years, along with the miniaturization and weight reduction of portable electronic equipment, the weight reduction of the external packaging of non-aqueous electrolyte batteries has been demanded. A metal case and a package made of aluminum laminated film have been developed. [0004] However, the package made of aluminum laminated film is soft, and therefore, in a battery (soft package battery) in which the package is used as an external package, it is easy to cause a gap between the electrode and the separator due to external impact and the expansion and contraction of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/02H01M50/119H01M50/426H01M50/491
CPCH01M2/168H01M2/0247H01M10/052H01M2/0285H01M2/1653H01M2/1686H01M10/0525Y02E60/122H01M50/26H01M50/491H01M50/426H01M50/119Y02E60/10H01M50/461H01M50/449H01M50/46H01M50/124C08L27/16C08J5/22H01M2220/30
Inventor 西川聪吉富孝大塚淳弘岩井亚由美
Owner TEIJIN LTD
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