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Microporous member, method for producing same, battery separator, and resin composition for nonaqueous electrolyte secondary battery separator

A technology of resin composition and microporous membrane, which is applied in the direction of battery pack parts, circuits, electrical components, etc., can solve the problem of insufficient thermal shrinkage resistance of microporous membranes, and achieve the effect of excellent thermal shrinkage resistance

Inactive Publication Date: 2015-04-29
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal shrinkage resistance of this microporous membrane is insufficient, and further improvement is required.

Method used

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  • Microporous member, method for producing same, battery separator, and resin composition for nonaqueous electrolyte secondary battery separator
  • Microporous member, method for producing same, battery separator, and resin composition for nonaqueous electrolyte secondary battery separator
  • Microporous member, method for producing same, battery separator, and resin composition for nonaqueous electrolyte secondary battery separator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8、 comparative example 1～3

[0172] The polyphenylene sulfide resin, polyolefin resin-1, and thermoplastic elastomer shown in Tables 1 to 3 below were uniformly mixed in a tumbler to form a compounded material. After that, the above-mentioned compounded materials were put into a twin-screw extruder with a vent port (manufactured by Japan Steel Works "TEX-30"), and melted and kneaded (resin component discharge rate 20kg / hr, screw speed 350rpm, the ratio of the discharge rate of the resin component is 0.057 (kg / hr / rpm), the maximum torque is 60 (A), the set resin temperature refers to the following table 1-3 "Process 1: Cylinder temperature", the mold hole diameter is 3mm ), and then, the aperture of the mold (nozzle diameter) and the diameter of the strand (that is, the diameter of the strand) are collected in the form of Table 1-3 "Mold Aperture / Strand Diameter", and the strand is prepared at the same time, cut off, and the resin is obtained Granules of the composition. In addition, the strand diameter i...

Embodiment 9～16、 comparative example 4～6

[0190] The polyphenylene sulfide resin, polyolefin resin-1, and thermoplastic elastomer shown in Tables 4 to 6 below were uniformly mixed in a tumbler to form a compounded material. After that, the above-mentioned compounded materials were put into a twin-screw extruder with a vent port (manufactured by Japan Steel Works "TEX-30"), and melted and kneaded (resin component discharge rate 20kg / hr, screw speed 350rpm, the ratio of the discharge rate of the resin component is 0.057 (kg / hr / rpm), the maximum torque is 60 (A), the set resin temperature refers to the following table 4-6 "Process 1: Cylinder temperature", the mold hole diameter is 3mm ), and then collected in the manner of Table 4-6 "die diameter / strand diameter", and prepared strands at the same time, cut to obtain pellets of the resin composition.

[0191] Next, the pellets of the resin composition obtained in the aforementioned process, the polyolefin resin-2 described in Tables 4 to 6, and the pore forming agent (li...

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Abstract

Provided are: a microporous membrane which contains a polyolefin and a thermoplastic resin (a) having a melting point of 220°C or more, said thermoplastic resin (a) having a needle-like structure; and a method for producing the microporous membrane. Since this microporous membrane uses a polyolefin and a high-melting-point thermoplastic resin having a needle-like structure, this microporous membrane has excellent thermal shrinkage resistance. Consequently, there can be provided a nonaqueous electrolyte secondary battery separator, especially a single layer separator for nonaqueous electrolyte secondary batteries, which has excellent shut-down function and thermal shrinkage resistance.

Description

technical field [0001] The present invention relates to a microporous membrane, particularly a microporous membrane for a nonaqueous electrolyte secondary battery separator, a method for producing the same, and a resin composition for a nonaqueous electrolyte secondary battery separator. Background technique [0002] As electronic devices become cordless and portable, nonaqueous electrolyte secondary batteries represented by lithium ion secondary batteries with high electromotive force and low self-discharge have attracted attention as power sources for driving them. In recent years, especially with the promotion of higher energy density, the adoption not only in conventional electronic equipment applications but also in automotive applications has rapidly increased, and further safety assurance is required. [0003] In the non-aqueous electrolyte secondary battery, there is a separator between the positive electrode and the negative electrode in order to prevent short-circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/26C08J9/00H01M2/16H01M50/403H01M50/406H01M50/414H01M50/489H01M50/494
CPCC08J5/18C08J2323/00C08J2323/02C08J2333/14C08J2351/00C08J2381/04Y02E60/10H01M50/44H01M50/403H01M50/406H01M50/414H01M50/494H01M50/489C08J9/0061
Inventor 丸山丰川村聪
Owner DIC CORP
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