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Olefin resin microporous film, separator for batteries, battery, and method for producing olefin resin microporous film

A technology of olefin resin and manufacturing method, which is applied in the direction of batteries, secondary batteries, battery pack parts, etc., and can solve problems such as heat shrinkage, positive and negative short circuits, etc.

Inactive Publication Date: 2015-10-14
SEKISUI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, such an olefin-based resin microporous film shrinks significantly in a high-temperature environment, and as a result, there is a possibility of a short circuit between the positive electrode and the negative electrode.

Method used

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  • Olefin resin microporous film, separator for batteries, battery, and method for producing olefin resin microporous film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0154] (extrusion process)

[0155] Will have weight-average molecular weight shown in table 1, number-average molecular weight, pentad fraction, fusing point and extrapolation melting termination temperature (T em ) was supplied to an extruder, and melted and kneaded at a resin temperature of 200°C. Then, the homopolypropylene was extruded into a film form from a T-die installed at the front end of the extruder, and cooled to a surface temperature of 30° C., thereby obtaining a strip-shaped homopolypropylene film (thickness 30 μm, Width 200mm). In addition, the extrusion amount was 10 kg / hour, the film forming speed was 22 m / minute, and the draw ratio was 83.

[0156] (the first maintenance process)

[0157] A wound roll was obtained by winding 100 m of the obtained elongated homopolypropylene film around a cylindrical core having an outer diameter of 96 mm into a roll shape. The winding roll is placed in a hot blast furnace for 24 hours for curing. In the hot blast furna...

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Abstract

An olefin resin microporous film according to the present invention is an olefin resin stretched film comprising an olefin resin, and is characterized by having a long period of 27 nm or more as measured by a small-angle X-ray diffraction method.

Description

technical field [0001] The invention relates to an olefin resin microporous membrane, a battery separator, a battery and a method for manufacturing the olefin resin microporous membrane. Background technique [0002] Lithium-ion batteries have long been used as power sources for portable electronic devices. The lithium ion battery is generally constituted by disposing a positive electrode, a negative electrode, and a separator in an electrolytic solution. For the positive electrode, lithium cobaltate or lithium manganate is coated on the surface of the aluminum foil. For the negative electrode, carbon is coated on the surface of the copper foil. Furthermore, the separator is provided so as to separate the positive electrode and the negative electrode, thereby preventing the short circuit between the positive electrode and the negative electrode. [0003] When charging a lithium-ion battery, lithium ions are released from the positive electrode and enter the negative elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00H01M2/16H01M50/406H01M50/417H01M50/491
CPCH01M2/1653C08J5/18C08J2323/02C08J2323/10B29C48/0018B29C48/08B29K2023/00B29L2031/3468H01M10/0525Y02E60/10H01M50/417H01M50/406H01M50/491H01M50/44H01M2220/30
Inventor 泽田贵彦
Owner SEKISUI CHEM CO LTD