POLYOLEFIN MICROPOROUS FILM, SEPARATOR FOR ELECTRICITY STORAGE DEVICE AND ELECTRICITY STORAGE DEVICE

• Main Authors: FUKUNAGA YUKI, SEKIGUCHI MANABU
• Format: Patent
• Language: English; Japanese
• Published: 09.03.2017
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

PROBLEM TO BE SOLVED: To provide a polyolefin microporous film excellent in performance under high temperature when made as a lithium ion secondary battery and other separator for electrochemical device and capable of adding high heat resistant safety, a separator for electricity storage device consisting of the polyolefin microporous film and an electricity storage device using the separator for electricity storage device.SOLUTION: There is provided a polyolefin microporous film having maximum value of differential value in a range of less than a temperature of 10°C lower than the melting point Tm of the polyolefin microporous film (Tm-10°C) of 0.1 or less in a thermomechanical analysis primary differential curve obtained by a thermomechanical analysis measurement in a film width direction of the polyolefin microporous film.SELECTED DRAWING: None 【課題】リチウムイオン二次電池およびその他の電気化学デバイス用セパレータとしたときに高温下での性能に優れ、且つ、高い耐熱安全性を付与できる、ポリオレフィン微多孔膜、該ポリオレフィン微多孔膜からなる蓄電デバイス用セパレータ、及び該蓄電デバイス用セパレータを用いた蓄電デバイスを提供することを目的とする。【解決手段】ポリオレフィン微多孔膜の膜幅方向の熱機械分析測定より得られる、熱機械分析一次微分曲線において、前記ポリオレフィン微多孔膜の融点Ｔｍより１０℃低い温度（Ｔｍ−１０℃）未満の領域における微分値の最大値が、０．１以下である、ポリオレフィン微多孔膜。【選択図】なし