POROUS POLYIMIDE FILM, SECONDARY BATTERY SEPARATOR, AND SECONDARY BATTERY

• Main Authors: NAKADA KOSUKE, KAJIMA YASUNOBU, HIROSE EIICHI, YOSHIMURA KOSAKU, SASAKI TOMOYA
• Format: Patent
• Language: English; Japanese
• Published: 29.07.2021
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

To provide a porous polyimide film excellent in tensile breaking strength and air permeability.SOLUTION: A porous polyimide film includes a plurality of holes. An average flatness rate of the holes is 0.1-0.7. A coefficient of variation of distance between adjacent holes is 0.10-0.40. A front surface and a rear surface are communicated with each other by a range of the holes.SELECTED DRAWING: None 【課題】引張り破断強度及び透気度に優れる多孔質ポリイミドフィルムを提供すること。【解決手段】複数の空孔を有し、前記複数の空孔の平均扁平率が０．１以上０．７以下であり、近接空孔間距離の変動係数が０．１０以上０．４０以下であり、前記複数の空孔の連なりにより表面と裏面とが連通している、多孔質ポリイミドフィルム。【選択図】なし