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POROUS POLYPROPYLENE FILM PRODUCTION METHOD AND POROUS POLYPROPYLENE FILM AND ELECTRICITY STORAGE DEVICE
POROUS POLYPROPYLENE FILM PRODUCTION METHOD AND POROUS POLYPROPYLENE FILM AND ELECTRICITY STORAGE DEVICE
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机译:多孔聚丙烯膜的生产方法以及多孔聚丙烯膜和蓄电装置
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摘要
PROBLEM TO BE SOLVED: To provide a porous polypropylene film production method suitable for a separator for an electricity storage device, and capable of achieving sufficient performance even under a high temperature environment when it is used for the separator for an electricity storage device.SOLUTION: Provided is the porous polypropylene film production method including a step for drawing a non-drawn sheet including a crystal nucleus agent whose average circle-equivalent diameter is 150 nm or less and standard deviation of an equivalent circle diameter is 70 nm or less to at least one axis.
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