were prepared by phase inversion method through controlling retention time to apply for a
lithium ion secondary batteries. Increased membrane porosity with macrovoids was
observed at increasing retention time. Partially intercalated structures of PVdF-HFP/clay
nanocomposite membranes were confirmed by X-ray diffraction (XRD) analysis. PVdF-HFP
membranes containing various kind of clay showed the increase of membrane modulus …