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Another coating into PP separators was realized with 4A zeolite with the objective to improve wettability and thermal resistance of the separators [137]. Further, PE separators have been coated with a crosslinkable binder in the form of inorganic polyhedral oligomeric silsesquioxane with epoxy functional end groups (ePOSS) leading to a flame retarding property without compromising electrochemical performance [128]. PE separators have been also improved by chemical treatment with benzoyl peroxide (BPO), oxygen containing functional groups such as carbonyl leading to improved ionic conductivity [129]. A surface modification of PE separators has been developed via a simple solution-based coating of graphene oxide (GO) with hydrophilic groups as shown in Figure 5.9 [130]. Figure 5.9 - (a) Photographs of graphene oxide (GO) dip-coating depending on the polarity of GO solution. (b) Schematic illustration of the wettability of the solvent with low surface energy on the conventional hydrophobic separator. (c) SEM image of the GO dip-coated separator. (d) Water contact angle measurement and (e) photograph of large-area wetting feature on the GO dip-coated separator [130]. 33PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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