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4.29 wt % LLZO showing significantly enhanced mechanical, thermal and electrochemical performance [108]. Figure 5.2 – Schematic representation of the preparation method and the proposed microstructure of the PVDF-HFP/LLZO composite separator [108]. This separator is very stable in Li/Li symmetrical cells indicating that promotes homogenous Li+ flux and facilitates the suppression of Li dendrite growth [108]. A new separator based on poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) blended with a mixture solution containing poly(ethylene glycol) methyl ether methacrylate (PEGMEMA), vinyl-functionalized Al2O3 nanoparticles (VTMO@Al2O3) as the cross-linker and poly(vinyl pyrrolidone) (PVP) as the pore-forming agent has been developed showing good mechanical strength, excellent thermal stability and stable capacity retention [109]. In order to improve the separator–electrode interface and, thus, to improve operational safety, a novel separator was produced based on nanostructured PVDF–HFP membranes directly deposited on a carbon anode through efficient, scalable electrophoretic deposition (EPD) in a surfactant-free colloidal system [110]. The as-assembled half battery with this approach exhibits ultra-high cycle stability and high discharge capacities [110]. 26PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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