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Porous poly(vinylidene fluoride-cotrifluoroethylene) (PVDF-TrFE) separators with different patterned surfaces constituted by arrays of hexagons, lines, zig-zags and pillars microstructures were developed (Figure 5.3) and their influence on battery performance was evaluated. Figure 5.3 - Schematic representation of separators with different patterns -hexagons, lines, zig-zags, pillars and conventional non-patterned– designed to improve battery performance [112]. It was demonstrated that the zig-zag surface micropatterning leads to a higher electrolyte current density (472.6 A.m-2), improved uptake value (262%), and larger ionic conductivity (3.00 mS.cm-1) than the non-patterned separator and micropatterning of separator membranes allow to significantly improve battery performance [112]. A Sb2O3-modified poly(vinylidene fluoride-co-chlorotrifluoroethylene) (PVDF-CTFE) fibrous membrane was produced by electrospinning, leading to a separator with superior wettability toward nonaqueous electrolytes, higher ionic conductivity, lower interfacial resistance and improved electrochemical stability compared to the commonly used polyethylene separator [113]. 27PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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