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This separator shows excellent flame retardance, high ionic conductivity, good electrolyte wettability and superior rate capability [123]. Novel oriented poly(phthalazinone ether sulfone ketone) (PPESK) fibrous membranes were fabricated by electrospinning technique with high porosity (70%), superior electrolyte uptake (525%), low interfacial resistance (268 Ω) with electrodes and excellent ionic conductivity (1.39 mS/cm) [124]. Further advances in the field of separator membranes are based on surface modifications of synthetic polymer membranes to improve specific properties. A multifunctional separator based on the incorporation of functionalized boron nitride nanosheets with negative charged groups onto a commercial Celgard separator has been developed. The boron nitride separator is capable to prevent polysulfide migration through the separator effectively due to strong ion-repelling of negatively charged polysulfides [125]. A heat setting treatment (preset heat setting ratio λ and heat setting temperature Tsetting) on polypropylene separator for Lithium Ion Batteries has been also implemented, leading to a decrease of the ionic conductivity of the separator while increasing the dimensional stability of the membrane [135]. A new BNNT separator was produced through incorporation of thermally and chemically stable BNNTs onto polyolefin (PP) separators via a dip coating process, the morphology being shown in Figure 5.8 [126]. 31PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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