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not affect pore structure and this separator features superior wettability, ionic conductivity and cell performance [139]. In order to solve the thermal runaway, alumina coating has been performed leading to separators with improved safety and performance characteristics compared to the pristine polymeric separators [140]. Another strategy to improve the Li+ transference number (tLi+) was to produce a nanocomposite separator fabricated via the functionalization of a glass fiber (GF) separator with a metal–organic framework (MOF). The open metal sites in the MOF serve as the anchoring sites for anions, and the resulting tLi+ is increased by 100% as shown in Figure 5.11 [131]. Figure 5.11 - Schematic illustrations of (a) glass fiber (GF) and (b) the MOF-GF composite separator (MOG) and (c) an enlarged view showing ion transport behavior in MOG [131]. This separator functionalized with MOFs enables the stable operation of Li metal anodes and improves the electrochemical performance [131]. The same approach was used with MOFs but in PVA composite membranes, leading to an enhancement of the electrode reaction kinetics and a reduction of the interface resistance between the electrolyte and the electrodes [141]. A new vapor-induced phase separation method was used for preparing poly (ether ether ketone) (PEEK) membranes with different pore structures as shown Figure 5.12. 35PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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