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such as silk fibroin [26], polyvinyl alcohol (PVA) [27], eggshell [28], chitin [29] and cellulose [30] have been used for separator membranes, but the most commonly used polymers are synthetic polymers, such as, poly(ethylene) (PE) [31], poly(propylene) (PP) [32], poly(ethylene oxide (PEO) [33, 34], poly(acrylonitrile) (PAN) [33, 35], poly(vinylidene fluoride) and its copolymers (PVDF-TrFE and PVDF-co-hexafluoropropylene, PVDF-HFP ) [36-39]. In addition to these polymers, other synthetic polymers such as polyimide (PI) [40], poly (ether ether ketone) (PEEK) [41], polyetherimide (PEI) [42], polybenzimidazole (PBI) [43] and poly (m-phenylene) isophthalamide) (PMIA) [44] have been used to increase the thermal stability of the separator membranes, among other relevant parameters. Regarding the processing techniques, separator membranes can be obtained through different techniques, the most used ones being e wet and dry processes [45, 46], including solvent casting, phase inversion, including thermally induced phase separation (TIPS) [47] and non- solvent induced phase separation (NIPS) [48], electrospinning [49] and particulate leaching [50], among others [51]. Further, efforts are also devoted to improve the surface properties of the separator membrane, such as wettability, compatibilization with electrodes or ionic conductivity, through surface treatments such as coating, grafting, plasma or electron beam treatments [23, 52]. 3. Membrane preparation techniques Together with materials selection, choosing the production technique is also paramount to control the physical-chemical properties and morphology of the materials. The final application also determines the requirements and specificities of the material, and consequently, the more appropriate technique to achieve such needs. Polymers are well known for their easy processability and for the many methods that allow producing very different structures. The polymeric membranes produced as separators for Li-ion batteries are no 5PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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