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6. Conclusions In recent years, and due to society continuous technological development, battery systems have been increasingly being used in portable devices and electric vehicles. From the global battery market, lithium-ion batteries stand out from other systems as they are lighter, cheaper, show higher energy density, no memory effect and low less charge lost (self- discharge). The battery separator is essential in lithium-ion batteries. It is typically composed by a porous membrane and an electrolyte, separating the anode and cathode, and controlling the number and mobility of the lithium ions, affecting, therefore, cycling behavior of the battery. Basically, the porous membranes for the battery separator are based on synthetic polymers and the most commonly used are PVDF and its copolymers and polyolefins (PP and PE). Recently, research work on these polymers has been focusing on the use of new processing techniques to control morphology and surface treatment / modification. In addition, novel polymers are being investigated to improve thermal resistance in order to solve thermal leakage. Considering the relevant role of battery separators in lithium-ion battery systems, many scientific efforts are still needed for the development of new multifuntional porous membranes based on synthetic polymers with improved high ionic conductivity value, excellent thermal and mechanical properties and, consequently, high cycling behavior at high C-rates. Acknowledgments Work supported by the Portuguese Foundation for Science and Technology (FCT) in the framework of the Strategic Funding UID/FIS/04650/2019, UID/QUI/50006/2019, UID/QUI/0686/2016 and UID/EMS/00151/2019. The authors thank FEDER funds through the COMPETE 2020 Programme and National Funds through FCT under the project PTDC/FIS-MAC/28157/2017, Grants 37PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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