Synthetic Polymer-based Membrane for Lithium Ion

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Synthetic Polymer-based Membrane for Lithium Ion ( synthetic-polymer-based-membrane-lithium-ion )

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Figure 1.1 - Schematic representation of the main constituents and the discharge process of lithium-ion battery systems. The two main processes of lithium-ion batteries are charging and discharging. During the charging process, for each lithium ion that leaves the cathode and crosses the separator to reach the anode, an electron exits through the external circuit, leading to an electric current and to the charging of the battery. In the discharge process, the movement of electrons and ions is in the opposite direction [11]. The separator separates the anode from the cathode and serves as the medium for the transfer of charges [12-14]. The separator can be constituted by a polymeric matrix in which the membrane is soaked by the electrolyte solution, i.e, a liquid electrolyte where salts are dissolved in solvents, water or organic molecules. Other possibility for the fabrication of polymer electrolyte separators is the incorporation of the lithium salts directly in the polymer matrix [15]. Typically, the liquid electrolyte solution is composed by lithium salts within one or more solvents. The solvents present in the electrolyte solution must meet the requirements 3

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