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environments between 0 to 5 V, and this characteristic is typically evaluated by cyclic voltammetry [23]. 4.12 Shutdown A membrane separator must be able to shut down the Li-ion battery in cases of overheating or short circuits before thermal runaway is reached thus avoiding loss of mechanical integrity. Therefore, the separator material should present high temperature melt integrity and mechanical robustness above the shutdown temperature. Typically, the thermal runway temperature of polymer separators is 130 oC. This property is usually examined by differential scanning calorimetry (DSC) or by analyzing resistance variation as a function of temperature for a membrane filled with electrolyte [51, 93, 94]. 5. Recent advances in separator membranes for Li-ion batteries Recently, strong efforts have been devoted to improve the performance of the different types of separator membranes, Table 5.1 showing the separator types, materials and properties for some relevant separator membranes based on synthetic polymers. Many of those works are mainly focusing on improving processing techniques for morphology control and on surface modification to improve thermal stability and other relevant properties, such as interface properties with the electrodes. PVDF is one of the most widely used polymer for battery separators and different approaches have been recently used to improve its properties. Thus, an active-oxide-incorporated separator is proposed and it was observed that the anode/electrolyte architecture with strong CuO/graphene and PVDF-HFP/CuO interactions leads to an anode-separator interface featured with low interfacial resistance and structural integrity with suppression of the volumetric expansion/contraction of the oxide anode in the charge/discharge process [105]. 21PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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