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4.9 Chemical stability The longevity of the membrane separator is intimately associated with its ability to withstand chemical degradation and loss of mechanical integrity due to the reactivity or even dissolution by the electrolyte. The membrane should be inert to both strong reducing or oxidizing conditions for long periods of time and not produce impurities which may affect the operation of the battery [15, 51]. 4.10 Electrical resistance Membrane separators should exhibit low electrical resistance since it influences decisively battery capacity, rate performance, charge capability and cycle life. The lowering of electrical existence is ensured through high absorption and retention of the liquid electrolyte, which in turns allows the separator being ionic conductive. The ionic conductivities of the membrane separators soaked with the liquid electrolyte should be in the range of 10-3 to 10-1 S/cm at room temperature to ensure a good battery performance. The impedance electrochemical spectroscopy (EIS) is typically used to characterize the electrical resistance of the membrane separators and the ionic conductivity (σi) calculated by the following equation: σi= d Rb where Rb is the bulk resistance obtained by EIS, d is the thickness and A is the electrochemical active area of the membrane [15, 23, 51, 94, 104]. 4.11 Electrochemical stability The electrochemical stability of the membrane separator is of utmost importance for the performance of the battery. It is important that separator being stable in reactive and oxidative 20PDF Image | Synthetic Polymer-based Membrane for Lithium Ion
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