Separators play a key role in all batteries. The main function is to keep the positive and negative electrodes apart to prevent electrical short circuits and, at the same time allow rapid transport of ionic charge carriers needed to complete the circuit during the passage of current in an electro-chemical cell. Separators should be very good electronic insulators and have the capability of conducting ions by either intrinsic ionic conductor or by soaking electrolyte. They should minimize any processes that adversely affect the electrochemical energy efficiency of the batteries