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Limits to Cell Operating Voltages of Electrochemical Capacitors
Published June 10, 2009 by Advanced Automotive Batteries in United States
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Electrochemical Capacitors (ECs) can store electric charges at electrode-electrolyte interface. The performances of ECs depend greatly on many factors like electrode (material derived, pore distribution, surface functionality, etc.), electrolyte (kind of cation and anion, solvent), and additives for the electrode and electrolyte, interfacial conditions between electrode and electrolytic solution, separator, and so on. As electrodes activated carbons (AC) have been widely used as electrode material because of its high specific surface area (1000-2000 m2 g-1), immediate availability, and low cost. For electrolytes, non-aqueous electrolytes consisting of acetonitrile (AN) or propylene carbonate (PC) solutions with tetraethylammonium tetrafluoroborate (Et4NBF4) are used in commercial ECs because they permit wide operating voltage (2.5-2.7 V).