New insight into the discharge mechanism of silicon–air batteries using electrochemical impedance spectroscopy

摘要: The mechanism of discharge termination in silicon–air batteries, employing a silicon wafer anode, room-temperature fluorohydrogenate ionic liquid electrolyte and an air cathode membrane, is investigated using wide range tools. EIS studies indicate that the interfacial impedance between increases upon continuous discharge. In addition, it shown cathode–electrolyte interface several orders magnitude lower than anode. Equivalent circuit fitting parameters difference anode–electrolyte characteristics for different types wafers. Evolution porous surfaces at anode their properties, by means estimated parameters, also presented. Moreover, found potential has highest negative impact on battery voltage, while actually stable invariable along whole period. capacity can be increased significantly mechanically replacing