Electrochemical analysis and mixed potentials theory of ionic liquid based Metal-Air batteries with Al/Si alloy anodes

摘要: Abstract Aluminium and silicon, when coupled with an air cathode in electrochemical cell may provide theoretical specific energies of up to 8146 mWh/g 8470 mWh/g. Proof concept for the discharge cells ionic liquid EMIm(HF)2.3F electrolyte had been established 2009 silicon 2015 aluminium. The objective present work is investigation behavior corrosion this type using binary Al/Si alloys as anodes. nine different compositions were prepared by arc melting process shaped Microstructure anodes initial state was evaluated respect fractions its constituents. Al/Si–air primary full investigated voltages during OCV intermediate term (20 h) runs under current densities 250 μA/cm2. Voltages decrease Si-content following trends quantitatively characteristics hypoeutectic, hypereutectic high Si content. SEM analysis surface morphology after experiments indicates that all capacity results mostly from oxidation Potentiodynamic polarization measurements conducted order determine potentials analyzed approaches based on mixed potential theory including galvanic coupling. are discussed terms Evans diagrams; thereby alternative scenarios coupling examined.