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Metal - Air Batteery ( MAB )
Metal - Air Batteery ( MAB )
Lithium
– Li has a higher theoretical specific energy density than other materials
– Li metal is explosively reactive with water and requires a non-aqueous electrolyte
Aluminum
– High energy density
– Impossible rechargeability due to instability of aluminum metal under alkaline electrolyte
Zinc
– Low cost, an abundance of raw material, low equilibrium potential, environmental benignity
Cathode of MAB
Cathode of MAB
Oxygen Reduction Reaction ( ORR )
Anode of MAB
Anode of MAB
Requirements
– High specific surface area
– High electronic conductivity
– Conversion of metal oxide to metal during charge process
Electrolyte of MAB
Electrolyte of MAB
Ion conductivity
– Lithium hydroxide (LiOH) Li+ : 3.869 S/cm2
–Sodium hydroxide (NaOH) Na+ : 5.011 S/cm2
– Potassium hydroxide (KOH) K+ : 7.352 S/cm2
Carbonization in Zn-air battery
2KOH + CO2 → K2CO3 + H2O
KOH + CO2 → KHCO3
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