The Effect of Sodium Acetate and Trisodium Citrate Dihydrate Composite Additives in the Electrolyte of Magnesium-Air Batteries
Magnesium air battery has many advantages such as high energy density,simple structure,and environmental friendliness.However,the reason why it has not been commercially applied on a large scale so far is that its high theoretical electrochemical performance has not been effectively released.This work found that sodium acetate and trisodium citrate can be used as a good combination of additives for the electrolyte of magnesium air batteries,which can significantly improve the discharge performance of magnesium air batteries.It has been confirmed that the battery with this combination added to the electrolyte can maintain a stable discharge voltage at a current density of up to 50 mA/cm2.This additive combination can increase the energy density of magnesium by 10％～15％,reaching around 1900 Wh/kg,which is close to 30％of the theoretical energy density of magnesium air batteries.The corrosion inhibition rate of the electrolyte also exceeds 95％,reducing the loss of raw materials caused by the reaction between the magnesium and the aqueous solution.In addition,this additive combination can also optimize the morphology of precipitates from the original gray black block like aggregates to white dispersed granular precipitates,effectively avoiding the accumulation of products and ensuring that the discharge performance does not decrease due to the accumulation of precipitates.
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