Abstract
Magnesium (Mg)-air battery, which is an important category of metal-air batteries, has been considered as the promising energy storage in various areas as a primary battery. However, low utilization efficiency due to the serious hydrogen evolution of the Mg anode impairs its discharge performance. Herein, we successfully achieve a high-energy-capacity Mg-air battery that reaches record-breaking 2134 ± 88 mAh g−1 and 2279 ± 55 mAh g−1 with magnetron-sputtered Mg50Al50 and Mg30Al70 anodes in a traditional NaCl electrolyte. The superior high capacity of this new battery can be attributed to the suppression of hydrogen evolution without inhibiting the discharge process of the anode.
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