Abstract
Batteries![Figure][1] Photo of aluminum-air prototype battery PHOTO: BRANDON J. HOPKINS For primary or nonrechargeable batteries, the overall energy density will be limited by any discharge or open-circuit corrosion that occurs during storage. For batteries based on aluminum and air, this longstanding problem has prevented their widespread use and has been challenging to overcome. Hopkins et al. used commercially available components to construct aluminum-air batteries. During standby periods, the electrolyte in the batteries was replaced with oil to protect the electrodes from corrosion, thus preventing energy loss. Science , this issue p. [658][2] [1]: pending:yes [2]: /lookup/doi/10.1126/science.aat9149
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