Researchers demonstrating the ability of aluminum to repel oil underwater.
Courtesy of the researchers
A new method can greatly extend the life of inexpensive, compact, lightweight metal-air batteries. Metal-air batteries are one of the lightest and most compact types of batteries available, but they can have a major limitation: When not in use, they degrade quickly, as corrosion eats away at their metal electrodes. Now, MIT researchers have found a way to substantially reduce that corrosion, making it possible for such batteries to have much longer shelf lives.
While typical rechargeable lithium-ion batteries only lose about 5% of their charge after a month of storage, they are too costly, bulky, or heavy for many applications...
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