A breathing battery has been built as part of IBM's Battery 500 project, in which science bods are aiming to produce a car battery that will last 500 miles. Oxygen flows into the main cell of the battery, gets divided into tiny spaces and then reacts with lithium ions to make lithium peroxide and release those all-important electrons.
The battery will even release oxygen when it's recharging. Once the battery has lost its charge, it'll need to be hooked to a power source and that's when the whole process is completely reversed. Clever stuff.
Sadly, we won't see this kind of tech in cars till at least 2020. Scientists need to find a way to bring the weight of the battery down to make sure the car doesn't need to consume masses of oxy-fuel to get started.
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