Thanks to this open source chemist we may soon have graphene super capacitors that safely outperform lithium based batteries in every way.
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Reddit comment explains like I'm five:
He's created a graphene / aluminum air battery that's rechargeable. It's the rechargeable part that is important for obvious reasons but also because it's very hard to make an aluminum based rechargeable battery that survives more than a few recharges. The Graphene is combined with rubber derived from milk plus a little sulfur thrown in for flexibility. I think he uses chitin derived from shellfish too. The aluminum is soaked in hydrochloric acid for a bit to make it porous and increase the surface area tremendously.