Yes, our bark-skinned friends are nice and beautiful and we shouldn't mess with them too much. But here's the thing: we already chop them down for paper, so why not use their spare woody meat for batteries too. Like previous attempts at organic energy storage, it all hinges on mimicking photosynthesis. Up to the a third of the biomass of a tree is a pulpy substance called lignin, which is a by-product from paper production and which contains electro-chemically active molecules called quinones.
Engadget, What if trees could be used as batteries?
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