technology being developed. Sounds promising...
team of scientists at Harvard are developing a "flow" storage battery
, based on organic materials rather than traditional metals.
Quick synopsis from the article: "...[T]he Harvard free flow battery relies on the electrochemistry of naturally abundant, inexpensive, small, organic carbon-based "quinone" molecules, which are similar to those that store energy in plants and animals
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Harvard Research Team has Breakthrough on Battery Storage