Renewable energies like wind and solar are clean, abundant, and cheap — but notoriously unpredictable. That’s why so much time and money has been pumped into scaling energy storage solutions: we need to keep the lights on even when the wind isn’t blowing or the sun isn’t shining. While lithium-ion batteries have received the bulk of this investment, there’s another kid on the block that could be cheaper and greener. In an ironic twist, the whole system is powered by the same molecule it is attended to fight — carbon dioxide. Imaginatively, it is called the CO2 battery. The way…
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