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2018-07-31. This ‘flow battery’ could power green homes when the sun goes down and the wind stops blowing.

posted Aug 4, 2018, 6:53 PM by Alan Gould
By Robert F. Service, Science Magazine. For GSS Energy use chapter 10. Excerpt: With solar and wind electricity prices plunging, the hunt is on for cheap batteries to store all this power for use around the clock. Now, researchers have made an advance with a flow battery, the type of battery being developed to soak up enough excess wind and solar power to fuel whole cities. They report the discovery of a potentially cheap, organic molecule that can power a flow battery for years instead of days. ...Flow batteries have the same components as the typical lithium-ion cells in your cellphone, but work in a way that allows them to be scaled up to provide megawatts. They have pairs of electrodes that convert energy stored in chemicals into electricity, and electrolytes that ferry charges from one electrode to another. But where conventional batteries package electrodes and electrolytes together in a cell, flow batteries keep them separate. Energy is stored in external tanks of charged liquid electrolytes that can be any size—which makes it easier to store large amounts of renewable power. During use, positive and negative electrolytes are pumped through the electrodes, which extract electricity, a process that is reversed during charging.... http://www.sciencemag.org/news/2018/07/flow-battery-could-power-green-homes-when-sun-goes-down-and-wind-stops-blowing