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Posted Thu Apr 25 2013: from Stanford, via EurekAlert:
New battery design could help solar and wind power the grid http://apocadocs.com/s.pl?1366898014
... Currently the electrical grid cannot tolerate large and sudden power fluctuations caused by wide swings in sunlight and wind. As solar and wind's combined contributions to an electrical grid approach 20 percent, energy storage systems must be available to smooth out the peaks and valleys of this "intermittent" power - storing excess energy and discharging when input drops.... When discharging, the molecules, called lithium polysulfides, absorb lithium ions; when charging, they lose them back into the liquid. The entire molecular stream is dissolved in an organic solvent, which doesn't have the corrosion issues of water-based flow batteries.... "In initial lab tests, the new battery also retained excellent energy-storage performance through more than 2,000 charges and discharges, equivalent to more than 5.5 years of daily cycles," Cui said.... A utility version of the new battery would be scaled up to store many megawatt-hours of energy.
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