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Lithium-ion batteries with nanotube electrodes could go longer between charges.
A study says 35 percent of electricity could come from solar and wind–without expensive new backup power plants.
Utilities are installing devices that make ice at night to replace air-conditioning during times of peak power demand.
New ultracapacitor material could be fabricated directly on chips and solar cells.
A device for power tools may also help regenerative braking.
Digital quantum batteries could exceed lithium-ion performance by orders of magnitude.
DOE funds the development of low-cost sodium-ion batteries.
Nanowire anodes could let lithium-ion batteries run twice as long.
A government-funded start-up claims it can make ionic liquid energy storage feasible.