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Lithium-ion batteries with nanotube electrodes could go longer between charges.
An alternative to batteries gets an advance from tiny, crumpled sheets of graphene, whose electrodes can store more charge because they have larger surface areas.
DOE funds the development of low-cost sodium-ion batteries.
A 19th-century idea might lead to cleaner cars, larger-scale renewable energy.
Portable electronics could run 40 percent longer using a new type of anode.
New solid-state power-management devices will charge cars fast and make the power grid more flexible and efficient.
Magnetic-field energy storage could have unique advantages, but scaling up will be a challenge.
Nanowire anodes could let lithium-ion batteries run twice as long.