they too easily slip through the membrane, reducing the battery’s lifetime and performance.
Rather than change the membrane,
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, a group led by chemist Joaquín Rodríguez-L&oacuteez of the University of Illinois at Urbana-Champaign devised ways to bulk up the battery’s active materials by changing their size or configuration. The scientists linked tens to millions of active molecules together to create large,
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, ringed structures,
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, long strings of molecules hooked onto a polymer backbone,
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, or suspensions of polymers containing up to a billion molecules,
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, they reported in the Journal of the American Chemical Society in 2014.
With the oversized molecules,
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, even “simple,
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, inexpensive porous membranes are effective at preventing crossover,” Crabtree says. A prototype flow battery that provides low-cost power and lasts 20 to 30 years is expected to be completed in the coming year.
Getting air

Battery: Lithium-air


How it works: Oxygen molecules from the air react with lithium ions in the anode to release energy. Recharging forces out the oxygen atoms,
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, and the lithium is ready to start again



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