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Advantages: Could make a very light battery

Obstacles: Finding electrolytes that don’t react with other components is a challenge,
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; batteries have very short life span and may need extra safety engineering

Source: Argonne National Lab


Looking beyond 2017, scientists envision a new generation of batteries made of low-cost,
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, or even no-cost, materials. The lithium-air battery, still in early development,
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, uses oxygen sucked in from the atmosphere to drive the chemical reaction that produces electricity. In the process, oxygen combines with lithium ions to form a solid compound (lithium peroxide). During charging,
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, solid oxygen reverts back to its gaseous form.
“Lithium-air potentially offers the highest energy density possible,
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,” says MIT materials engineer Ju Li. “You basically react lithium metal with oxygen in air, and in principle you get as much useful energy as gasoline.”
Lithium-air has problems, though. The batteries are hard to recharge, losing much of their power during the process. And the chemical reaction that powers the battery generates heat, cutting the battery’s energy-storage capacity and life span.
Using electron microscopy to study the reaction products of a lithium-air prototype,
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, Li and his group came up with a possible solution: Keep oxygen in a solid form sealed within the battery to prevent the oxygen from forming a gas. By encasing oxygen and lithium in tiny glasslike particles,
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, the scientists created

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