it’s used for: Cars

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,
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, materials. The lithium-air battery, still in early development, uses oxygen sucked in from the atmosphere to drive the chemical reaction that produces electricity. In the process,
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, oxygen combines with lithium ions to form a solid compound (lithium peroxide). During charging, 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,
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, 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,
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, cutting the battery’s energy-storage capacity and life span.
Using electron microscopy to study the reaction products of a lithium-air prototype, 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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