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; Adapted by E. Otwell" />

What it’s used for: Cars,
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, cell phones, laptops

Advantages: Magnesium, more plentiful than lithium,
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, provides two electrons (vs. lithium’s one) so it could provide twice as much juice

Obstacles: Chemistry not well understood yet,
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; batteries have short lives

Source: Argonne National Lab


Scientists at Argonne are constructing another battery type: one that replaces lithium ions at the anode with magnesium. This switch could instantly boost the electrical energy released for the same volume,
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, says Argonne materials engineer Brian Ingram,
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, noting that a magnesium ion has a charge of +2,
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, double that of lithium’s +1. Magnesium’s ability to produce twice the electrical current of lithium ions could allow for smaller, more energy-dense batteries, Ingram says.
Magnesium comes with its own challenge, however. Whereas lithium ions zip through a battery’s electrolyte, magnesium ions slowly trudge. A team of researchers at Argonne,
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, Northwestern University and Oak Ridge National Laboratory shot high-energy X-rays at magnesium in various batteries and learned that the drag is due to interactions with molecules that the magnesium attracts within the electrolyte. Ingram and his group are experimenting with new materials to find a molecular recipe that reduces such drag.
Ingram’s

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