Researchers turned the thin plastic separator sheets inside dead lithium batteries into seawater filters. Recyclers normally throw those sheets away while chasing the metals, but reworked into membranes they stripped 99.6 percent of the salt out of seawater in two stages.
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Inside a conventional lithium-ion battery is a thin plastic sheet called a separator. It sits between the two electrodes and keeps them from touching while allowing lithium ions to move through. It does its job silently for years, and when the battery dies, it often gets discarded.
A team at Yonsei University in Seoul decided to do something else with it. Instead of tossing the separator, they reworked it into a filter that pulls salt out of seawater. In a paper published in Materials Horizons,
A team at Yonsei University in Seoul decided to do something else with it. Instead of tossing the separator, they reworked it into a filter that pulls salt out of seawater. In a paper published in Materials Horizons,
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