The lithium-ion battery is good for moving cars short distances, but aviation requires longer-lasting power. Maybe we need to try other elements.
ago, while driving on a stretch of interstate between Pittsburgh and San Francisco, Venkat Viswanathan began to feel a little existential. His trip was going smoothly—almost too smoothly, he thought. He would hum along for a few hundred miles at a time, stopping briefly for meals or to take in the early summer scenery. It was the classic Great American road trip. And it was hardly remarkable at all that he was doing it in an electric car.
Or by rethinking some battery fundamentals. Last week, along with other battery and aviation experts, Viswanathanwhat he considers a “wake-up call” to the industry to invest in basic science beyond moving around lithium ions. In particular, the authors advocate for new cathodes involving more exotic materials, some of which produce what are known as conversion reactions, which move more electrons and can potentially pack more energy.
For planes, the same principle of space- and weight-saving applies to staying aloft over long distances. But a battery that has only a single life won’t work for a plane that needs to recharge with every leg. In the lab, researchers have had some success in reversing those conversion reactions, but only to face other problems. One of the contenders that’s furthest along is the lithium-sulfur battery—a highly desirable chemistry because of how cheap and plentiful sulfur is.
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