Subzero temperatures were no match for the experimental battery.
Few recent inventions have proven their worth more than the humble lithium-ion battery. It’s been only 30 years since they first left the lab, but they’re what power smartphones in the world’s palms and put electric cars on the road. They’ll only become more important as critical components of renewable energy grids.more than thirtyfold, even as they’ve grown ever more powerful. But they aren’t perfect. For one, they struggle in the deep cold.
For most of the world, subzero temperatures aren’t a problem. But if you live in, say, the American Midwest, your electric car might have less range in January than you might like. And if you’ve ever been caught outside in the frozen winter, you might have noticed that your phone’s battery tends to drain more quickly.
That is, it works until the battery cools to beneath minus 4°F. In the past several years, scientists have found that much of the issue has to do with the movement of the ions themselves, which struggle to properly exit the electrolyte and land on the negative plate. Scientists have tried to alleviate that problem by making hardier electrolytes that hold up in the cold better.
When they tested their battery, they found that it worked at temperatures as frigid as minus 31°F. Even after over 200 cycles of discharging, charging, and recharging, this battery kept up its performance.
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