A US research team has developed all-solid-state sodium batteries that retain performance down to subzero temperatures. The systems utilize a special chloride-based solid-electrolyte-coated cathode.

From ESS News

As lithium-ion batteries continue to improve in terms of both performance and cost, it is becoming increasingly difficult for alternative technologies to challenge the incumbent. However, interest in solid-state batteries, which promise better energy density and safety, has significantly increased in recent times.

Similar to lithium-ion batteries, solid-state batteries store energy and release it to power devices. But instead of the liquid or polymer gel electrolytes used in lithium-ion cells, solid-state batteries rely on a solid electrolyte.

Building on this principle, researchers at the University of Chicago have developed a new sodium-based solid electrolyte that can reportedly maintain performance even at subzero temperatures.

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