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German sulfur battery startup Theion raises 16.4 mln dollars to scale-up

Theion, a German sulfur battery startup, announced on Thursday that it had raised $16.4 million from investors for the purpose of scaling up its battery cells. It claims these battery cells store more energy and are cheaper than lithium-ion battery packs used in electric vehicles. The Series A financing round was led jointly by the Geschwister Oetker Beteiligungen Group, Team Global and German renewables company Enpal.

Theion claims its batteries are three times more energy dense than conventional lithium-ion battery, but only cost a third and emit a fraction of carbon dioxide.

CEO Ulrich Ehmes said that theion’s batteries could be used in electric vehicles, flying cabs or energy storage. In theory, these cells could appear in electric cars on the road by the end of this decade.

Ehmes stated that theion had successfully developed small coin-cell batteries, and the funding would be used to develop larger pouch cells required to power EVs or planes.

He said that "car companies, stationary storage firms, and companies in the electric aeronautics sector" were all watching us. "Everyone now waits for our pouch cells, because the coin cell is not able to fly an airplane."

The company is one of many startups in Europe and the United States that are trying to break through with sulfur.

The biggest challenges for sulfur batteries are that they tend to corrode and "breathe", where they expand, and destroy battery packs.

Ehmes stated that theion has overcome this challenge by using crystalline sulfate to prevent corrosion and pre-expanding its battery's cathode.

(source: Reuters)