Startup debuts the potassium-ion battery

US startup Group1 has introduced the world’s first commercial potassium-ion batteries. Manufactured in the widely used cylindrical 18650 form factor operating at 3.7 volt, they are a direct stand-in for lithium-ion batteries, particularly for lithium iron phosphate (LFP) technology. Like LFP, Group1’s batteries achieve a gravimetric energy density of 160-180 Wh/kg, but with the added benefit of a superior life time, the startup claims.

Although demand for lithium has dramatically decreased recently, there are long-term worries about meeting demand. By contrast, the reserves of potassium are practically inexhaustible and the metal is distributed evenly across the earth’s surface. The same is true for sodium, but potassium is better compatible with standard graphite anodes and makes for higher energy densities.

Potassium’s showstopper so far has been the cathode. Group1 has developed cathode material based on the Prussian White pigment, called Kristonite. “This innovation represents years of dedicated research and product development. By distributing samples to our partners among Tier 1 OEMs and cell manufacturers, we are paving the way for widespread adoption of this transformative technology,” said Alexander Girau, CEO of Group1.