Fraunhofer Institute for Ceramic Technology and Science ( IKTS ) has developed a low - cost , ceramic high - temperature battery for stationary storage . Image: The 5 ##V Cerenergy battery relies on a combination of sodium and potassium , eliminating the need for costly rare earth minerals , and has a cellular cost of € 100 / kWh – half that of lithium - ion batteries . IKTS said the module achieved a 90 % efficiency with an energy density of 130 W / kg , and will be ready for production in the coming months .
Fraunhofer Institute for Ceramic Technology and Science ( IKTS ) has developed a low - cost , ceramic high - temperature battery for stationary storage . The 5 ##V Cerenergy battery relies on a combination of sodium and potassium , eliminating the need for costly rare earth minerals , and has a cellular cost of € 100 / kWh – half that of lithium - ion batteries . IKTS said the module achieved a 90 % efficiency with an energy density of 130 W / kg , and will be ready for production in the coming months .