German battery materials developer Altech Advanced Materials AG (<a href="https://www.boerse-frankfurt.de/aktie/altech-adv-mat-na-o-n-1" target="_blank">ETR:AMA</a>) said on Monday that its subsidiary Altech Batteries GmbH (ABG) has received a permit to build a plant with a capacity to produce 120 MWh of sodium chloride solid-state batteries per year.