Exergy’s batteries employ simple scalable production processes to offer batteries against low costs. Each Exergy battery is build of multiple cells. Every cell consists of a cathode compartment (positive pole) and an anode compartment (negative pole). When the cell is charging, ions flow from the anode to the cathode (storing energy). While if the cell discharges the ions flow from the cathode to the anode (and electrons release the stored energy).
Both poles within the cell are separated by a ceramic membrane that eliminates the chance for dendrite formation, which is for example an important cause for cell failures of Li-ion batteries (used in many mobile devices). Another important characteristic is that the catholyte used in Exergy cells is non-flammable and intrinsically safe.
The batteries are made from abundant raw materials that can be sourced virtually anywhere. The two charts to the right give an idea of the abundance and world-wide production of certain key raw materials needed for Exergy batteries (Iron, Sodium, Aluminium) and from competitors such as Li-ion or Vanadium batteries (Vanadium, Nickel, Cobalt, Lithium).
As can be seen, battery technologies such as Li-ion or Vanadium are strikingly dependent on scare materials.
Source and more details: https://en.wikipedia.org/wiki/Abundance_of_elements_in_Earth’s_crust