Figure 4. Prototype of a high energy-density rechargeable Mg battery.
(a) Schematic illustration of the proposed Mg battery system. MgFeSiO4 and Mg metal are used as the cathode and the anode, respectively. Mg(TFSI)2–triglyme is used as the electrolyte. (b) Charge–discharge voltage profiles of proposed Mg rechargeable battery. Two-electrode cells with ion-exchanged MgFeSiO4 (cathode) and Mg (anode) were used. Measurements were performed at 100°C at a current density of 6.62 mA·g−1. Capacity range was limited to 0.5 Mg2+ per Fe.