An Aqueous Lithium-Iodine Battery with Solid Polymer Electrolyte-Coated Metallic Lithium Anode

An aqueous lithium-iodine (Li-I-2) cell with solid polymer electrolyte (SPE)-passivated metallic Li is demonstrated. The metallic Li anode is isolated from the aqueous I-3(-)/I- cathode by the SPE and a Li-ion-conductive solid electrolyte layer. The proposed aqueous Li-I-2 cells exhibit a discharge potential of approximately 3.4 V versus Li+/Li, stable capacity retention for 50 cycles, and adequate rate capability.