High Performance Hybrid Aqueous Li/NiCl2 Rechargeable Batteries with Water‐Stable High Lithium‐Ion Conductivity Solid Electrolyte

Abstract

AbstractThe feasibility of a novel high specific energy and power density rechargeable aqueous lithium battery with a lithium anode, an aqueous NiCl2 catholyte, and a water‐stable high lithium‐ion conducting solid electrolyte separator was investigated. Water‐stable Li1.6Al0.4Ge0.2Ti1.4(PO4)3‐10 wt % TiO2‐3 wt % LiCl ⋅ H2O‐expoxy resin (LAGTP‐T), which has a high lithium‐ion conductivity of 10−3 S cm−1 at 25 °C and an excellent bending strength of 150 N mm−2, was used as the separator between the lithium anode and the aqueous NiCl2 catholyte in the rechargeable aqueous Li/NiCl2 battery. The battery was successfully operated at 5 mA cm−2 and room temperature. The estimated specific energy density of the battery based on the cell components of a 200 μm thick LAGTP‐T, a lithium anode, current collectors, and an interlayer electrolyte is higher than that of the conventional lithium‐ion battery with a carbon anode and a LiCoO2 cathode at a high specific capacity of more than 15 mAh cm−2, and that at 50 mAh cm−2 is two times higher than that of the lithium‐ion battery.