All-Solid-State Rechargeable Battery with Rubidium Silver Iodide Electrolyte

Wednesday, 31 May 2017: 10:40
Grand Salon C - Section 15 (Hilton New Orleans Riverside)
Y. Wang, C. Zhang, X. Qiao, and X. Zhou (University of Miami)
All-solid-state electrochemical devices have drawn tremendous attention in recent years. Solid electrolytes are advantageous over liquid electrolytes because solid electrolytes have wider operation temperature range and are leakage free, non-flammable, thermally stable, and easy for fabrication. However, one of the major issues of all-solid-state electrochemical devices is the low ionic conductivity of the solid electrolyte. Rubidium silver iodide (RbAg4I5) has very high ionic conductivity because the iodide tetrahedral arrangement provides diffusion paths for the silver ions. In this work, a novel all-solid-state structural rechargeable battery with RbAg4I5 electrolyte was developed. A four-electrode method was used to evaluate the ionic conductivity of RbAg4I5 electrolyte. The values of the ionic conductivity of RbAg4I5 are in the range of 0.15-0.24 S cm-1. The electrodes of all-solid-state rechargeable batteries were prepared with high surface activated carbon, conductive carbon, RbAg4I5 and AgI. The independently made components were pressed together using a clipper. The cyclic voltammetry (CV) curves and galvanostatic charge/discharge (GCD) curves are shown as Figure 1 and Figure 2, respectively. The charge and discharge efficiency is 95%. The power density can reach 0.2 kW/kg and the energy density can reach 10 Wh/kg. Also, the operational temperature range of this all solid rechargeable battery is -40-100°C. The electrochemical processes during the charge/discharge processes are discussed.