Abstract
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 (RbAg
4
I
5
) 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 RbAg
4
I
5
electrolyte was developed. A four-electrode method was used to evaluate the ionic conductivity of RbAg
4
I
5
electrolyte. The values of the ionic conductivity of RbAg
4
I
5
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, RbAg
4
I
5
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.
Figure 1