Stack Pressure Dependence of Li Stripping/Plating Performance in All-Solid-State Li Metal Cells Containing Sulfide Glass Electrolytes

Sulfide-based all-solid-state Li/S batteries have attractedconsiderableattention as next-generation batteries with high energy density.However, their practical applications are limited by short-circuitingdue to Li dendrite growth. One of the possible reasons for this phenomenonis the contact failure caused by void formation at the Li/solid electrolyteinterface during Li stripping. Herein, we studied the operating conditions,such as stack pressure, operating temperature, and electrode composition,that could potentially suppress the formation of voids. Furthermore,we investigated the effects of these operating conditions on the Listripping/plating performance of all-solid-state Li symmetric cellscontaining glass sulfide electrolytes with a reduction tolerance.As a result, symmetric cells with Li-Mg alloy electrodes insteadof Li metal electrodes exhibited high cycling stability at currentdensities above 2.0 mA cm(-2), a temperature of 60 & DEG;C, and stack pressures of 3-10 MPa. In addition, an all-solid-stateLi/S cell with a Li-Mg alloy negative electrode operated stablyfor 50 cycles at a current density of 2.0 mA cm(-2), stack pressure of 5 MPa, and temperature of 60 & DEG;C, while itsmeasured capacity was close to a theoretical value. The obtained resultsprovide guidelines for the construction of all-solid-state Li/S batteriesthat can reversibly operate at high current densities.

Automated summary

The operating conditions of sulfide-based all-solid-state Li/S batteries were studied to suppress the formation of voids. It was found that using Li-Mg alloy electrodes can improve the cycling stability of the batteries and allow them to operate at high current densities.