Mechanically Robust Ultrathin Solid Electrolyte Membranes Using a Porous Net Template for All-Solid-State Batteries

All-solid-state batteries (ASBs) have been identifiedas a potentialnext-generation technology for safe energy storage. However, the currentpellet form of solid electrolytes (SEs) exhibits low cell-level energydensities and mechanical brittleness, and this has hampered the commercializationof ASBs. In this work, we report on the development of an ultrathinSE membrane that can be reduced to a thickness of 31 mu m withminimal thermal shrinkage at 140 degrees C, while exhibiting robustmechanical properties (tensile strength of 19.6 MPa). Due to its exceptionalionic conductivity of 0.55 mS/cm and the corresponding areal conductanceof 84 mS/cm(2), the SE membrane-incorporated ASB displayscell-level gravimetric and volumetric energy densities of 127.9 Wh/kg(cell) and 140.7 Wh/L-cell, respectively. These valuesrepresent a 7.6- and 5.7-fold increase over those achieved with conventionalSE pellet cells. Our results demonstrate the potential of the developedSE membrane to overcome the critical challenges in the commercializationof ASBs.

Automated summary

In this study, an ultrathin solid electrolyte membrane with excellent mechanical properties and exceptional ionic conductivity was developed for all-solid-state batteries. The incorporation of this membrane significantly increased the cell-level energy density and power density of the battery. These results demonstrate the potential of the developed solid electrolyte membrane in the commercialization of all-solid-state batteries.