All Solid-state Batteries with Quasi-zero Stack Pressure

Mechanical failures remain the prime obstacle for the industrialization of all solid-state batteries (ASSBs), which originate from the inherent high rigidity of the solid-state electrolytes (SSEs). Herein, we propose a facile strategy to realize a polymer-like ductility for conventional inorganic SSEs through the quench induced amorphization, thereby promoting the mechanical stabilities and curtailing the stack pressure of ASSBs to quasi-zero level. Li3YCl6 solid electrolyte is transformed from crystalline to amorphous by ‘freezing’ its high temperature disorder state, thus cutting down the Young’s modulus from 27.8 GPa to 2.3 GPa as the reduced bond strength. Extra surprise is also witnessed as the promoted ionic conductivity from 0.69 to 3.18 mS/cm, which is attributed to the eliminated grain boundary resistance, and the increased bulk ionic transport dimensionality. We also demonstrate that, the universality effectiveness of quench induced amorphization is corelate with the symmetry of the pristine SSEs lattice, and can be extended to other halides SSEs family.