Joule
Jun 17, 2022
Soft breakdown hidden in ASSLBs has been overlooked in most previous research. Here we propose a simple but effective strategy—cyclic voltammetry— to diagnose soft breakdown in all-solid-state batteries. Moreover, low-frequency electrochemical impedance spectroscopy is employed to quantify the soft breakdown. With this understanding, we establish a standard testing protocol, which could be used to unify future research endeavors if adopted. This work provides new insights into ASSLBs and establishes assessment metrics for this community.
To develop next-generation energy storage systems with high energy density and unprecedented safety, all-solid-state lithium batteries (ASSLBs) that replace conventional flammable organic liquid electrolytes with solid-state electrolytes (SSEs) have been revived in academia and industry. However, soft breakdown hidden in ASSLBs has not been well-realized, which generally leads to unreliable conclusions and significantly retards ASSLB development. To exclude this phenomenon, we propose a simple but effective method—cyclic voltammetry—to diagnose the soft breakdown in ASSLBs. Moreover, a low-frequency electrochemical impedance analysis is employed to quantify the soft breakdown phenomenon. Finally, a standard testing protocol is suggested, which could help this community obtain reliable and comparable results in the future. This work's fundamental understanding and established assessment metrics are also applicable to other metal-based all-solid-state batteries.