Pascalammetry with operando microbattery probes: Sensing high stress in solid-state batteries.
- Author(s): Larson, Jonathan M
- Gillette, Eleanor
- Burson, Kristen
- Wang, Yilin
- Lee, Sang Bok
- Reutt-Robey, Janice E
- et al.
Published Web Locationhttps://doi.org/10.1126/sciadv.aas8927
Energy storage science calls for techniques to elucidate ion transport over a range of conditions and scales. We introduce a new technique, pascalammetry, in which stress is applied to a solid-state electrochemical device and induced faradaic current transients are measured and analyzed. Stress-step pascalammetry measurements are performed on operando microbattery probes (Li2O/Li/W) and Si cathodes, revealing stress-assisted Li+ diffusion. We show how non-Cottrellian lithium diffusional kinetics indicates stress, a prelude to battery degradation. An analytical solution to a diffusion/activation equation describes this stress signature, with spatiotemporal characteristics distinct from Cottrell's classic solution for unstressed systems. These findings create an unprecedented opportunity for quantitative detection of stress in solid-state batteries through the current signature. Generally, pascalammetry offers a powerful new approach to study stress-related phenomena in any solid-state electrochemical system.