Air Stabilization of Li7P3S11 Solid-State Electrolytes through Laser-Based Processing

Abstract

All-solid-state batteries (ASSBs) that employ solid-state electrolytes (SSEs) have the potential to replace more conventional batteries that employ liquid electrolytes due to their inherent safety, compatibility with lithium metal and reputable ionic conductivity. Li7P3S11 is a promising SSE with reported ionic conductivities in the order of 10 mS/cm. However, its susceptibility to degradation through oxidation and hydrolysis limits its commercial viability. In this work, we demonstrate a laser-based processing method for SSEs to improve humidity stability. It was determined that laser power and scanning speed greatly affect surface morphology, as well as the resulting chemical composition of Li7P3S11 samples. Electrochemical impedance spectroscopy revealed that laser treatment can produce SSEs with higher ionic conductivities than pristine counterparts after air exposure. Further examination of chemical composition revealed an optimal laser processing condition that reduces the rate of P2S74− degradation. This work demonstrates the ability of laser-based processing to be used to improve the stability of SSEs.

Feature-rich electronic properties of three-dimensional ternary compound: Li7P3S11

“…To validate the theoretical predictions, experimental techniques can be employed. X-ray diffraction (XRD) (Tufail et al ., 2023), transmission electron microscopy (TEM) (Chircov et al ., 2021; Song et al ., 2020) and scanning electron microscopy (SEM) (Wang et al ., 2018; Zheng et al ., 2020; Eatmon et al ., 2023) are suitable for determining the optimal geometry, while optical absorption spectra can shed light on the occupied electronic states and band gap. SEM can provide high-resolution images of the material’s surface, revealing details about its morphology, topography and surface features (Tufail et al ., 2021).…”