Effect of reaction temperature and impact force on formation and particle shape of β-Li3PS4 in liquid phase synthesis

Abstract

All-solid-state lithium-ion batteries are promising next-generation secondary batteries, primarily due to their superior safety. In their production process, it is necessary to achieve large contact interfaces between the particles and improve particle fluidity. The particle shape of the solid electrolyte plays a key role in addressing these requirements. Li3PS4 (LPS) is synthesized in the liquid phase and offers the advantages of cost-effectiveness and production-scalability. However, the mechanisms controlling the particle size and shape have not yet been revealed. In this study, we synthesized LPS particles in the liquid phase using a hot stirrer and an ultrasonic homogenizer to investigate the effects of reaction temperature and impact force on the reaction rate and particle shape. We successfully synthesized shape-controlled particles with high ionic conductivity by combining different synthesis methods. This study provides valuable data for optimizing the synthesis conditions to attain specific particle shapes and sizes.