Colloidal processing of Li2S-P2S5 films fabricated via electrophoretic deposition methods and their characterization as a solid electrolyte for all solid state lithium ion batteries

Abstract

Li2SP2S5 (LPS) film was prepared using colloidal process by employing electrophoretic deposition (EPD) technique followed by warm pressing for advanced processing of all-solid-state lithium ion battery. LPS precursor film with positive surface charge was obtained from its suspension that was synthesized by liquid-phase shaking method. The homogeneous film with thickness of 10100 μm was controllably prepared. Resulted LPS film exhibited high conductivity (1.98 × 10-4Scm-1) at ambient temperature and significantly low activation energy (16.6 kJ mol-1) compared with conventional LPS materials. Thus, good solidsolid interfacial contact can be obtained in the sulfide-based ionic conductor by employing EPD process followed by warm pressing.