Impact of diverse material precursors on microstructure and ionic conductivity Li_0.33La_0.56TiO₃ solid-state electrolyte properties

The development of rechargeable lithium-ion batteries (LIBs) with solid-state electrolyte (SSE) is gaining attention in recent years. Among various SSE materials, lithium lanthanum titanate (LLTO) has emerged as a promising candidate due to its high ionic conductivity and excellent chemical stability. This study aims to synthesis and investigate the potential of Indonesian locally source lanthanum oxide compared to commercial lanthanum oxide for use as an SSE material. LLTO powders were synthesized via the solid-state reaction method. The local LLTO pellet achieved an impressive relative density of 99 %, slightly higher than the commercial LLTO at 97 %. This high relative density enhances ionic conductivity. The local LLTO sample achieved the highest ionic conductivity of 2.68×10⁻⁵ S/cm at 100°C and 1.15×10⁻⁵ S/cm at room temperature, nearly double that of commercial LLTO measuring approximately 8.40×10⁻⁶ S/cm at 100°C and around 4.57×10⁻⁶ S/cm at room temperature. The research findings indicate that lanthanum oxalate sourced from waste generated during monazite sand mining operations in the Bangka Belitung region of Indonesia, exhibits potential as a material for lithium-ion-conducting electrolytes in all-solid-state batteries.