Fabrication of Three-Dimensional Battery Using Ceramic Electrolyte with Honeycomb Structure by Sol-Gel Process

Li0.35La0.55TiO3 (LLT) with a honeycomb structure, which has microsized holes on both sides of a membrane, was prepared as an electrolyte for three-dimensional all-solid-state rechargeable lithium-ion batteries. In this study, LiCoO2 and Li4Mn5O12 were used as cathode and anode materials, respectively, and their particles were fabricated by the sol-gel method, which provided not only small particles to inject into the microsized holes of the honeycomb electrolyte (0.6 and 0.3 mu m for LiCoO2 and Li4Mn5O12, respectively) but also particles with high discharge capacities (98.6 and 90.2% of their theoretical capacities for LiCoO2 and Li4Mn5O12, respectively). The impregnation of active material particles mixed with the precursor sol into the honeycomb holes provided a good contact between the LLT electrolyte and the active materials, which reduced the internal resistance of the cell and improved the discharge capacity. Accordingly, the LiCoO2/LLT/Li4Mn5O12 all-solid-state battery was successfully operated at 1.1 V with a discharge capacity of 7.3 mu Ah cm(-2).