Co-Sinterable Lithium Garnet-Type Oxide Electrolyte with Cathode for All-Solid-State Lithium Ion Battery
We investigated the development of a novel garnet-type oxide electrolyte, which is co-sinterable with a LiCoO2 cathode, based on the strategy to enhance interdiffusion between LLZO grains and grain boundaries by an appropriate selection of dopants in LLZO and additives. The sintering temperature of LLZO drastically decreased to 790 oC with maintaining high lithium ion conductivity but without the reaction with a metal oxide cathode (LiCoO2).
In addition, an all-solid-state lithium ion battery was successfully prepared by co-sintering of the stacked cathode/electrolyte layer, and confirmed to function well as a secondary battery. These results opened the potential for fabrication of all-solid-state lithium ion batteries using oxide electrolytes by a simple and well-established co-sintering process.