Freeze casting is used for the first time to prepare solid electrolyte scaffolds with oriented porosity and dense ceramic walls made of Li_7La_3Zr_2O_(12) (LLZO), one of the most promising candidates for solid state battery electrolytes. Processing parameters ‐ such as solvent solidification rate, solvent type, and ceramic particle size ‐ are investigated, focusing on their influence on porosity and ceramic wall density. Dendrite‐like porosity is obtained when using cyclohexane and dioxane as solvents. Lamellar porosity is observed in aqueous slurries resulting in a structure with the highest apparent porosity and densest ceramic scaffold but weakest mechanical properties due to the lack of interlamellar support. The use of smaller LLZO particle size in the slurries resulted in lower porosity and denser ceramic walls. The intrinsic ionic conductivity of the oriented LLZ ceramic scaffold is unaffected by the freeze casting technique, providing a promising ceramic scaffold for polymer infill in view of designing new types of ceramic‐polymer composites.

中文翻译：

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具有定向开孔和连续陶瓷支架的致密冷冻铸造 Li7 La3 Zr2 O12 固体电解质

冷冻铸造首次用于制备由 Li_7La_3Zr_2O_(12) (LLZO) 制成的具有定向孔隙和致密陶瓷壁的固体电解质支架，这是固态电池电解质最有希望的候选者之一。研究了加工参数——例如溶剂固化速率、溶剂类型和陶瓷粒度——重点研究它们对孔隙率和陶瓷壁密度的影响。当使用环己烷和二恶烷作为溶剂时，会获得枝晶状孔隙。在水性浆液中观察到层状孔隙率，导致结构具有最高的表观孔隙率和最致密的陶瓷支架，但由于缺乏层间支撑，机械性能最弱。在浆料中使用较小的 LLZO 粒径导致孔隙率较低和陶瓷壁更致密。