Garnet structured Al-substituted Li₇La₃Zr₂O₁₂ (Al:LLZO) is a promising candidate as electrolyte in all-solid-state Li-ion batteries due to its chemical stability against Li-metal and high voltage cathode materials. In order to ensure long-term stable operation, electrolyte crack growth induced and/or the volume change of the active material on the cathode side needs to be avoided, requiring in particular knowledge of local and global mechanical properties of the electrolyte material. Micro-pillar splitting test was used for the first time on this material to determine the microscopic fracture toughness of single grains and compare it with conventional Vickers indentation fracture toughness (VIF), which represents macroscopic fracture toughness. Both methods yielded comparative results. In conclusion, the micro-pillar splitting test can be used as an advanced locally resolved characterization method that can open up new experimental directions for characterizing and understanding battery materials and enable a targeted approach for material improvements.

石榴石结构的Al取代的Li ₇ La ₃ Zr ₂ O ₁₂（Al：LLZO）因其对锂金属和高压阴极材料的化学稳定性而成为全固态锂离子电池电解质的有希望的候选者。为了确保长期稳定运行，需要避免引起的电解质裂纹增长和/或活性材料在阴极侧的体积变化，这特别需要了解电解质材料的局部和整体机械性能。首次对该材料进行微柱劈裂测试，以确定单晶粒的微观断裂韧度，并将其与代表宏观断裂韧度的常规维氏压痕断裂韧度（VIF）进行比较。两种方法均产生比较结果。综上所述，