Probing the Mechanical Properties of a Doped Li 7 La 3 Zr 2 O 12 Garnet Thin Electrolyte for Solid-State Batteries

作者：Zhezhen Fu, Lei Zhang, Jack E. Gritton, Griffin L. Godbey, Tanner Hamann, Yunhui Gong, Dennis W. McOwen, Eric D. Wachsman · 发表于：ACS Applied Materials & Interfaces · 年份：2020 · DOI：10.1021/acsami.0c01681 · 被引用次数：42 · 研究领域：Advanced Battery Materials and Technologies、Advancements in Battery Materials、Flame retardant materials and properties

Using the nanoindentation technique, we probed the mechanical properties of tape cast and sintered thin doped Li 7 La 3 Zr 2 O 12 garnet electrolytes. For comparison, a bulk garnet sample fabricated by die pressing and sintering was also studied. The results indicate that the thin sample has a significantly higher elastic modulus (∼155 GPa), hardness (∼11 GPa), and indentation fracture toughness (∼1.12 ± 0.12 MPa·m 1/2 ) than the bulk sample (∼142 GPa, ∼10 GPa, and ∼0.97 ± 0.10 MPa·m 1/2, respectively). The above results demonstrate that the thin sample can more effectively prevent lithium dendrite penetration due to its better mechanical properties. Deformation and creep behavior analysis further indicates that the thin sample (1) has a higher resistance to withhold the charge/discharge stress and consequently deformation and (2) a lower creep exponent and likely high resistance to brittle failure.