Predicting the flexural strength of Li-ion-conducting garnet type oxide for solid-state-batteries

Zhezhen Fu, Dennis McOwen, Lei Zhang, Yunhui Gong, Yaoyu Ren, J. Evans Gritton, Griffin Godbey, Jiaqi Dai, Liangbing Hu, Eric Wachsman

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The mechanical strength of solid-state electrolytes is crucial for applications in solid-state batteries (eg block lithium dendrites and withhold the stress due to volume expansion of the electrode). We determined the flexural strength of doped Li7La3Zr2O12 (Li7La2.75Ca0.25Zr1.75Nb0.25O12, LLCZN) garnet type electrolyte as ~8.6 ± 1.5 MPa to ~51.5 ± 4.8 MPa as functions of porosity and grain size. Based on the experimental results, a series of theoretical models were established to obtain empirical equations to study the effects of porosity and grain size. Our further experiments demonstrate that the empirical equations can be used to predict the flexural strength of garnet type oxides based on its microstructure (porosity and grain size). Optimization of the grain size of fully dense garnet oxide can increase the strength up to ~106.0 ± 11.6 MPa (tape casting-sintering method with a grain size of ~2.8 µm).

Original languageEnglish (US)
Pages (from-to)5186-5195
Number of pages10
JournalJournal of the American Ceramic Society
Volume103
Issue number9
DOIs
StatePublished - Sep 1 2020

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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