Processing and characterization of an Li7La3Zr0.5Nb0.5Ta0.5Hf0.5O12 high-entropy Li–garnet electrolyte

Zhezhen Fu, Jacob Ferguson

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

In this paper, we demonstrated the processing of Li7La3Zr0.5Nb0.5Ta0.5Hf0.5O12 (LLZNTH) high-entropy Li–garnet with promising properties for lithium batteries. We first synthesized the LLZNTH Li–garnet powders which have a single cubic garnet phase (space group: (Formula presented.); No. 230) without any secondary phases as well as uniform elements distributions. The prepared powders were further densified to a relative density of ∼94% with well-crystallized grains and good contact with the neighboring grains. Minimal grain growth can be observed in the sintering time range from 8 to 20 h, which is likely due to the sluggish effects of high-entropy compounds. The sample also maintains the cubic garnet phase along with uniform elements distribution after sintering. Electrochemical characterizations indicate that the densified sample has an adequate ionic conductivity of 4.67 × 10−4 S cm−1 at room temperature, a low activation energy of 0.25 eV, and a low electronic conductivity in the order of 10−8 S cm−1. The significance of designing high-entropy electrolyte is further discussed.

Original languageEnglish (US)
Pages (from-to)6175-6183
Number of pages9
JournalJournal of the American Ceramic Society
Volume105
Issue number10
DOIs
StatePublished - Oct 2022

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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