Towards Mixed Ionic and Electronic Conducting Li-Stuffed Garnets

Samson, Alfred Junio; Hofstetter, Kyle; Wachsman, Eric; Thangadurai, Venkataraman

doi:10.1149/2.1001810jes

Title: Towards Mixed Ionic and Electronic Conducting Li-Stuffed Garnets

Journal Article · 25 July 2018 · Journal of the Electrochemical Society

DOI: https://doi.org/10.1149/2.1001810jes · OSTI ID:1510050

Samson, Alfred Junio ^[1]; Hofstetter, Kyle ^[2]; Wachsman, Eric ^[3];

^[2]

Univ. of Calgary, Calgary, AB (Canada). Dept. of Chemistry; Univ. of Calgary (Canada)
Univ. of Calgary, Calgary, AB (Canada). Dept. of Chemistry
Univ. of Maryland, College Park, MD (United States). Dept. of Materials and Engineering

Li-stuffed garnet-type Li₇La_2.75Ca_0.25Zr_1.75Nb_0.25O₁₂ (LLCZNO) and Li_7+yLa_2.75Ca_0.25Zr_1.75-yNb_0.25MyO₁₂ (M = Mn, Fe, Co, Ni; y = 0.1, 0.2, referred to as yM-LLCZNO) were synthesized in air by ceramic synthesis at different sintering temperatures. The resulting compositions were characterized for their phase formation and microstructure, and their ionic and electronic conductivities in air and 7% H₂/N₂. Powder X-ray diffraction showed that transition metal-doped LLCZNO garnets contain several impurity phases. The transition metal-substituted samples have lower conductivities than that of the parent LLCZNO. The electronic conductivities of selected transition metal-doped LLCZNO samples were found to be about 4 to 5 orders of magnitude lower than their corresponding ionic conductivity, highlighting the challenge to design single-phase mixed electronic and ionic conducting Li-stuffed garnets in both oxidizing and reducing atmospheres. The research area of single-phase mixed conducting Li-garnet is relatively unexplored at the moment, and a theoretical study will help to elucidate the underlying challenge in doping transition metal in Li-based garnets structure and its effect on transport properties.

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Research Organization:: Univ. of Maryland, College Park, MD (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AR0000787

OSTI ID:: 1510050

Journal Information:: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 10 Vol. 165; ISSN 0013-4651

Publisher:: The Electrochemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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