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

Abstract

Li-stuffed garnet-type Li 7La 2.75Ca 0.25Zr 1.75Nb 0.25O 12 (LLCZNO) and Li 7+yLa 2.75Ca 0.25Zr 1.75-yNb 0.25MyO 12 (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% H 2/N 2. 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.

Authors:
 [1];  [1];  [2]; ORCiD logo [1]
  1. Univ. of Calgary, Calgary, AB (Canada). Dept. of Chemistry
  2. Univ. of Maryland, College Park, MD (United States). Dept. of Materials and Engineering
Publication Date:
Research Org.:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
OSTI Identifier:
1510050
Grant/Contract Number:  
AR0000787
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of the Electrochemical Society
Additional Journal Information:
Journal Volume: 165; Journal Issue: 10; Journal ID: ISSN 0013-4651
Publisher:
The Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE

Citation Formats

Samson, Alfred Junio, Hofstetter, Kyle, Wachsman, Eric, and Thangadurai, Venkataraman. Towards Mixed Ionic and Electronic Conducting Li-Stuffed Garnets. United States: N. p., 2018. Web. doi:10.1149/2.1001810jes.
Samson, Alfred Junio, Hofstetter, Kyle, Wachsman, Eric, & Thangadurai, Venkataraman. Towards Mixed Ionic and Electronic Conducting Li-Stuffed Garnets. United States. doi:10.1149/2.1001810jes.
Samson, Alfred Junio, Hofstetter, Kyle, Wachsman, Eric, and Thangadurai, Venkataraman. Wed . "Towards Mixed Ionic and Electronic Conducting Li-Stuffed Garnets". United States. doi:10.1149/2.1001810jes. https://www.osti.gov/servlets/purl/1510050.
@article{osti_1510050,
title = {Towards Mixed Ionic and Electronic Conducting Li-Stuffed Garnets},
author = {Samson, Alfred Junio and Hofstetter, Kyle and Wachsman, Eric and Thangadurai, Venkataraman},
abstractNote = {Li-stuffed garnet-type Li7La2.75Ca0.25Zr1.75Nb0.25O12 (LLCZNO) and Li7+yLa2.75Ca0.25Zr1.75-yNb0.25MyO12 (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.},
doi = {10.1149/2.1001810jes},
journal = {Journal of the Electrochemical Society},
issn = {0013-4651},
number = 10,
volume = 165,
place = {United States},
year = {2018},
month = {7}
}

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Works referenced in this record:

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