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Roles of Alkaline Earth Ions in Garnet‐Type Superionic Conductors
Author(s) -
Song Shufeng,
Kotobuki Masashi,
Zheng Feng,
Xu Chaohe,
Wang Yu,
Li Wei Dong Z.,
Hu Ning,
Lu Li
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201600639
Subject(s) - alkaline earth metal , ionic radius , ion , lithium (medication) , doping , materials science , ionic conductivity , conductivity , octahedron , fast ion conductor , alkali metal , ionic bonding , electrochemistry , analytical chemistry (journal) , electrical resistivity and conductivity , inorganic chemistry , chemistry , metal , electrolyte , metallurgy , physics , electrode , medicine , optoelectronics , organic chemistry , chromatography , quantum mechanics , endocrinology
The roles of alkaline earth ions in garnet‐type superionic conductors Li 7.1 La 3 Zr 1.95 M 0.05 O 12 (M=Mg, Sr, Ba) are further investigated. In contrast to previous reports, the alkaline earth ions are specifically allocated to the octahedral sites (Zr 4+ sites) instead of dodecahedral sites (La 3+ sites) in the present work. The alkaline‐earth‐ion‐doped Li 7.1 La 3 Zr 1.95 M 0.05 O 12 garnets exhibit enhanced room‐temperature conductivities with the increasing ionic radii of alkaline‐earth ions. Ba‐doped Li 7.1 La 3 Zr 1.95 Ba 0.05 O 12 provides the highest conductivity of 1.13×10 −3 S cm −1 at room temperature, whereas Mg‐ and Sr‐doped garnets show conductivities of 4.32×10 −4 and 8.91×10 −4 S cm −1 at room temperature, respectively. The obtained ionic conductivities are comparable to other promising superionic conductors that are already known. Moreover, the alkaline‐earth‐ion‐doped garnets demonstrate a wide electrochemical stability window of 9 V vs. Li/Li + , and stability against metallic lithium by means of symmetric galvanostatic cycling.