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Preparation and properties of Li x La 0.5 TiO 3 perovskite oxide electrolytes
Author(s) -
Hu Xitao,
Qiang Wenjiang,
Huang Bingxin
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14946
Subject(s) - materials science , fracture toughness , ionic conductivity , perovskite (structure) , fast ion conductor , modulus , lithium (medication) , young's modulus , electrolyte , solid solution , oxide , indentation , composite material , mineralogy , crystallography , chemistry , metallurgy , medicine , electrode , endocrinology
Abstract Solid electrolytes with high lithium ionic conductivity and outstanding mechanical stability are essential for all solid‐state lithium ion batteries. Perovskite Li x La 0.5 TiO 3 is one of the most promising as solid electrolytes candidates. Li x La 0.5 TiO 3 with various initial Li 2 O (0.5≤ x ≤0.569) is synthesized by traditional solid‐state reaction at high temperatures. The crystal structure is not remarkably affected by the Li 2 O quantity, yet higher porosity is obtained as a result of excess Li 2 O. The Young's modulus, hardness, and fracture toughness are evaluated with indentation method. The Young's modulus increases from 72 to 148 GPa with increasing Li 2 O, which means that a small variation of Li quantity in Li x La 0.5 TiO 3 results in over a 100% change in Young's modulus. However, the fracture toughness exhibits an opposite trend with that of the Young's modulus. The high Young's modulus and fracture toughness could guarantee the structural integrity during cycle operations.