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Electrochemical and mechanical stability of Li x La 0.557 TiO 3‐ δ perovskite electrolyte at various voltages
Author(s) -
Hu Xitao,
Yan Gang,
Cheng Xu,
Malzbender Jürgen,
Qiang Wenjiang,
Huang Bingxin
Publication year - 2019
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.16049
Subject(s) - electrolyte , materials science , perovskite (structure) , electrochemistry , conductivity , lithium (medication) , ion , elastic modulus , indentation , analytical chemistry (journal) , composite material , chemistry , crystallography , electrode , medicine , organic chemistry , chromatography , endocrinology
Perovskite Li x La 0.557 TiO 3 electrolytes in all‐solid‐state lithium batteries are operated under a voltage gradient, which potentially induces the electrochemical and mechanical instability. To simulate the properties of Li x La 0.557 TiO 3 ( LLTO ) under application relevant conditions, samples are charged (or discharged) to 0.2 V, 3.2 V, 4.0 V, and 4.5 V, respectively. The Li ion conductivity is 9.55 × 10 −5 S/cm at 3.2 V and decreases obviously to 2.54 × 10 −5 S/cm as the voltage increases to 4.5 V, whereas the value of the LLTO ‐0.2 V is between that of LLTO ‐3.2 V and LLTO ‐4.0 V. In terms of mechanical behavior, elastic modulus ( E ), hardness ( H ), and fracture toughness ( K IC ) of LLTO operated at different voltages are also tested using depth‐sensitive indentation. The results can be used in the designing, monitoring and also improving of the battery cells.