Electrochemical and mechanical stability of LixLa0.557TiO3‐δ perovskite electrolyte at various voltages. Issue 4 (19th September 2018)

• Record Type: Journal Article
• Authors: Hu, Xitao; Yan, Gang; Cheng, Xu; Malzbender, Jürgen; Qiang, Wenjiang; Huang, Bingxin
• Is Part Of: Journal of the American Ceramic Society. Volume 102:Issue 4(2019)
• Page Start: 1953
• Page End: 1960
• Publication Date: 2018-09-19
• Subjects: electrochemical stability -- mechanical stability -- perovskite electrolyte -- solid‐state battery -- voltage gradient; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.16049
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: Perovskite Li x La0.557 TiO3 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 La0.557 TiO3 (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.