화학공학소재연구정보센터
Journal of the American Ceramic Society, Vol.102, No.4, 1953-1960, 2019
Electrochemical and mechanical stability of LixLa0.557TiO3- perovskite electrolyte at various voltages
Perovskite LixLa0.557TiO3 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 LixLa0.557TiO3 (LLTO) under application relevant conditions, samples are charged (or discharged) to 0.2V, 3.2V, 4.0V, and 4.5V, respectively. The Li ion conductivity is 9.55x10(-5)S/cm at 3.2V and decreases obviously to 2.54x10(-5)S/cm as the voltage increases to 4.5V, whereas the value of the LLTO-0.2V is between that of LLTO-3.2V and LLTO-4.0V. 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.