TY - JOUR
T1 - Microstructural and Electrochemical Properties of Alkaline Earth Metal-Doped Li Garnet-Type Solid Electrolytes Prepared by Solid-State Sintering and Spark Plasma Sintering Methods
AU - Kammampata, Sanoop Palakkathodi
AU - Basappa, Rajendra Hongahally
AU - Ito, Tomoko
AU - Yamada, Hirotoshi
AU - Thangadurai, Venkataraman
N1 - Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/3/25
Y1 - 2019/3/25
N2 - Li-stuffed garnet-type solid Li-ion electrolytes have been considered as a promising candidate for all-solid-state Li batteries. In this work, alkaline earth metal-doped Li garnet-type solid Li-ion electrolytes, Li6.5La2.5A0.5TaZrO12 (A = Ca, Sr, Ba) were prepared by conventional solid-state sintering (CSS) and spark plasma sintering (SPS) methods. The effect of sintering methods on the structural and electrochemical properties of the solid electrolytes was investigated by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). Among the investigated compounds, Sr-doped garnet-type Li6.5La2.5Sr0.5TaZrO12 prepared by the SPS method showed the highest Li-ion conductivity of 3.08 × 10-4 S cm-1 at 20 °C and the lowest activation energy of 0.35 eV. Both Sr- and Ba-doped samples exhibited a critical current density of 0.15 mA cm-2, and the Sr-doped Li6.5La2.5Sr0.5TaZrO12 sample showed the lowest Li-ion charge-transfer resistance of 139 ω cm2 at room temperature.
AB - Li-stuffed garnet-type solid Li-ion electrolytes have been considered as a promising candidate for all-solid-state Li batteries. In this work, alkaline earth metal-doped Li garnet-type solid Li-ion electrolytes, Li6.5La2.5A0.5TaZrO12 (A = Ca, Sr, Ba) were prepared by conventional solid-state sintering (CSS) and spark plasma sintering (SPS) methods. The effect of sintering methods on the structural and electrochemical properties of the solid electrolytes was investigated by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), and electrochemical impedance spectroscopy (EIS). Among the investigated compounds, Sr-doped garnet-type Li6.5La2.5Sr0.5TaZrO12 prepared by the SPS method showed the highest Li-ion conductivity of 3.08 × 10-4 S cm-1 at 20 °C and the lowest activation energy of 0.35 eV. Both Sr- and Ba-doped samples exhibited a critical current density of 0.15 mA cm-2, and the Sr-doped Li6.5La2.5Sr0.5TaZrO12 sample showed the lowest Li-ion charge-transfer resistance of 139 ω cm2 at room temperature.
KW - doping
KW - ionic conductivity
KW - Li-ion charge transfer
KW - Li-stuffed garnets
KW - sintering
UR - http://www.scopus.com/inward/record.url?scp=85064804330&partnerID=8YFLogxK
U2 - 10.1021/acsaem.8b01899
DO - 10.1021/acsaem.8b01899
M3 - Article
AN - SCOPUS:85064804330
SN - 2574-0962
VL - 2
SP - 1765
EP - 1773
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 3
ER -