Grain boundary resistance of fast lithium ion conductors: Comparison between a lithium-ion conductive Li-Al-Ti-P-O-type glass ceramic and a Li(1.5)A(10.5)Ge(1.5)P(3)O(12) ceramic

作者：Mariappan Chinnasamy R^*; Gellert Michael; Yada Chihiro; Rosciano Fabio; Roling Bernhard

来源：Electrochemistry Communications, 2012, 14(1): 25-28.

DOI：10.1016/j.elecom.2011.10.022

• Fast lithium-ion conductors
• LATP
• LAGP
• Grain boundary resistance

The structure and ionic conductivity of a lithium-ion conductive Li-Al-Ti-P-O-type glass ceramic (LATP) was studied by means of powder X-ray diffraction, transmission electron microscopy, and broadband impedance spectroscopy. The results were compared to a Li1.5Al0.5Ge1.5P3O12 (LAGP) ceramic. While the grain conductivity of LATP is higher than that of LAGP, the total conductivity of LATP is lower due to a large grain boundary resistance. The grain boundary resistance of LATP is characterized by a slightly higher activation energy and a slightly higher pre-exponential factor than the grain resistance. Our results indicate that the origin of the grain boundary resistance in these fast lithium ion conductors is clearly distinct from oxide ion conductors.

• 出版日期2012-1