721
Nasicon-Type Li-on Conductor for All-Solid-State Li-Ion Batteries
In past decades, a new family of lithium-ion conductors with Nasicon-type structure has attracted lots of interests due to its high bulk conductivity. However, several drawbacks prevent them from practical application such as low grain boundary conductivity and low electrochemical stability. [2]
To solve these problems, the present study is focused on optmizing the preparation process of an electrolyte material based on NASICON-type structure. A melting quench method has been adopted to eliminate the grain boundary resistance of Nasicon-type electrolyte Li1.5Al0.5Ge1.5P3O12 (LAGP) and the amorphous sheets are heat treated at different temperatures to investigate the relationship between microstructure and ionic conductivity. The highest total conductivity of 2.907x10-3S/cm at 27℃ has been achieved by crystallizing the glass at 800℃ for 8h and its activation energy is measured to be 0.27eV. Systematic characterizations on crystal structure and grain size are conducted to lead to further understandings on mechanism of lithium-ion transportation and grain growth kinetic.
References
[1] Thokchom, J.S., N. Gupta, and B. Kumar, Superionic Conductivity in a Lithium Aluminum Germanium Phosphate Glass-Ceramic. Journal of the Electrochemical Society, 2008. 155(12): p. A915-A920.
[2] Zhang, M., et al., Preparation and Electrochemical Properties of Li1+xAlxGe2-x(PO4)(3) Synthesized by a Sol-Gel Method. Journal of the Electrochemical Society, 2012. 159(7): p. A1114-A1119.