Deniz Cihan Gündüz


Cationic Solid Electrolytes - Synthesis, Processing, Analysis and Characterization

SEM image of a LATP-ceramic sintered at 1000°C showing cuboidal grains and the presence of a secondary phase as well as pores Copyright: D.C. Gündüz

With the change to renewable energies the demand for energy storage systems increases. One quite established technology to store energy for mobile and stationary applications are lithium-ion batteries as they can provide high energy and high power densities.

The Li-ion batteries on the market work with liquid electrolytes. However, liquid electrolytes have the drawbacks of being inflammable and requiring a battery case, which reduces the specific and volumetric energy density.

Solid Electrolytes are non-inflammable, can block Li-dendrite growth and therefore provide a safer battery design with less inactive material. Among solid electrolytes, most promising are Garnet type materials like LLZO (Li5La3Zr2O12), NASICON type materials like Li1.3Al0.3Ti1.7(PO4)3 (LATP) and Sulphide lithium super ion conductors with glass-ceramic structure.

In this PhD project, the structure–property relation in solid electrolytes will be studied through electron microscopy, X-ray diffraction and electrochemical characterization. This might provide a basis to understand the role of the interfaces and secondary phases in electrochemical processes.