TY  - CONF
AU  - Odenwald, Philipp
AU  - Bauer, Alexander
AU  - Tsai, Chih-Long
AU  - Uhlenbruck, Sven
AU  - Fattakhova-Rohlfing, Dina
AU  - Guillon, Olivier
TI  - Superior sintering behavior and ionic conductivity: Facile coating methods for improved electrolyte materials
M1  - FZJ-2020-04200
PY  - 2020
AB  - Objective:Solid-state batteries are intensively investigated as a disruptive energy storage technology. Oxide and phosphate-based Li-ion conductors such as Li1.5Al0.5Ti1.5(PO4)3 (LATP) and Li6.45La3Zr1.6Ta0.4Al0.05O12 (LLZ) show properties like improved safety and electrochemical stability compared to incumbent Li-ion battery technologies, but also require treatment at elevated temperatures. We present advanced processing methods for these ceramic electrolyte materials. By applying various surface coatings on electrolyte particles and electrode-electrolyte interfaces we improved the sintering behavior and the electrode compatibility.Methods:LATP solid electrolyte powder was prepared by solution-assisted solid-state-reaction (SASSR), whereas LLZ was prepared via a solid state reaction. Sintering additives were dispersed along with the oxide-based electrolyte powder to perform screening tests. Further, wet coating methods employing organometallic precursors were developed for powders and planar substrates. The resulting solid electrolyte materials were characterized by X-ray diffraction (XRD), microscopic imaging and conductivity measurements.Results and discussion:A mixture of Al- and B-alkoxide was used to modify the conventional LATP. Phase-pure LATP was confirmed for pellets of modified and unmodified LATP by XRD, and the relative densities after sintering exceeded 90 % for both the modified and unmodified powder. Symmetric cells with the modified LATP-electrolyte and sputtered Au-electrodes showed an improved ionic conductivity at room temperature. Trilithium borate and lithium fluoride were identified as the most effective sintering additives among those investigated in conjunction with LLZ, yielding a relative density of 89 % and improved conductivity compared to conventional LLZ.
T2  - Batterieforum Deutschland 2020
CY  - 22 Jan 2020 - 24 Jan 2020, Berlin (Germany)
Y2  - 22 Jan 2020 - 24 Jan 2020
M2  - Berlin, Germany
LB  - PUB:(DE-HGF)24
UR  - https://juser.fz-juelich.de/record/885969
ER  -