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| Home > Publications database > Superior sintering behavior and ionic conductivity: Facile coating methods for improved electrolyte materials |
| Home > Publications database > Superior sintering behavior and ionic conductivity: Facile coating methods for improved electrolyte materials |
| Poster (After Call) | FZJ-2020-04200 |
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2020
Please use a persistent id in citations: http://hdl.handle.net/2128/26064
Abstract: 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.
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