Stabilizing the Cathode/Electrolyte Interface Using a Dry-Processed Lithium Titanate Coating for All-Solid-State BatteriesClick to copy article linkArticle link copied!
- Rajendra S. NegiRajendra S. NegiCenter for Materials Research (LaMa) Justus Liebig University Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, GermanyMore by Rajendra S. Negi
- Philip MinnmannPhilip MinnmannInstitute of Physical Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, D-35392 Giessen, GermanyMore by Philip Minnmann
- Ruijun PanRuijun PanInstitute of Physical Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, D-35392 Giessen, GermanyMore by Ruijun Pan
- Shamail AhmedShamail AhmedMaterials Science Centre and Faculty of Physics, Philipps University Marburg, Hans-Meerwein-Strasse 6, 35043 Marburg, GermanyMore by Shamail Ahmed
- Marcel J. HerzogMarcel J. HerzogEvonik Operations GmbH, Rodenbacher Chaussee 4, 63457 Hanau, GermanyMore by Marcel J. Herzog
- Kerstin VolzKerstin VolzMaterials Science Centre and Faculty of Physics, Philipps University Marburg, Hans-Meerwein-Strasse 6, 35043 Marburg, GermanyMore by Kerstin Volz
- Ryo Takata
- Franz SchmidtFranz SchmidtEvonik Operations GmbH, Rodenbacher Chaussee 4, 63457 Hanau, GermanyMore by Franz Schmidt
- Jürgen JanekJürgen JanekCenter for Materials Research (LaMa) Justus Liebig University Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, GermanyInstitute of Physical Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, D-35392 Giessen, GermanyMore by Jürgen Janek
- Matthias T. Elm*Matthias T. Elm*Email: [email protected]Center for Materials Research (LaMa) Justus Liebig University Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, GermanyInstitute of Physical Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, D-35392 Giessen, GermanyInstitute of Experimental Physics I, Justus Liebig University Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, GermanyMore by Matthias T. Elm
Abstract
Considering the high theoretical energy density and improved safety, thiophosphate-based all-solid-state batteries (ASSBs) have become one of the most promising candidates for next-generation energy storage systems. However, the intrinsic electrochemical instability of thiophosphate-based solid electrolytes in contact with oxide-based cathodes results in rapid capacity fading and has driven the need of protective cathode coatings. In this work, for the first time, a fumed lithium titanate (LTO) powder-based coating has been applied to Ni-rich oxide-based cathode active material (CAM) using a newly developed dry-coating process. The LTO cathode coating has been tested in thiophosphate-based ASSBs. It exhibits a significantly improved C-rate performance along with superior long-term cycling stability. The improved electrochemical performance is attributed to a reduced interfacial resistance between coated cathode and solid electrolyte as deduced from in-depth electrochemical impedance spectroscopy analysis. These results open up a new, facile dry-coating route to fabricate effective protective CAM coatings to enable long-life ASSBs. This nondestructive coating process with no post-heat-treatment approach is expected to simplify the coating process for a wide range of coatings and cathode materials, resulting in much improved cathode/electrolyte interfacial stability and electrochemical performance of ASSBs.
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