Journal article

Publication year: 2021

Pages: 6713-6723

Journal: Chemistry of Materials

Volume number: 33

Issue number: 17

ISSN: 0897-4756

DOI Link: https://doi.org/10.1021/acs.chemmater.1c01123

Publisher: American Chemical Society

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.

Harvard Citation style: Negi, R., Minnmann, P., Pan, R., Ahmed, S., Herzog, M., Volz, K., et al. (2021) Stabilizing the Cathode/Electrolyte Interface Using a Dry-Processed Lithium Titanate Coating for All-Solid-State Batteries, Chemistry of Materials, 33(17), pp. 6713-6723. https://doi.org/10.1021/acs.chemmater.1c01123

APA Citation style: Negi, R., Minnmann, P., Pan, R., Ahmed, S., Herzog, M., Volz, K., Takata, R., Schmidt, F., Janek, J., & Elm, M. (2021). Stabilizing the Cathode/Electrolyte Interface Using a Dry-Processed Lithium Titanate Coating for All-Solid-State Batteries. Chemistry of Materials. 33(17), 6713-6723. https://doi.org/10.1021/acs.chemmater.1c01123