期刊
CHEMISTRY OF MATERIALS
卷 33, 期 17, 页码 6713-6723出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.1c01123
关键词
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资金
- German Federal Ministry of Education and Research (BMBF) [03XP0093]
- BMBF [0XP0177A, 03XP0176C]
In this study, a dry-coating process using fumed lithium titanate (LTO) powder-based coating on Ni-rich oxide-based cathode active material (CAM) was applied to thiophosphate-based all-solid-state batteries (ASSBs) for the first time, resulting in significantly improved C-rate performance and long-term cycling stability. The enhanced electrochemical performance is attributed to reduced interfacial resistance between the coated cathode and solid electrolyte, as confirmed by in-depth electrochemical impedance spectroscopy analysis.
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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