Molecular surface coating of high-voltage cathodes in LPSCl-based all-solid-state lithium metal batteries
Université de Fribourg DOKPE
- Forster, Alexander University of Fribourg
- Zhang, Jinsong Paul Scherrer Institute, Switzerland
- Fadillah, Laras University of Fribourg
- Braks, Leonie University of Fribourg
- Fu, Tingting University of Geneva
- El Kazzi, Mario Paul Scherrer Institute, Switzerland
- Choi, Jang Wook ORCID Seoul National University
- Coskun, Ali ORCID University of Fribourg
- 2025
Published in:
- ACS Energy Letters. - 2025
English
Despite their improved safety, high energy density when paired with Li metal anode, all-solid-state batteries (ASSBs) continue to face significant challenges, notably the interface with the cathode active material (CAM), which is prone to both physical and (electro-)chemical degradation during cycling, especially when employing high-Ni CAMs. To address this issue, here, we introduced an organic surface anchoring strategy to stabilize the CAM surface and CAM-solid electrolyte interface using trifluoroacetamide (TFAA). A weak acid-base interaction between the CAM and TFAA creates a passivating layer, incorporating in-situ generated LiF, as a highly competitive alternative to conventional sol-gel-applied inorganic coating, i.e., LiNbO3 (LNO). Comparative electrochemical and physicochemical characterization of pristine, LNO-coated, and TFAA-coated NMC811 verified the efficiency of the organic anchoring strategy. Furthermore, we observed significant suppression in the formation of POx, SOx, and P-Sn-P species, indicating efficient mitigation of the (electro-)chemical oxidation of LPSCl at the interface, thus enabling an improved capacity retention of 95% after 100 cycles at 0.1 C.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Chimie
- Language
-
- English
- Classification
- Chemistry
- License
-
License undefined
- Open access status
- green
- Identifiers
- Persistent URL
- https://folia.unifr.ch/global/documents/333350
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