Description
In the last decade, solid-state Li-ion conductors have been extensively investigated, and the mechanisms underlying the high ionic conductivity are reasonably well established. However, in the constructed solid-state Li-ion batteries (SSBs), the complex interfacial behaviors are still much less understood. Characterizing and understanding the dynamic processes at the solid/solid interface in SSBs is crucial for designing resilient, durable, and high-energy-density SSBs [1][2]. Coupling post-mortem analysis with in-situ and operando characterizations enables to study and understand the continuous evolution of the interfacial phenomena in SSBs.In this work, operando/in-situ XPS is carried out on the cross-section of SSBs (full-cell configuration) to enable access to the buried interfaces. The cross-section is prepared using an ion beam milling system, ensuring good preservation of the interfaces. An XPS-compatible electrochemical cell, capable of up to 1 MPa stack pressure and equipped with a heating stage, is employed to ensure realistic operando conditions. Moreover, the operando XPS can be combined with the in-house developed operando odd random phase electrochemical impedance spectroscopy (ORP-EIS)[3], monitoring the chemical and electrochemical properties simultaneously. In this work, the SSBs consist of state-of-the-art sulfide-based solid electrolytes, Ni-rich cathode materials, and Li metal anodes. Sulfide-based electrolytes are promising candidates due to their higher ionic conductivity and ease of processability compared to oxide solid electrolytes. However, their narrow electrochemical stability window causes undesirable electrolyte decomposition[4]. A deep understanding of these highly dynamic interfacial conditions can contribute to better materials design for commercially viable sulfide-based SSBs.
| Periode | 17 aug 2024 → 23 aug 2024 |
|---|---|
| Evenementstitel | 75th ISE Annual Meeting |
| Evenementstype | Conference |
| Locatie | Montreal, Canada |
| Mate van erkenning | International |