Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.307
Publication date: 18th July 2023
Transition-metal based layered compounds are considered as promising cathode materials in sodium-ion batteries (SIBs), in which sodium ions (Na+) can occupy the interstitial sites. [1] In addition to the typical transition-metal (cationic) redox activities, the anions in layered compounds, such as the lattice oxygen or sulfur, may also participate in the electrochemical redox reactions during sodiation/desodiation process. [2] Although layered oxides are very promising cathode materials for SIBs, there are still limitations such as voltage fade due to ion migration and loss of molecular oxygen during overcharging. [3,4] Therefore, replacing oxygen with sulfur and designing layered sulfide compounds with reversible anionic redox activities are promising for next generation of cathode for SIBs.
Titanium (Ti), as a transition metal element with abundant resources, has attracted considerable attention. In our study, we synthesized a series of Ti-based layered sulfide compounds and investigated them as cathode materials in SIBs. Through the utilization of several synchrotron radiation techniques, phase transitions and redox processes during sodiation and desodiation are comprehensively explored. Furthermore, electrolyte-dependent electrochemical behaviors of layered sulfide compounds are also investigated. These investigations can offer valuable insights into the working mechanisms of Ti-based sodium layered sulfide compounds, providing reference information for the design of layered sulfide cathode materials for SIBs in the future.
This project received funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No. [864698], SEED). Parts of the experiments were carried out at the KMC-3 beamline at the BESSY II electron storage ring, operated by the Helmholtz-Zentrum Berlin für Materialien und Energie, GmbH. We thank Dr. Michael Haumann and Dr. Götz Schuck for their assistance during the experiments. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at PETRA III and we thank Dr. Volodymyr Baran for assistance in using beamline P02.1. Beamtime was allocated for proposal I-20221303.
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