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High entropy fluorides as conversion cathodes with tailorable electrochemical performance

Title data

Cui, Yanyan ; Sukkurji, Parvathy Anitha ; Wang, Kai ; Azmi, Raheleh ; Nunn, Alexandra M. ; Hahn, Horst ; Breitung, Ben ; Ting, Yin-Ying ; Kowalski, Piotr M. ; Kaghazchi, Payam ; Wang, Qingsong ; Schweidler, Simon ; Botros, Miriam:
High entropy fluorides as conversion cathodes with tailorable electrochemical performance.
In: Journal of Energy Chemistry. Vol. 72 (2022) . - pp. 342-351.
ISSN 2096-885X
DOI: https://doi.org/10.1016/j.jechem.2022.05.032

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
Nachwuchsgruppe Lehrstuhl für Anorganische Aktivmaterialien electrochemischer Speicher Dr. Qingsong WangNo information

Abstract in another language

With the recent development of high entropy materials, an alternative approach to develop advanced functional materials with distinctive properties that show improved values compared to conventional materials has been provided. The high entropy concept was later successfully transferred to metal fluorides and high entropy fluorides (HEFs) were successfully synthesized. Owing to their high theoretical specific capacities in energy storage applications, HEFs were utilized as cathode materials for lithium-ion batteries (LIBs) and their underlying storage mechanisms were investigated. Instead of a step-by-step reduction of each individual metal cation, the HEFs seem to exhibit a single-step reduction process, indicating a solid solution compound instead of merely a mixture of different metal fluorides. It was also observed that the electrochemical behavior of the HEFs depends on each individual incorporated element. Therefore, by altering the elemental composition, new materials that exhibit improved electrochemical properties can be designed. Remarkably, HEFs with seven incorporated metal elements exhibited a better cycling stability as well as a lower hysteresis compared to binary metal fluorides. These findings offer new guidelines for material design and tailoring towards high performance LIBs.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: High entropy materials; High entropy fluorides; Conversion cathodes; Tailored electrochemistry; Li-ion batteries
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Lehrstuhl Anorganische Aktivmaterialien für elektrochemische Energiespeicher
Research Institutions > Research Centres > Bayerisches Zentrum für Batterietechnik - BayBatt
Result of work at the UBT: No
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 540 Chemistry
Date Deposited: 02 Nov 2022 08:10
Last Modified: 02 Nov 2022 08:10
URI: https://eref.uni-bayreuth.de/id/eprint/72587