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Gassing Behavior of High-Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry

Title data

Breitung, Ben ; Wang, Qingsong ; Schiele, Alexander ; Tripković, Đorđije ; Sarkar, Abhishek ; Velasco, Leonardo ; Wang, Di ; Bhattacharya, Subramshu S. ; Hahn, Horst ; Brezesinski, Torsten:
Gassing Behavior of High-Entropy Oxide Anode and Oxyfluoride Cathode Probed Using Differential Electrochemical Mass Spectrometry.
In: Batteries & Supercaps. Vol. 3 (2020) Issue 4 . - pp. 361-369.
ISSN 2566-6223
DOI: https://doi.org/10.1002/batt.202000010

Official URL: Volltext

Project information

Project title:
Project's official title
Project's id
Nachwuchsgruppe Lehrstuhl für Anorganische Aktivmaterialien electrochemischer Speicher Dr. Qingsong Wang
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Abstract in another language

Abstract Multicomponent materials may exhibit favorable Li-storage properties because of entropy stabilization. While the first examples of high-entropy oxides and oxyfluorides show good cycling performance, they suffer from various problems. Here, we report on side reactions leading to gas evolution in Li-ion cells using rock-salt (Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)O (HEO) or Li(Co0.2Cu0.2Mg0.2Ni0.2Zn0.2)OF (Li(HEO)F). Differential electrochemical mass spectrometry indicates that a robust solid-electrolyte interphase layer is formed on the HEO anode, even when using an additive-free electrolyte. For the Li(HEO)F cathode, the cumulative amount of gases is found by pressure measurements to depend strongly on the upper cutoff potential used during cycling. Cells charged to 5.0 V versus Li+/Li show the evolution of O2, H2, CO2, CO and POF3, with the latter species being indirectly due to lattice O2 release as confirmed by electron energy loss spectroscopy. This result attests to the negative effect that lattice instability at high potentials has on the gassing.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: lithium-ion battery; rock-salt structure; entropy stabilization; interfacial reactivity; oxygen evolution
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Research Institutions > Research Centres > Bayerisches Zentrum für Batterietechnik - BayBatt
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: No
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 02 Nov 2022 10:42
Last Modified: 02 Nov 2022 10:42
URI: https://eref.uni-bayreuth.de/id/eprint/72600