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The effect of configurational entropy on acoustic emission of P2-type layered oxide cathodes for sodium-ion batteries

Title data

Dreyer, Sören L. ; Zhang, Ruizhuo ; Wang, Junbo ; Kondrakov, Aleksandr ; Wang, Qingsong ; Brezesinski, Torsten ; Janek, Jürgen:
The effect of configurational entropy on acoustic emission of P2-type layered oxide cathodes for sodium-ion batteries.
In: Journal of Physics: Energy. Vol. 5 (2023) Issue 3 . - 035002.
ISSN 2515-7655
DOI: https://doi.org/10.1088/2515-7655/acd41a

Abstract in another language

Sodium-ion batteries (SIBs) see intensive research and commercialization efforts, aiming to establish them as an alternative to lithium-ion batteries. Among the reported cathode material families for SIBs, Na-deficient P2-type layered oxides are promising candidates, benefiting from fast sodium diffusion and therefore high charge/discharge rates. However, upon sodium extraction at high potentials, a transition from the P2 to O2 phase occurs, with the corresponding change in cell volume resulting in particle fracture and capacity degradation. A possible solution to this is to increase configurational entropy by introducing more elements into the transition-metal layer (so-called high-entropy concept), leading to some kind of structural stabilization. In this work, the acoustic emission (AE) of a series of P2-type layered oxide cathodes with increasing configurational entropy Na0.67(Mn0.55Ni0.21Co0.24)O2, Na0.67(Mn0.45Ni0.18Co0.24Ti0.1Mg0.03)O2 and Na0.67(Mn0.45Ni0.18Co0.18Ti0.1Mg0.03Al0.04Fe0.02)O2 is recorded during SIB operation and correlated to the materials properties, namely change in c lattice parameter and cracking behavior. A structure-property relationship between entropy, manifested in the extent of phase transition, and detected AE is derived, supported by the classification of signals by peak frequency. This classification in combination with microscopy imaging allows to distinguish between inter- and intragranular fracture. Relatively more intergranular and less intragranular crack formation is observed with increasing configurational entropy.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Research Institutions > Central research institutes > 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: 24 Nov 2023 09:44
Last Modified: 24 Nov 2023 09:44
URI: https://eref.uni-bayreuth.de/id/eprint/87850