Please use this identifier to cite or link to this item: doi:10.22028/D291-37536
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Title: P2-type layered high-entropy oxides as sodium-ion cathode materials
Author(s): Wang, Junbo
Dreyer, Sören L.
Wang, Kai
Ding, Ziming
Diemant, Thomas
Karkera, Guruprakash
Ma, Yanjiao
Sarkar, Abhishek
Zhou, Bei
Gorbunov, Mikhail V.
Omar, Ahmad
Mikhailova, Daria
Presser, Volker
Fichtner, Maximilian
Hahn, Horst
Brezesinski, Torsten
Breitung, Ben
Wang, Qingsong
Language: English
Title: Materials futures
Volume: 1
Issue: 3
Publisher/Platform: IOP Science
Year of Publication: 2022
Free key words: P2-type layered cathode
high-entropy oxides
sodium-ion battery
gassing behavior
manganese leaching
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: P2-type layered oxides with the general Na-deficient composition Na x TMO2 (x < 1, TM: transition metal) are a promising class of cathode materials for sodium-ion batteries. The open Na+ transport pathways present in the structure lead to low diffusion barriers and enable high charge/discharge rates. However, a phase transition from P2 to O2 structure occurring above 4.2 V and metal dissolution at low potentials upon discharge results in rapid capacity degradation. In this work, we demonstrate the positive effect of configurational entropy on the stability of the crystal structure during battery operation. Three different compositions of layered P2-type oxides were synthesized by solid-state chemistry, 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 with low, medium and high configurational entropy, respectively. The high-entropy cathode material shows lower structural transformation and Mn dissolution upon cycling in a wide voltage range from 1.5 to 4.6 V. Advanced operando techniques and post-mortem analysis were used to probe the underlying reaction mechanism thoroughly. Overall, the high-entropy strategy is a promising route for improving the electrochemical performance of P2 layered oxide cathodes for advanced sodium-ion battery applications.
DOI of the first publication: 10.1088/2752-5724/ac8ab9
URL of the first publication:
Link to this record: urn:nbn:de:bsz:291--ds-375363
ISSN: 2752-5724
Date of registration: 11-Oct-2022
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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