TU Darmstadt / ULB / TUprints

P2-type layered high-entropy oxides as sodium-ion cathode materials

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 (2022):
P2-type layered high-entropy oxides as sodium-ion cathode materials. (Publisher's Version)
In: Materials Futures, 1 (3), IOP Publishing, e-ISSN 2752-5724,
DOI: 10.26083/tuprints-00022384,
[Article]

[img] Text
mf_1_3_035104.pdf
Copyright Information: CC BY 4.0 International - Creative Commons, Attribution.

Download (3MB)
Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: P2-type layered high-entropy oxides as sodium-ion cathode materials
Language: English
Abstract:

P2-type layered oxides with the general Na-deficient composition NaxTMO₂ (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.

Journal or Publication Title: Materials Futures
Volume of the journal: 1
Issue Number: 3
Place of Publication: Darmstadt
Publisher: IOP Publishing
Collation: 14 Seiten
Uncontrolled Keywords: P2-type layered cathode, high-entropy oxides, sodium-ion battery, gassing behavior, manganese leaching
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 16 Sep 2022 09:07
Last Modified: 26 Sep 2022 07:56
DOI: 10.26083/tuprints-00022384
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-223846
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/22384
PPN: 49963859X
Export:
Actions (login required)
View Item View Item