Title data
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:
P2-type layered high-entropy oxides as sodium-ion cathode materials.
In: Materials Futures.
Vol. 1
(September 2022)
Issue 3
.
- No. 035104.
ISSN 2752-5724
DOI: https://doi.org/10.1088/2752-5724/ac8ab9
Project information
Project title: |
Project's official title Project's id Nachwuchsgruppe Lehrstuhl für Anorganische Aktivmaterialien electrochemischer Speicher Dr. Qingsong Wang No information |
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Abstract in another language
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.
Further data
Item Type: | Article in a journal |
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Refereed: | Yes |
Institutions of the University: | 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 Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Research Institutions Research Institutions > Research Centres |
Result of work at the UBT: | No |
DDC Subjects: | 500 Science > 500 Natural sciences 600 Technology, medicine, applied sciences > 620 Engineering |
Date Deposited: | 02 Nov 2022 07:30 |
Last Modified: | 03 Nov 2022 12:15 |
URI: | https://eref.uni-bayreuth.de/id/eprint/72580 |