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

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

Project information

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Project's official title
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Nachwuchsgruppe Lehrstuhl für Anorganische Aktivmaterialien electrochemischer Speicher Dr. Qingsong Wang
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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
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 > 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