Volltext-Downloads (blau) und Frontdoor-Views (grau)

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

  • 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.

Download full text files

Export metadata

Additional Services

Share in Twitter Search Google Scholar


Document Type:Article
Author:Junbo Wang, Sören L. Dreyer, Kai Wang, Ziming Ding, Thomas DiemantORCiD, Guruprakash KarkeraORCiD, Yanijiao MaORCiD, Abhishek SarkarORCiD, Bei Zhou, Mikhail V. GorbunovORCiD, Ahmad OmarORCiD, Daria MikhailovaORCiD, Volker PresserORCiD, Maximilian FichtnerORCiD, Horst HahnORCiD, Torsten BrezesinskiORCiD, Ben BreitungORCiD, Qingsong WangORCiD
Parent Title (English):Materials Futures
First Page:035104
Year of first Publication:2022
Release Date:2022/09/28
Tag:P2-type layered cathode; gassing behavior; high-entropy oxides; manganese leaching; sodium-ion batteries
Funding Information:China Scholarship Council (CSC); Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy, EXC 2154, project number 390874152; Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung, BMBF) under the project ‘KaSiLi’ (03XP0254D) in the competence cluster ‘ExcellBattMat’; German Research Foundation ( Grant No. HA 1344/43-1); European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 730957 and 101017709; Kera-Solar project (Carl Zeiss Foundation)
DDC classes:500 Naturwissenschaften und Mathematik / 540 Chemie
Open Access:Open Access
Signature:INM 2022/091
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International