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

Author:

Wang Junbo,Dreyer Sören L,Wang Kai,Ding Ziming,Diemant ThomasORCID,Karkera GuruprakashORCID,Ma YanjiaoORCID,Sarkar AbhishekORCID,Zhou Bei,Gorbunov Mikhail VORCID,Omar AhmadORCID,Mikhailova DariaORCID,Presser VolkerORCID,Fichtner MaximilianORCID,Hahn HorstORCID,Brezesinski TorstenORCID,Breitung BenORCID,Wang QingsongORCID

Abstract

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.

Funder

Helmholtz-Gemeinschaft

Deutsche Forschungsgemeinschaft

European Union´s Horizon 2020

Bundesministerium für Bildung und Forschung

China Scholarship Council

Publisher

IOP Publishing

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