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000481952 1001_ $$0P:(DE-HGF)0$$aWang, Junbo$$b0
000481952 245__ $$aP2-Type Layered High-Entropy Oxides as Sodium-Ion Cathode Materials
000481952 260__ $$aBristol$$bIOP Science$$c2022
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000481952 520__ $$aP2-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, combined with 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.
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000481952 7001_ $$0P:(DE-HGF)0$$aDreyer, Sören Lukas$$b1
000481952 7001_ $$0P:(DE-HGF)0$$aWang, Kai$$b2
000481952 7001_ $$0P:(DE-HGF)0$$aDing, Ziming$$b3
000481952 7001_ $$0P:(DE-HGF)0$$aDiemant, Thomas$$b4
000481952 7001_ $$0P:(DE-H253)PIP1087985$$aMa, Yanjiao$$b5
000481952 7001_ $$0P:(DE-HGF)0$$aGuruprakash, Karkera$$b6
000481952 7001_ $$0P:(DE-H253)PIP1085676$$aSarkar, Abhishek$$b7
000481952 7001_ $$0P:(DE-H253)PIP1097994$$aZhou, Bei$$b8
000481952 7001_ $$0P:(DE-H253)PIP1086180$$aGorbunov, Mikhail$$b9
000481952 7001_ $$0P:(DE-H253)PIP1032974$$aOmar, Ahmad$$b10
000481952 7001_ $$0P:(DE-H253)PIP1008118$$aMikhailova, Daria$$b11
000481952 7001_ $$0P:(DE-HGF)0$$aPresser, Volker$$b12
000481952 7001_ $$0P:(DE-HGF)0$$aFichtner, Maximilian$$b13
000481952 7001_ $$0P:(DE-H253)PIP1015544$$aHahn, Horst$$b14
000481952 7001_ $$0P:(DE-H253)PIP1007361$$aBrezesinski, Torsten$$b15
000481952 7001_ $$0P:(DE-H253)PIP1092794$$aBreitung, Ben$$b16$$eCorresponding author
000481952 7001_ $$0P:(DE-H253)PIP1094144$$aWang, Qingsong$$b17$$eCorresponding author
000481952 773__ $$0PERI:(DE-600)3106737-2$$a10.1088/2752-5724/ac8ab9$$gVol. 1, no. 3, p. 035104 -$$n3$$p035104 $$tMaterials futures$$v1$$x2752-5724$$y2022
000481952 8564_ $$uhttps://iopscience.iop.org/article/10.1088/2752-5724/ac8ab9
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