P2-type layered high-entropy oxides as sodium-ion cathode materials
نویسندگان
چکیده
Abstract P2-type layered oxides with the general Na-deficient composition Na x TMO 2 ( < 1, TM: transition metal) are a promising class of cathode materials for sodium-ion batteries. The open + transport pathways present in structure lead to low diffusion barriers and enable high charge/discharge rates. However, phase from P2 O2 occurring above 4.2 V metal dissolution at potentials upon discharge results rapid capacity degradation. In this work, we demonstrate positive effect configurational entropy on stability crystal during battery operation. Three different compositions were synthesized by solid-state chemistry, 0.67 (Mn 0.55 Ni 0.21 Co 0.24 )O , 0.45 0.18 Ti 0.1 Mg 0.03 Al 0.04 Fe 0.02 low, medium entropy, respectively. high-entropy material shows lower structural transformation Mn cycling wide voltage range 1.5 4.6 V. Advanced operando techniques post-mortem analysis used probe underlying reaction mechanism thoroughly. Overall, strategy is route improving electrochemical performance oxide cathodes advanced applications.
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ژورنال
عنوان ژورنال: Materials futures
سال: 2022
ISSN: ['2752-5724']
DOI: https://doi.org/10.1088/2752-5724/ac8ab9