Experimental analysis shows how element selection modifies electrochemical properties in high-entropy materials, indicating performance improvements.
The application potential of layered oxides for sodium-ion batteries is expanded by the entropy stabilization strategy. However, specific research on the selection of elements and interpretation of the function of high-entropy materials are limited. In this study, we have developed several types of high-entropy materials, NaNi0.25Fe0.15Mn0.3Ti0.1Sn0.05Co0.05Li0.1O2 (HEO-TS), NaNi0.25Fe0.15Mn0.3Ti0.05Sn0.1Co0.05Li0.1O2 (HEO-ST), NaNi0.25Fe0.15Mn0.3Ti0.15Co0.05Li0.1O2 (HEO-Ti), and NaNi0.25Fe0.15Mn0.3Sn0.15Co0.05Li0.1O2 (HEO-Sn). Through the analysis of the physical and electrochemical properties, the introduction of Ti into the transition metal layer enhances air stability and rate performance. It exhibits excellent electrochemical properties under a high voltage. Furthermore, the partial introduction of Sn4+ increases the voltage difference of redox potential and electrochemical polarization. When the transition metal layer contains a large amount of Sn, the material exhibits poor electrochemical properties and struggles to form high crystallinity cathode materials. This work provides a solution for the element design of high-entropy layered oxides and investigates the relationship between the elements and electrochemical properties.
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Li et al. (2025) studied this question.
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