This paper investigates the distinct funtional characteristics of different metal ions in the electro-chemical energy storage process of layered sodium-ion batteries.Ni,Mn,Fe,Cu,and Ti were selected,and their compositions were adjusted to fabricate a novel cobalt-free high-entropy layered oxide cathode material,NaNi0.3Cuo.1Fe0.1Mn0.44Ti0.06O2,by using a combination of ball milling and high-temperature solid-state sintering methods.The rational combination and composition of elements enabled the high-entropy sample to exhibit low Na-vacancy ordering and high phase transition reversibility during charge-discharge processes,thereby demonstrating desirable electro-chemical performance.Under a relatively higher current density of 1 C,the specific capacity of the hybrid material remained stable at 123.6 mAh/g,indicating a stable structure and providing more Na-ion storage sites.Even after 200 cycles,the specific capacity remained at 104.6 mAh/g,with a capacity retention rate of 84.6％.
维普
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