Research Progress of FeS2 and Its Composites as Anode Materials for Sodium Ion Batteries
Ferrous disulfide(FeS2)is regarded as a promising anode material for sodium-ion batteries because of its high theoretical specific capacity,high conductivity,low price,and environmental friendli-ness.However,as a cathode material for sodium-ion batteries,FeS2 shows a large volume change and sluggish reaction kinetics during battery charging and discharging processes exhibits poor electrochemical performance due to its large volume change during charging and discharging processes,this poor electro-chemical performance of FeS2 seriously limits its large-scale application in sodium-ion batteries.Summariz-ing the reaction mechanism of FeS2 materials during the sodium-ion batteries working process,reviewing the studies of the solutions to the bottleneck of FeS2 cathode material in sodium-ion batteries,and explor-ing the future works to enhance the performance of FeS2 are crucial for the design of high-capacity sodium-ion batteries.From this point of view,this paper firstly described the structural properties and sodium storage mechanism of FeS2 cathode materials;then,the bottlenecks of FeS2 as an anode material for sodium-ion batteries were summarized based on the reaction mechanism and physical properties of FeS2;subsequently,solutions to the bottlenecks of FeS2 anode reported in recent years were summarized from four aspects,including the structure modulation of FeS2,FeS2/carbon composites,FeS2/polymer compos-ites and FeS2/metal-compound composites;finally,based on the above analysis,some feasible ways to enhance the performance of sodium-ion batteries with FeS2 cathode material were also provided,which include enhancing the electrolyte properties,regulating the electrode structure,reducing the cost,chang-ing the electrode substrate,and optimizing the working environment of the batteries.
FeS2sodium ion batteriescathode materialsodium storage mechanismmodification strategy
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