“…While FeS is commonly studied as cathode material (CTM) anodes in sodium-ion batteries (SIBs), certain phases of FeS remain rarely reported. Lim et al designed carbon shell-coated mackinawite FeS platelets via a one-step low-temperature hydrothermal method for high-performance SIBs [ 109 ]. Traditionally, the synthesis of conversion anodes involves incorporating carbon materials into the process, followed by subsequent carbonization above 450 °C.…”
Section: Recent Progress Of the Development Of Anode Materials For Na...mentioning
confidence: 99%
“… Fig. 8 (a) The one-step hydrothermal reaction to synthesize carbon shell-coated mackinawite FeS platelet [ 109 ] and (b)i. Conventional method of fabricating anodes in metal-ion batteries (Agarwal et al, 2015), (b)ii.…”
Section: Recent Progress Of the Development Of Anode Materials For Na...mentioning
“…While FeS is commonly studied as cathode material (CTM) anodes in sodium-ion batteries (SIBs), certain phases of FeS remain rarely reported. Lim et al designed carbon shell-coated mackinawite FeS platelets via a one-step low-temperature hydrothermal method for high-performance SIBs [ 109 ]. Traditionally, the synthesis of conversion anodes involves incorporating carbon materials into the process, followed by subsequent carbonization above 450 °C.…”
Section: Recent Progress Of the Development Of Anode Materials For Na...mentioning
confidence: 99%
“… Fig. 8 (a) The one-step hydrothermal reaction to synthesize carbon shell-coated mackinawite FeS platelet [ 109 ] and (b)i. Conventional method of fabricating anodes in metal-ion batteries (Agarwal et al, 2015), (b)ii.…”
Section: Recent Progress Of the Development Of Anode Materials For Na...mentioning
Among various transition metal sulfides, iron‐based sulfides have attracted wide attention due to their abundant resources, low cost, and non‐toxicity, showing considerable research value in the field of secondary batteries. Thereinto, Fe3S4 has a high theoretical specific capacity of 785 mAh g−1. However, at present, the research related to Fe3S4 anode for sodium‐ion batteries (SIBs) is still in its infancy, and it also suffers from severe volume expansion and limited preparation. Therefore, to further boost its sodium storage potential, the Fe3S4@rGO composite with hierarchical structure and carbonaceous network is proposed in this study. Beneficial from the ingenious hierarchitectures and flexible graphene coating, the Fe3S4@rGO anode exhibits outstanding sodium storage performance, which can deliver a high capacity of 603 mAh g−1 after 1500 cycles with a superior capacity retention of 98%. The micron flower‐like structure composed of 2D nanosheets can provide sufficient active sites and promote the rapid transport of Na+. Meanwhile, the 3D interconnected graphene carbon network makes a crucial contribution to alleviating volume changes and enhancing electrical conductivity. This work reveals the application potential of Fe3S4 as an anode electrode for SIBs and provides available insights for the development of other electrode materials.
Iron sulfide (FeS) has been extensively studied as sodium‐ion battery anodes due to its high theoretical capacity (609 mAh g−1), but its large volume expansion and low electrical conductivity result in unsatisfactory cycling life and poor rate performance. Moreover, the sodium ion storage mechanism of FeS at a voltage range of 0.01–1 V involving conversion reactions and subsequent ion storage process is unclear yet. Here, the study proposes a vapor‐pressure induced synthesis route to fabricate FeS/C yolk‐shell structure that ultrathin carbon layers coat on the surface of FeS nanosheets, which can accommodate volume expansion of FeS during sodiation observed via in situ transmission electron microscope and improve its electrical conductivity. Remarkably, an in situ magnetometry reveals that vast spin‐polarized electrons can be injected into superparamagnetic Fe nanoparticles (≈3 nm) formed during conversion reaction to induce evolution of electrode magnetization between 0.01 and 1 V, during which spin‐polarized surface capacitance effect occurs at Fe/Na2S interfaces to increase extra ion storage and boost ion transport stably. Consequently, the FeS/C yolk‐shell nanosheets deliver a high reversible capacity of 664.9 mAh g−1 at 0.1 A g−1, and 300.4 mAh g−1 after 10 000 cycles at 10 A g−1 with a capacity retention of 81.1%.
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