Ternary Fe₂O₃/Fe₃O₄/FeCO₃ Composite as a High-Performance Anode Material for Lithium-Ion Batteries

Abstract

Fe-based oxides have been recognized as one of the most promising anode materials for lithium-ion batteries (LIBs) due to their theoretical capacities, low cost, eco-friendliness, and natural abundance. However, poor cycling stability and low rate capability severely hindered their practical applications. Compared to single-component materials, multicomponent composites are more capable of achieving optimal electrochemical performance for electrode materials due to their synergetic effect. In this work, a novel ternary Fe2O3/Fe3O4/FeCO3 composite is fabricated by a facile hydrothermal method with FeCl2·4H2O and urea as raw materials. When evaluated as an anode material for LIBs, this ternary Fe2O3/Fe3O4/FeCO3 composite exhibits excellent rate capability (with reversible capacities of 624, 488, and 270 mAh g–1 at 1.0, 3.0, and 10.0 A g–1, respectively) and remarkable cycling stability (with a reversible capacity of 779 mAh g–1 after 300 cycles at 0.5 A g–1 and 410 mAh g–1 after 800 cycles at 3.0 A g–1), which are much superior to those of the single-component Fe2O3 material. It is found that the ternary Fe2O3/Fe3O4/FeCO3 composite possesses good structural integrity during cycling and fast electrochemical reaction kinetics, which result in excellent long-term cycling stability and enhanced high-rate capability. The results may provide clues for the rational structural design of high-performance Fe-oxide anode materials for next-generation LIBs.

Plasma Enabled Fe2O3/Fe3O4 Nano-aggregates Anchored on Nitrogen-doped Graphene as Anode for Sodium-Ion Batteries

“…In the anodic sweeps, broad anodic peaks around 1.5 V are ascribed to the oxidation of Fe 0 to Fe 3+ for both electrodes (insets in Figure 4a,b) [24,27]. Only the Fe2O3/Fe3O4/NG electrode has a small shoulder peak at 0.8 V (inset in Figure 4a), which is an indication of the oxidization of Fe 0 to Fe 2+ [19]. The lower peak-to-peak separation between the redox peaks and better coincidence of the sweeps of the Fe2O3/Fe3O4/NG suggest faster charge transfer kinetics and better reversibility.…”

Sodium ion storage performance and mechanism in orthorhombic V2O5 single-crystalline nanowires

“…2c presents the Nyquist plots of the electrode before cycling and after different discharge/charge cycles at 100 mA g −1 . Before cycling, the EIS plot shows only one depressed semicircle and an inclined line, which relate to charge transfer resistance (R ct ) at the electrode/electrolyte interface and Warburg impedance (Na + diffusion in electrode), respectively [40]; after the 1 st discharge/charge cycle, there appears an additional depressed semicircle in the high frequency region, which can be assigned to the resistance (R sf ) of Na + migrating through the solid electrolyte interface (SEI) film [41]. The formation of SEI layer on the surface of the active material can be discerned from the TEM image of the electrode after the 1 st discharge/charge cycle (Fig.…”

Preparation of Hollow Core–Shell Fe3O4/Nitrogen-Doped Carbon Nanocomposites for Lithium-Ion Batteries

“…The Molecules 2022, 27, 396 2 of 11 conversion reaction between transition metal oxides and lithium ion means that they have a high lithium storage capacity [18][19][20][21][22]: M x O y + 2yLi + + 2ye − = yLi 2 O + xM. In general, transition metal oxides have a significantly higher theoretical specific capacity than graphite when used as anode materials for lithium-ion batteries [23][24][25]. However, it is inevitable that transition metal oxides will experience large volume deformation during the cycling process, which leads to the pulverization of the electrode materials and also results in serious capacity fading [26][27][28][29].…”