A sustainable approach for scalable production of α-Fe2O3 nanocrystals with 3D interconnected porous architectures on flexible carbon textiles as integrated electrodes for lithium-ion batteries

Graphitic Carbon-Doped Mesoporous Fe2O3 Nanoparticles for Long-Life Li-Ion Anodes

“…observed in both CV curves, being in line with the oxidation of Fe 0 to Fe 3+ in Fe 2 O 3 and the decomposition of Li 2 O 29. During the following third and fifth scan process, the irreversible reduction peaks of Fe 2 O 3 /C 400 and Fe 2 O 3 /C 450 electrode materials move to 0.82 and 0.78 V, both of which exhibit low peak intensity and small integral area.…”

“…During the first cathode scan process, the Fe 2 O 3 /C 400 and Fe 2 O 3 /C 450 electrode materials show sharp reduction peaks at 0.58 and 0.46 V with the first irreversible conversion reaction being ascribed to the reduction of Fe 3+ in α-Fe 2 O 3 to Fe 0 , the decomposition of electrolyte, as well as the generation of Li 2 O and solid electrolyte interface (SEI) film . Then, in the first anodic scan process, a wide oxidation peak at around 1.70 V is observed in both CV curves, being in line with the oxidation of Fe 0 to Fe 3+ in Fe 2 O 3 and the decomposition of Li 2 O . During the following third and fifth scan process, the irreversible reduction peaks of Fe 2 O 3 /C 400 and Fe 2 O 3 /C 450 electrode materials move to 0.82 and 0.78 V, both of which exhibit low peak intensity and small integral area.…”

“…Such better performance mainly relates to the inherent properties of the graphitic carbon-doped mesoporous Fe 2 O 3 hierarchical structure obtained from the PB template. Except for the important role of graphitic carbon described above, the small-size nanoparticles (∼28 nm) enhance the redox reactivity of the nanomaterial and shorten the path for Li + diffusion during insertion/extraction . Uniform mesopores (2 nm) make for facilitating the diffusion and transport of electrolyte/Li + ions, especially their cooperation with graphitic-C can effectively relieve the volume change of active materials .…”

“…Except for the important role of graphitic carbon described above, the smallsize nanoparticles (∼28 nm) enhance the redox reactivity of the nanomaterial and shorten the path for Li + diffusion during insertion/extraction. 33 Uniform mesopores (2 nm) make for facilitating the diffusion and transport of electrolyte/Li + ions, especially their cooperation with graphitic-C can effectively relieve the volume change of active materials. 34 The large specific surface area of 114 m 2 g −1 ensures the full contact of the active material with the electrolyte, thus accelerating the generation of a stable SEI film and increasing the surface-active sites for chemical reactions.…”

Flexible Free-Standing Fe2O3 Nanoparticle/Carbon Shells/Graphene Films for Advanced Lithium-Ion Batteries

“…Tremendous attempts have been devoted to circumventing the aforementioned drawbacks; one effective strategy is to adopt nanoscale Fe 2 O 3 to minimize its volume variation, reduce the Li + diffusion pathway, and offer more electrochemical reaction active sites. − Another promising strategy is integration with various carbonaceous materials, which can act as a matrix to confine the Fe 2 O 3 nanoparticles (NPs) and enhance the cycling reversibility. − In our previous work, we fabricated a unique three-dimensional (3D) anode nanocomposite of Fe 3 O 4 @C nanoballs anchored on a reduced graphene oxide (RGO) aerogel via a facile hydrothermal strategy, which achieved a high retained capacity of 634 mAh·g –1 upon 1000 cycles at a high rate of 7C . Even though these composite structures enhance the strain tolerance and electronic conductivity, their mechanical structure is not stable enough to suppress the great volumetric variation of Fe 2 O 3 , which results in a poor rate capability.…”