Synthesis and characterization of porous-crystalline C/Fe3O4 microspheres by spray pyrolysis with steam oxidation as anode materials for Li-ion batteries

Adi, Akylbek; Taniguchi, Izumi

doi:10.1016/j.apt.2022.103606

Cited by 15 publications

(8 citation statements)

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“…These internal void spaces were generated from the transformation of the iron oxide (Fe 3 O 4 ) precursor into Fe 3 C nanocrystals as well as the removal of surface functional groups during thermal reduction. 38 High-resolution TEM further confirmed the formation of these internal void spaces as well as the presence From the above results, it can be concluded that a facile spray pyrolysis process followed by thermal reduction produced porous graphitic C/Fe 3 C microspheres. The thermal reduction created a range of micro-and mesopores for physically adsorbing polysulfides as well as evenly dispersed Fe 3 C nanoparticles to promote fast conversion and nucleation of soluble polysulfides.…”

Section: ■ Results and Discussionmentioning

confidence: 60%

“…The C/Fe 3 C microspheres contain numerous void spaces, which contribute to a total pore volume of the microspheres. These internal void spaces were generated from the transformation of the iron oxide (Fe 3 O 4 ) precursor into Fe 3 C nanocrystals as well as the removal of surface functional groups during thermal reduction . High-resolution TEM further confirmed the formation of these internal void spaces as well as the presence of hollow Fe 3 C nanocrystals (as shown in Figure d).…”

Section: Resultsmentioning

confidence: 84%

“…The rate performance of the porous crystalline C/Fe 3 O 4 microspheres previously reported was included to compare the effect of Fe 3 O 4 and Fe 3 C nanoparticles on the Li–S cell performance . It is noteworthy that both the C/Fe 3 O 4 and C/Fe 3 C microspheres share a similar microstructure and degree of graphitization in their carbon matrices . The cells utilizing the modified separators exhibited improved rate performances at all current densities compared to that with the bare PP separator.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of an Advanced Sulfur Cathode with a Porous Graphitic C/Fe₃C Electrocatalyst and Three-Dimensional Current Collector for Li–S Batteries

Adi,

Taniguchi

2023

Energy Fuels

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This work reports on the synthesis of an advanced sulfur cathode incorporating porous graphitic C/Fe 3 C microspheres as an electrocatalyst and carbon fiber paper (CFP) as a three-dimensional (3D) current collector through vacuum filtration. This facile strategy eliminates the need for high-surface-area carbon materials, metal current collectors, and the associated complex procedures. As a 3D current collector, CFP provides efficient pathways for the rapid transfer of electrons and offers additional nucleation sites for the deposition of end redox products. The C/Fe 3 C microspheres are prepared using spray pyrolysis with thermal reduction, which created a range of micro-and mesopores for physically adsorbing polysulfides as well as evenly dispersed Fe 3 C nanoparticles for promoting fast conversion and nucleation. As a result, the optimum sulfur cathode retained approximately 96% of its initial capacity, achieving a specific capacity of around 1171 mAh g −1 after 100 cycles. This cathode also demonstrated superior rate performance, particularly at high current rates of 3.0, 4.0, and 5.0 C, delivering high capacities of ∼700, 600, and 500 mAh g −1 , respectively. This study highlights the potential for achieving high-performance Li−S batteries without confining sulfur in high-surface-area carbon materials and the complex procedures associated with them.

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Section: ■ Results and Discussionmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

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Synthesis of an Advanced Sulfur Cathode with a Porous Graphitic C/Fe₃C Electrocatalyst and Three-Dimensional Current Collector for Li–S Batteries

Adi,

Taniguchi

2023

Energy Fuels

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“…Lithium-ion batteries (LIBs), , which play an essential role as important energy storage devices, have greatly facilitated the development of new energy vehicles, intelligent electronics, and other devices − as a result of their merits of high energy density, stable cycling property and good ecological friendliness − and also effectively alleviated the energy crisis and environmental deterioration . However, it is difficult for the commercial graphite anode with a low theoretical specific capacity (372 mA h·g –1 ) to satisfy the requirements of large capacity and high energy density in the new era of carbon peak and carbon neutralization, − especially in the field of power batteries .…”

Section: Introductionmentioning

confidence: 99%

“…The oxidation/reduction characteristic peaks shift in the opposite potential directions with the scan rate increasing, indicating the significant polarization of the Fe 3 O 4 /FeS@C electrode. 72 The relationship between the peak redox current (i) and the corresponding scan rate (v) of each CV curve in the figure follows eq 1 3,72 i av b = (1) where a and b are variable values. When b = 0.5, it mainly refers to the behavior of diffusion control, and when b = 1, it belongs to the behavior of surface-controlled charge transfer, that is, the capacitance behavior.…”

Section: ■ Introductionmentioning

confidence: 99%

Interface Engineering of Space-Confined Fe₃O₄/FeS Heterostructures: Synergistic Effect and Ultrastable Li Storage

Zhang

Yin

et al. 2023

Ind. Eng. Chem. Res.

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Iron-based compounds, which feature the advantages of high specific capacity and inexpensive fabrication, are widely studied as promising anode candidates for the purpose of facilitating their electrical conductivity and structural integrity. Interface engineering and structural confinement are verified as effective methods to improve the sluggish charge transfer kinetics and rapid structural failure during the repeated lithiation/delithiation processes. In this work, we proposed a simple synthesis strategy to construct a space-confined Fe3O4/FeS heterostructure embedded in pyrolytic carbon (Fe3O4/FeS@C). The Fe3O4/FeS heterogeneous interface facilitates combination of the advantages of each component (Fe3O4 and FeS) and constructs a built-in electric field to promote the charge transport in the Fe3O4/FeS@C anode. The space-confined structure contributes to maintaining the structural stability by buffering the volumetric variation and suppressing the aggregation of active particles. Profiting from the synergism of the engineering of heterogeneous interfaces and the feature of confined structure, Fe3O4/FeS@C manifests an excellent rate capability (913.74 mA h·g–1 at 200 mA·g–1 and 535.79 mA h·g–1 at 6400 mA·g–1) and a stable cycling performance (439.8 mA h·g–1 after 1000 cycles at 3200 mA·g–1) as a competitive anode for lithium-ion batteries. The density functional theory (DFT) calculations demonstrate that the introduction of a heterogeneous interface enhances the adsorption of Li-ions, improves the electrical conductivity, as well as promotes interfacial electron/ion transfer kinetics.

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Synthesis of porous C/Fe3O4 microspheres by spray pyrolysis with NaNO3 additive for lithium-ion battery applications

Adi

Taniguchi

2023

J Solid State Electrochem

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In this work, we successfully synthesized porous C/Fe3O4 microspheres by spray pyrolysis at 700ºC with a sodium nitrate (NaNO3) additive in the precursor solution. Furthermore, we studied their electrochemical properties as anode material for Li-ion batteries. The systematic studies by various characterization techniques show that NaNO3 catalyzes the carbonization of sucrose and enhances the crystallization of Fe3O4. Moreover, an aqueous etching can easily remove sodium compounds to produce porous C/Fe3O4 microspheres with large surface areas and pore volumes. The porous C/Fe3O4 microspheres exhibit a reversible capacity of ~780 mAh g–1 in the initial cycles and ~520 mAh g–1 after 30 cycles at a current density of 50 mA g–1. Moreover, a reversible capacity of ~400 mAh g–1 is attainable after 200 cycles, even at a high current density of 500 mA g–1. The wide range of pores produced from the removal of sodium compounds might enable easy electrolyte penetration and facilitate fast Li-ion diffusion, while the N-doping can promote the electronic conductivity of the carbon. These features of porous C/Fe3O4 microspheres led to the improved electrochemical properties of this sample. Graphical Abstract

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Synthesis and characterization of porous-crystalline C/Fe3O4 microspheres by spray pyrolysis with steam oxidation as anode materials for Li-ion batteries

Cited by 15 publications

References 58 publications

Synthesis of an Advanced Sulfur Cathode with a Porous Graphitic C/Fe₃C Electrocatalyst and Three-Dimensional Current Collector for Li–S Batteries

Synthesis of an Advanced Sulfur Cathode with a Porous Graphitic C/Fe₃C Electrocatalyst and Three-Dimensional Current Collector for Li–S Batteries

Interface Engineering of Space-Confined Fe₃O₄/FeS Heterostructures: Synergistic Effect and Ultrastable Li Storage

Synthesis of porous C/Fe3O4 microspheres by spray pyrolysis with NaNO3 additive for lithium-ion battery applications

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Synthesis and characterization of porous-crystalline C/Fe3O4 microspheres by spray pyrolysis with steam oxidation as anode materials for Li-ion batteries

Cited by 15 publications

References 58 publications

Synthesis of an Advanced Sulfur Cathode with a Porous Graphitic C/Fe3C Electrocatalyst and Three-Dimensional Current Collector for Li–S Batteries

Synthesis of an Advanced Sulfur Cathode with a Porous Graphitic C/Fe3C Electrocatalyst and Three-Dimensional Current Collector for Li–S Batteries

Interface Engineering of Space-Confined Fe3O4/FeS Heterostructures: Synergistic Effect and Ultrastable Li Storage

Synthesis of porous C/Fe3O4 microspheres by spray pyrolysis with NaNO3 additive for lithium-ion battery applications

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Product

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Synthesis of an Advanced Sulfur Cathode with a Porous Graphitic C/Fe₃C Electrocatalyst and Three-Dimensional Current Collector for Li–S Batteries

Synthesis of an Advanced Sulfur Cathode with a Porous Graphitic C/Fe₃C Electrocatalyst and Three-Dimensional Current Collector for Li–S Batteries

Interface Engineering of Space-Confined Fe₃O₄/FeS Heterostructures: Synergistic Effect and Ultrastable Li Storage