Synthesis of unit-cell-thick α-Fe2O3 nanosheets and their transformation to γ-Fe2O3 nanosheets with enhanced LIB performances

Jia, Ying; Dang, Liyun; Zhang, Hao; Song, Chaosheng; Lu, Qingyi; Gao, Feng

doi:10.1016/j.cej.2017.05.155

Cited by 67 publications

(30 citation statements)

References 44 publications

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“…This can be attributed to the irreversible phase changes and to the inevitable consequence of SEI film formation. 7,37 However, the coulombic efficiency improves during the subsequent cycles. The specific Li insertion and de-insertion capacities at 0.2 A g -1 are 873 and 860 mAh g -1 , respectively, with a coulombic efficiency of 98.5%.…”

Section: Electrochemical Characterization Of Fe2o3@c In Lipf6 and Litmentioning

confidence: 99%

Understanding the Lithium Storage Mechanism in Core–Shell Fe₂O₃@C Hollow Nanospheres Derived from Metal–Organic Frameworks: An In operando Synchrotron Radiation Diffraction and in operando X-ray Absorption Spectroscopy Study

Sarapulova

Zhao

et al. 2019

Chem. Mater.

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In this work, a core-shell structure Fe2O3@C hollow nanospheres derived from metal-organic frameworks is used as anode material for Liion batteries. This material delivers reversible capacity of 928 mAh g-1 at 0.2 A g-1 in 1 M LiPF6 in ethylene carbonate: dimethyl carbonate=1:1. While1 M Lithium bis (trifluoromethane sulfonyl) imide is used as conductive salt, it delivers only 644 mAh g-1 at 0.2 A g-1. In operando synchrotron radiation diffraction revealed that the intermediate phases LixFe2O3 (R3 ̅ m, hexagonal) and LixFe2O3 (Fd3 ̅ m, Li-lean) form and subsequently convert to LixFe2O3 (Fd3 ̅ m, Li-rich), which finally transforms into Fe, Li2O, and LixFe2O3 (Fd3 ̅ m, X phase). During the de-lithiation process, the material does not return to the initial Fe2O3 structure. Instead, the partially de-lithiated Lix-1Fe2O3 (Fd3 ̅ m, X phase) and an amorphous metallic Fe phase remain. The Fe K-edge transition and the formation of Fe are confirmed by the in operando X-ray absorption spectroscopy measurement. Furthermore, the resistive contributions of this material in the two type of Li-salt are evaluated by electrochemical impedance spectroscopy, which highlight a different type of solid electrolyte interphase induced by the salt. This work provides fundamental insights on understanding the lithium-ion storage mechanism in conversion-type electrodes.

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Section: Electrochemical Characterization Of Fe2o3@c In Lipf6 and Litmentioning

confidence: 99%

Understanding the Lithium Storage Mechanism in Core–Shell Fe₂O₃@C Hollow Nanospheres Derived from Metal–Organic Frameworks: An In operando Synchrotron Radiation Diffraction and in operando X-ray Absorption Spectroscopy Study

Sarapulova

Zhao

et al. 2019

Chem. Mater.

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“…The charge/discharge curves of the first five cycles of the FCF electrode at a current density of 0.1 A g −1 are shown in Figure b. The initial discharge platform at 0.8 V can be attributed to the insertion of lithium ions into the crystalline structure of α‐Fe 2 O 3 . During the charging process, a smooth voltage profile appears between 1.6 and 2.0 V, followed by a sharp rise to 3.0 V, which matches the reduction peak in the CV curve of Figure a.…”

Section: Resultsmentioning

confidence: 63%

A Simple and Low‐Cost Method to Synthesize Cr‐Doped α‐Fe₂O₃ Electrode Materials for Lithium‐Ion Batteries

et al. 2019

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Chromium-doped α-Fe 2 O 3 samples are successfully synthesized by using a ball-milling-assisted rheological phase method combined with heat treatment. The electronic properties of undoped α-Fe 2 O 3 and 4.0 at % Cr-doped α-Fe 2 O 3 are investigated by first-principles calculations. The calculation results show that Cr doping can reduce the band gap and impurity levels that appear in the band gap. The structure and morphology of the samples are evaluated by X-ray diffraction, field-emission scanning electron microscopy, and high-resolution transmission electron microscopy. The Cr-doped α-Fe 2 O 3 electrode delivers a higher reversible capacity and outstanding rate capability as the anode of a lithium-ion battery compared with the undoped α-Fe 2 O 3 electrode. The initial discharge/ charge capacities of the 4.0 at % Cr-doped α-Fe 2 O 3 electrode can reach 1624/1065.9 mAh g À 1 , respectively, and exhibit an excellent reversible capacity of 971.3 mAh g À 1 after 150 cycles at a current density of 0.1 A g À 1 . Even after 200 cycles, the capacity can remain as high as 758.1 mAh g À 1 at a current density of 0.5 A g À 1 , far beyond than that of the undoped α-Fe 2 O 3 electrode (376.5 mAh g À 1 ).

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“…Non‐vdW 2D materials include metals and metal chalcogenides, oxides, nitrides, and phosphides. The methods used to synthesize non‐vdW 2D materials are summarized in Table 1 and can be divided into three categories: confined synthesis (e.g., self‐assembly, [ 25–33 ] oriented attachment, [ 34–40 ] vdW exfoliation, [ 41–45 ] and self‐limited CVD, [ 46–55 ] ), topochemical synthesis (e.g., lamellar intermediate‐assisted exfoliation, [ 56–64 ] topochemical transformation, [ 65–75 ] and template‐assisted growth, [ 76–84 ] ), and other emerging strategies (e.g., repeating folding and calendaring, [ 85 ] electrophoretic synthesis, [ 86 ] 2D‐to‐3D transformation, [ 87 ] and so on. [ 88–90 ] ).…”

Section: Synthesis Methods For Non‐vdw 2d Materialsmentioning

confidence: 99%

Electronic Modulation of Non‐van der Waals 2D Electrocatalysts for Efficient Energy Conversion

et al. 2021

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The exploration of efficient electrocatalysts for energy conversion is important for green energy development. Owing to their high surface areas and unusual electronic structure, 2D electrocatalysts have attracted increasing interest. Among them, non‐van der Waals (non‐vdW) 2D materials with numerous chemical bonds in all three dimensions and novel chemical and electronic properties beyond those of vdW 2D materials have been studied increasingly over the past decades. Herein, the progress of non‐vdW 2D electrocatalysts is critically reviewed, with a special emphasis on electronic structure modulation. Strategies for heteroatom doping, vacancy engineering, pore creation, alloying, and heterostructure engineering are analyzed for tuning electronic structures and achieving intrinsically enhanced electrocatalytic performances. Lastly, a roadmap for the future development of non‐vdW 2D electrocatalysts is provided from material, mechanism, and performance viewpoints.

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Synthesis of unit-cell-thick α-Fe2O3 nanosheets and their transformation to γ-Fe2O3 nanosheets with enhanced LIB performances

Cited by 67 publications

References 44 publications

Understanding the Lithium Storage Mechanism in Core–Shell Fe₂O₃@C Hollow Nanospheres Derived from Metal–Organic Frameworks: An In operando Synchrotron Radiation Diffraction and in operando X-ray Absorption Spectroscopy Study

Understanding the Lithium Storage Mechanism in Core–Shell Fe₂O₃@C Hollow Nanospheres Derived from Metal–Organic Frameworks: An In operando Synchrotron Radiation Diffraction and in operando X-ray Absorption Spectroscopy Study

A Simple and Low‐Cost Method to Synthesize Cr‐Doped α‐Fe₂O₃ Electrode Materials for Lithium‐Ion Batteries

Electronic Modulation of Non‐van der Waals 2D Electrocatalysts for Efficient Energy Conversion

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Synthesis of unit-cell-thick α-Fe2O3 nanosheets and their transformation to γ-Fe2O3 nanosheets with enhanced LIB performances

Cited by 67 publications

References 44 publications

Understanding the Lithium Storage Mechanism in Core–Shell Fe2O3@C Hollow Nanospheres Derived from Metal–Organic Frameworks: An In operando Synchrotron Radiation Diffraction and in operando X-ray Absorption Spectroscopy Study

Understanding the Lithium Storage Mechanism in Core–Shell Fe2O3@C Hollow Nanospheres Derived from Metal–Organic Frameworks: An In operando Synchrotron Radiation Diffraction and in operando X-ray Absorption Spectroscopy Study

A Simple and Low‐Cost Method to Synthesize Cr‐Doped α‐Fe2O3 Electrode Materials for Lithium‐Ion Batteries

Electronic Modulation of Non‐van der Waals 2D Electrocatalysts for Efficient Energy Conversion

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Product

Resources

About

Understanding the Lithium Storage Mechanism in Core–Shell Fe₂O₃@C Hollow Nanospheres Derived from Metal–Organic Frameworks: An In operando Synchrotron Radiation Diffraction and in operando X-ray Absorption Spectroscopy Study

Understanding the Lithium Storage Mechanism in Core–Shell Fe₂O₃@C Hollow Nanospheres Derived from Metal–Organic Frameworks: An In operando Synchrotron Radiation Diffraction and in operando X-ray Absorption Spectroscopy Study

A Simple and Low‐Cost Method to Synthesize Cr‐Doped α‐Fe₂O₃ Electrode Materials for Lithium‐Ion Batteries