A cathode material based on the iron fluoride with an ultra-thin Li3FeF6 protective layer for high-capacity Li-ion batteries

Yang, Juan; Xu, Zhanglin; Zhou, Haidong; Tang, Jingjing; Sun, Hongxu; Ding, Jing; Zhou, Xiangyang

doi:10.1016/j.jpowsour.2017.07.091

Cited by 29 publications

(19 citation statements)

References 32 publications

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“…The diameter of the semicircle is associated with the charge‐transfer resistance ( R ct ) and the sloping line in the low‐frequency region is related to the diffusion impedance of Li + in the solid electrode. The FeOF/rGO electrode exhibited a smaller R ct (77.1 Ω; Table S2 in the Supporting Information) than that of bare FeOF (126.4 Ω), which indicated better electrode reaction kinetics of FeOF/rGO and was in agreement with the electroperformance results in Figure c and d. Moreover, the slopes of the lines for these two electrodes are similar, which indicates that the rGO layer does not hamper the transport of Li + …”

Section: Resultssupporting

confidence: 80%

“…The FeOF/rGO electrode exhibited as maller R ct (77.1 W; Ta ble S2 in the Supporting Information) than that of bare FeOF (126.4 W), which indicatedb etter electrode reactionk ineticso f FeOF/rGO and was in agreement with the electroperformance results in Figure 5c and d. Moreover,t he slopes of the lines for these two electrodes are similar, which indicates that the rGO layer does not hamper the transport of Li + . [27] The enhanced lithium-storage properties of FeOF/rGO could be derived from the following properties of the materials: 1) The starfish-like FeOF nanocrystals constructed from well-defined nanorods are favorable for enlarging the area accessible to the electrolyte, while greatlys hortening the lithium-ion diffusion pathways. 2) Such an architecture,a long with the stretchable rGO sheets,c an, to some extent,w ithstandv olume changes and avoid agglomeration during the Li + insertion/extraction process;t hus ensuring the integrity of the nanostructured electrode.…”

Section: Resultsmentioning

confidence: 99%

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3D Starfish‐Like FeOF on Graphene Sheets: Engineered Synthesis and Lithium Storage Performance

Zhai

Lei

Sun

2019

Chemistry A European J

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To address the problemsa ssociated with poor conductivity and large volumev ariation in practical applications as ac onversion cathode, engineering of hierarchical nanostructured FeOF coupled with conductive decoration is highly desired,y et rarely reported. Herein, 3D starfish-like FeOF on reduced graphene oxide sheets (FeOF/rGO) is successfully prepared, for the first time, through ac ombination of solvothermal reaction, self-assembly,a nd thermal reduction. Integratingt he structuralf eatureso ft he 3D hierarchical nanostructure, which favorably shorten the path for elec-tron/ion transport and alleviate volumetric changes, with those of graphene wrapping,w hich can further enhance the electricalc onductivity and maintain the structural stability of the electrode, the as-preparedFeOF/rGO composite exhibits as uperior lithium-storage performance, including ah igh reversible capacity (424.5 mA h À1 g À1 at 50 mA g À1 ), excellent stability( 0.016 %c apacityd ecay per cycle during 180 cycles), and remarkable rate capability (275.8 mA h À1 g À1 at 2000 mA g À1 ).Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

3D Starfish‐Like FeOF on Graphene Sheets: Engineered Synthesis and Lithium Storage Performance

Zhai

Lei

Sun

2019

Chemistry A European J

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“…The particular peak (1230 cm À 1 ) in FCN is considered to be derived from CÀ N stretching vibrations, which imply the nitrogen atoms were doped into the carbon skeleton. [67,68] Exothermic peaks at 400°C are considered to be caused by the oxidation of FeF 3 to Fe 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

“…The element mapping of those two samples were similar to that of FCN, the larger distribution region of F atoms indicated that there are also by-products. [67,68]…”

Section: Introductionmentioning

confidence: 99%

Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix

Zhu

et al. 2019

ChemElectroChem

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FeF 3 is favored by researchers because of its high theoretical specific capacity and high voltage. It is expected to be utilized as a cathode material for lithium-ion batteries in the future. However, the poor electronic conductivity, inferior reaction kinetics, and severe volume expansion seriously prevents its practical application. Herein, a FeF 3 @N-doped carbon nanocomposite was successfully produced by in situ fluorination and dehydration. In addition, the nanocomposite showed a reversible capacity of 84.9 mAh g À 1 for 200th cycle after cycling at a high current of 2 C, which is approximately 300 times higher than that of bare FeF 3 . Benefitting from the N-doped carbon matrix, the composite electrodes exhibited minor transfer resistance (117.4 Ω, only 44.0 % of that of bare FeF 3 ) and very low polarization voltage (ca. 0.19 V). Meanwhile, it provided a buffer for volume expansion during the insertion of Li + and maintained cycling stability. This work can supply a simple pathway for designing ultrahigh-rate and long-life FeF 3 cathode materials.

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“…Meanwhile, there are three diminutive peaks at 723.32 eV, 713.24 eV and 710.25 eV. The 723.32 eV peak can be attributed to the Fe-F bonds [44]. For the K2p spectrum ( Fig.…”

Section: Xps and Tga Testsmentioning

confidence: 94%

Hydrothermal synthesis of K3FeF6 and its electrochemical characterization as cathode material for lithium-ion batteries

2019

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K 3 FeF 6 was synthesized through a simple hydrothermal reaction for a novel cathode material of lithium-ion batteries. From the SEM and TEM images, the synthesized K 3 FeF 6 particle are about 30-50 nm after high energy ball milling. K 3 FeF 6 electrode delivers a high reversible capacity of 212.6 mAh g −1 and it maintained 131 mAh g −1 after 30 cycles. Additionally, in rate performance test, when the current density returns back to the 10 mA g −1 again, the full recovery of the capacity exhibits its superior rate performance. The electrochemical redox mechanism, herein studied through Ex-situ XRD of K 3 FeF 6 electrodes at different polarization voltages, shows the satisfactory reversibility of structure.

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A cathode material based on the iron fluoride with an ultra-thin Li3FeF6 protective layer for high-capacity Li-ion batteries

Cited by 29 publications

References 32 publications

3D Starfish‐Like FeOF on Graphene Sheets: Engineered Synthesis and Lithium Storage Performance

3D Starfish‐Like FeOF on Graphene Sheets: Engineered Synthesis and Lithium Storage Performance

Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix

Hydrothermal synthesis of K3FeF6 and its electrochemical characterization as cathode material for lithium-ion batteries

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A cathode material based on the iron fluoride with an ultra-thin Li3FeF6 protective layer for high-capacity Li-ion batteries

Cited by 29 publications

References 32 publications

3D Starfish‐Like FeOF on Graphene Sheets: Engineered Synthesis and Lithium Storage Performance

3D Starfish‐Like FeOF on Graphene Sheets: Engineered Synthesis and Lithium Storage Performance

Improved Electrochemical Performance of FeF3 by Inlaying in a Nitrogen‐Doped Carbon Matrix

Hydrothermal synthesis of K3FeF6 and its electrochemical characterization as cathode material for lithium-ion batteries

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Improved Electrochemical Performance of FeF₃ by Inlaying in a Nitrogen‐Doped Carbon Matrix