Iron-based fluorides of tetragonal tungsten bronze structure as potential cathodes for Na-ion batteries

Han, Yanlin; Hu, Jiulin; Yin, Congling; Zhang, Ye; Xie, Junjie; Yin, Daqiang; Li, Chilin

doi:10.1039/c6ta02061e

Cited by 62 publications

(42 citation statements)

References 45 publications

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“…The XRD result of as prepared GCF is presented in Figure b. All the peaks can be attributed to the standard hexagonal‐bronze‐tungsten FeF 3 ⋅ 0.33 H 2 O . The XRD results of FeF 3 ⋅ 3 H 2 O after fluorination are presented in Figure S1.…”

Section: Resultsmentioning

confidence: 99%

“…All the peaks can be attributed to the standard hexagonal-bronzetungsten FeF 3 · 0.33 H 2 O. [23][24][25][26] The XRD results of FeF 3 · 3 H 2 O after fluorination are presented in Figure S1. In order to determine the amount of porous carbon formed after carbonization of MIL-53, thermogravimetric analysis (TGA) of GCF ( Figure S2) was carried out.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasmall Iron Fluoride Nanoparticles Embedded in Graphitized Porous Carbon Derived from Fe‐Based Metal Organic Frameworks as High‐Performance Cathode Materials for Li Batteries

et al. 2019

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Iron‐based metal organic framework (MOF) MIL‐53 is used as a precursor and self‐template to synthesize a 3D porous carbon/FeF3 ⋅ 0.33 H2O composite in situ. We find that the organic ligands in iron‐containing MOFs can convert into highly graphitized carbon with the catalysis of central Fe atoms. The FeF3 ⋅ 0.33 H2O nanoparticles formed after fluorination and dehydration are surrounded by highly graphitized carbon. In the composite, the graphitized 3D porous carbon can provide passageways for electron transport and ultrasmall FeF3 ⋅ 0.33 H2O nanoparticles facilitate the diffusion of Li ions. The composite shows excellent performance for the Li storage. A capacity of 86 mAh g−1 can be reached at an ultra‐high rate of 20 C. Even after 300 charge−discharge cycles at 5 C, the capacity remains at 113 mAh g−1.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasmall Iron Fluoride Nanoparticles Embedded in Graphitized Porous Carbon Derived from Fe‐Based Metal Organic Frameworks as High‐Performance Cathode Materials for Li Batteries

et al. 2019

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“…Changing the linkage manner of ligands has been proven to be effective in constructing more spacious migration channels of potentially more dimensionality, as shown in Na 4 Fe 3 (PO 4 ) 2 (P 2 O 7 ), by introducing P 2 O 7 pillars into framework (with solid solution behavior of small volume change <4%) . One should note that even the one‐phase behavior still would result in lattice distortion to a certain degree, unless the electrode is of zero‐strain …”

Section: Introductionmentioning

confidence: 99%

“…K + can be expected as an alternative filler with desired positive charge. Its large ion size (with a radius of 1.4 Å) can maintain the open framework phase such as bronze phase, but the tetragonal tungsten bronze (TTB; K 0.6 FeF 3 ) phase instead of the hydrated hexagonal tungsten bronze (FeF 3 •0.33H 2 O) phase . The former, which is characterized by stackings of pentagonal and tetragonal cavities, is more robust than the latter, which has exclusive hexagonal tunnels and is enabled by facile solid‐state synthesis.…”

Section: Introductionmentioning

confidence: 99%

Cubic Perovskite Fluoride as Open Framework Cathode for Na‐Ion Batteries

Cao

Yin

Shi

et al. 2017

Adv Funct Materials

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Exploring novel structure prototype and mineral phase, especially open framework material, is crucial to developing high-performance Na-ion battery cathodes in view of potentially faster intrinsic diffusion of Na + in lattices. Perovskite phases have been widely applied in solar cells, fuel cells, and electrocatalysis; however, they are rarely attempted as energy storage electrode materials. This study proposes pre-expanding perovskite iron fluoride (KFeF 3 ) framework by stuffing large-sized K + as a channel filler, which is advantageous over Na + , NH 4 + , and H 2 O molecule filler in terms of structure robustness, symmetry, and connectivity. K + stuffing leads to the preservation of a more "regular" cubic phase with fast isotropic 3D diffusion as a consequence of no distortion of FeF 6 octahedra during K-Na electrochemical exchange and following Na-insertion cycling. High-rate Na-storage is achievable with a reversible capacity of 110, 70, and 40 mAh g −1 at 0.1, 2, and 10 C, respectively, for this open framework fluoride cathode, benefiting from solid solution electrochemical behavior and high intrinsic diffusion coefficient. It is thought that this rate performance is currently the best among Na-storage fluoride materials.

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“…Sodium ion batteries (SIBs) have aroused considerable attention owing to the same high energy density as LIBs, abundant sodium resource, low price and appropriate redox potential for battery applications (E Na + /Na = −2.71 V only 0.3 V above that of lithium). [3][4][5] In addition, sodium, as the second lightest and smallest alkali metal next to lithium, is similar to lithium in physical and chemical properties. Therefore, there is no doubt that SIBs will occupie a major position in the energy storage system in the future.…”

mentioning

confidence: 99%

Iron Fluoride Packaged into 3D Order Mesoporous Carbons as High-Performance Sodium-Ion Battery Cathode Material

Zhang

Wang

et al. 2018

J. Electrochem. Soc.

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The FeF 3 · 0.33H 2 O nanoparticles packaged into three-dimensional order mesoporous carbons (3D-OMCs) as cathode material of sodium-ion batteries (SIBs) was deliberately designed and fabricated by a facile nanocasting technique and mesoporous silica KIT-6 template. The structure, morphology, elemental distribution and electrochemical performance of FeF 3 · 0.33H 2 O@3D-OMCs nanocomposite are investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscope (TEM), energy-dispersive X-ray spectroscope (EDS), Raman spectroscopy and electrochemical measurement. The results show that the as-synthesized FeF 3 · 0.33H 2 O nanoparticles are perfectly packaged in 3D-OMCs matrix, and the size and morphology of FeF 3 · 0.33H 2 O nanoparticles can be effectively controlled. Furthermore, it has been found that the FeF 3 · 0.33H 2 O@3D-OMCs nanocomposite can deliver a high first discharge capacity of 386 mAh g −1 and excellent capacity reservation after 100 cycles at a rate of 20 mA g −1 in the voltage range of 1.0-4.0 V. Especially, even up to 100 mA g −1 , the discharge capacity is still as high as 201 mAh g −1 , indicating a remarkable rate capability. The excellent electrochemical properties of FeF 3 · 0.33H 2 O@3D-OMCs nanocomposite can be because the 3D mesoporous structure of 3D-OMCs can provide an expressway of electron transfer for Na + insertion/extraction, and alleviate the drastic volume variation of FeF 3 · 0. In recently years, lithium-ion batteries (LIBs) have been generally used as an effective energy storage approach in the consumer electronics and electric vehicles (EVs) because of their high energy density, long cycle life and environmentally friendly.1,2 However, the limited resource and high price of lithium salts restrict its further application and development, thus seeking alternative new energy materials have become a hot topic of concern and research. Sodium ion batteries (SIBs) have aroused considerable attention owing to the same high energy density as LIBs, abundant sodium resource, low price and appropriate redox potential for battery applications (E Na + /Na = −2.71 V only 0.3 V above that of lithium). [3][4][5] In addition, sodium, as the second lightest and smallest alkali metal next to lithium, is similar to lithium in physical and chemical properties.

show abstract

Iron-based fluorides of tetragonal tungsten bronze structure as potential cathodes for Na-ion batteries

Cited by 62 publications

References 45 publications

Ultrasmall Iron Fluoride Nanoparticles Embedded in Graphitized Porous Carbon Derived from Fe‐Based Metal Organic Frameworks as High‐Performance Cathode Materials for Li Batteries

Ultrasmall Iron Fluoride Nanoparticles Embedded in Graphitized Porous Carbon Derived from Fe‐Based Metal Organic Frameworks as High‐Performance Cathode Materials for Li Batteries

Cubic Perovskite Fluoride as Open Framework Cathode for Na‐Ion Batteries

Iron Fluoride Packaged into 3D Order Mesoporous Carbons as High-Performance Sodium-Ion Battery Cathode Material

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