Carbon Metal Fluoride Nanocomposites

Badway, F.; Cosandey, F.; Pereira, Nathalie; Amatucci, Glenn G.

doi:10.1149/1.1602454

Cited by 441 publications

(417 citation statements)

References 14 publications

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“…A new positive electrode material with large capacity is needed for these devices, because current positive electrode materials utilize insertion reactions with intrinsically limited capacities based on one-(or less) electron reaction per formula unit (140 mAh g −1 for LiCoO 2 (0.5 Li) [4,5] and 170 mAh g −1 for LiFePO 4 (1 Li) [6]). Thus, instead of such insertion materials, iron(III) fluoride (FeF 3 ) has been receiving attention as a positive electrode material with a high theoretical capacity of 712 mAh g −1 based on the three-electron reaction, reasonably high average operating potential of 2.7 V vs. Li + /Li, in addition to abundant resources of iron [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Iron(III) fluoride synthesized by a fluorolysis method and its electrochemical properties as a positive electrode material for lithium secondary batteries

Tawa

Yamamoto

Matsumoto

et al. 2016

Journal of Fluorine Chemistry

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Iron(III) fluoride (FeF 3 ) with low crystallinity and high surface area has been synthesized by a fluorolysis method, and applied as a positive electrode material for lithium secondary batteries. The FeF 3 prepared with a high molar ratio of hydrogen fluoride exhibits a high surface area and crystallinity. The FeF 3 sample treated at 300 °C under a F 2 /Ar atmosphere exhibits the highest surface area and was selected for further electrochemical test in view of improvement of performance in the potential region of conversion reactions. The initial discharge (lithiation) capacity was 676 mAh g −1 that was close to the theoretical capacity of FeF 3 (712 mAh g −1 ).Compared to the highly crystalline FeF 3 commercially available, the synthesized FeF 3 in the present study exhibited a low discharge capacity attributed to the insertion reaction because of the low crystallinity, and showed a low overpotential and larger capacity corresponding to the conversion reaction owing to the higher surface area of the fluorides.

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Section: Introductionmentioning

confidence: 99%

“…This insulating problem was improved by ball-milling with carbon materials and, in some reports, high reversible capacities of ca. 600 mAh g −1 were attained according to the two consecutive reactions [8,9]; FeF 3 + Li + + e − ⇄ LiFeF 3 (1)…”

Section: Introductionmentioning

confidence: 99%

Iron(III) fluoride synthesized by a fluorolysis method and its electrochemical properties as a positive electrode material for lithium secondary batteries

Tawa

Yamamoto

Matsumoto

et al. 2016

Journal of Fluorine Chemistry

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“…5 Such attributes could potentially lead to FeF2 cathodes displaying considerably higher energy densities compared to their 10 intercalation analogues. The potentially high energy density may, however, be somewhat restrained as FeF2 exhibits known Mottinsulator properties.…”

Section: Introductionmentioning

confidence: 99%

Supercritical-fluid synthesis of FeF2 and CoF2 Li-ion conversion materials

et al. 2013

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The synthesis of the Li-ion conversion candidates, FeF2 and CoF2, obtained from the single source organometallic precursors [Fe(tta)3] (tta = C8H4F3O2S), and [Co(hfac)2[middle dot]2H2O] (hfac = C5H1F6O2), respectively, via a novel supercritical fluid (SCF) method is presented. The nature of the synthesis led to highly-crystalline FeF2 and CoF2 powders requiring no additional thermal treatment. The as-obtained powders were investigated for use as potential positive Li-ion conversion electrodes by means of chronopotentiometric measurements. The FeF2 cells displayed high initial capacities following electrochemical conversion (up to [similar]1100 mA h g-1 at a potential of 1.0 V vs. Li/Li+), with appreciable cyclic behaviour over 25 discharge-charge cycles. The deposition of a [similar]5 nm layer of amorphous carbon onto the surface of the active material following SCF treatment, likely facilitated adequate electron transport through an otherwise poorly conducting FeF2 phase. Similarly, CoF2 cells displayed high initial capacities (up to [similar]650 mA h g-1 at a potential of 1.2 V vs. Li/Li+), although significant capacity fading ensued in the subsequent cycles. Ex situ XRD measurements confirmed a poor reversibility in the conversion sequence for CoF2, with a complete loss of CoF2 crystallinity and the sole presence of a crystalline LiF phase following charging

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“…[23][24][25] It is generally attributable to the volumetric variations of the active material upon cycling (lithium input and output), leading to a partial loss of contact with the conductive additive, creating isolated particles of active materials which cannot contribute to the electrochemical reactions. Similar considerations can be made for FIBs.…”

Section: Electrochemical Testingmentioning

confidence: 99%

Modified coin cells to evaluate the electrochemical properties of solid-state fluoride-ion batteries at 150 °C

Grenier

Gutierrez

Groult

et al. 2016

Journal of Fluorine Chemistry

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. Modified coin cells to evaluate the electrochemical properties of solid-state fluoride-ion batteries at 150°C. Journal of Fluorine Chemistry, Elsevier, 2016, 191, pp.23 -28. 10 AbstractIn the scope of developing new chemistries for electrochemical energy systems, rechargeable solid-state fluoride-ion batteries are attractive devices owing to their high theoretical energy density. State of the art of fluoride ion conductors require the use of high temperature electrochemical cells to overcome the low ionic conductivity of the electrolyte at room temperature. In this work, we modify a coin cell to evaluate the electrochemical properties of fluoride-ion batteries at elevated temperature, over long periods of time and outside a glovebox.The coin cell is covered by a high-temperature epoxy resin that enables efficient sealing and therefore protection against air atmosphere at 150 °C. The suitability of the setup is confirmed by electrochemical investigation performed on a symmetrical cell assembled with composite electrodes made of Bi and BiF3. Notably, a reversible capacity of around 190 mAh/g after 3 cycles is reached with the modified coin cell setup.2

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Carbon Metal Fluoride Nanocomposites

Cited by 441 publications

References 14 publications

Iron(III) fluoride synthesized by a fluorolysis method and its electrochemical properties as a positive electrode material for lithium secondary batteries

Iron(III) fluoride synthesized by a fluorolysis method and its electrochemical properties as a positive electrode material for lithium secondary batteries

Supercritical-fluid synthesis of FeF2 and CoF2 Li-ion conversion materials

Modified coin cells to evaluate the electrochemical properties of solid-state fluoride-ion batteries at 150 °C

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