Highly dispersed oleic-induced nanometric C@Na3V2(PO4)2F3 composites for efficient Na-ion batteries

García-Legaz, Ana María Criado; Lavela, Pedro; Ortiz, Gregório F.; Vicente, C.; Bahrou, N.; Edfouf, Zineb

doi:10.1016/j.electacta.2019.135502

Cited by 32 publications

(15 citation statements)

References 44 publications

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“…The peak value of V 3+ corresponds to the bonding energies of 517.3 and 523.8 eV. This was similar to the bonding energies of Mn 2+ and V 3+ reported in the previous literature [22,[29][30][31]. This showed that the introduction of NVPF has almost no effect on the valence of Mn 2+ in the final synthesized sample.…”

Section: Characterization Of Na 3 V 2 (Po 4 ) 2 F 3 /Na 2 Mnpo 4 F@c Compositesupporting

confidence: 88%

A composite cathode material for lithium-ion batteries: synthesis and electrochemical properties of xNa3V2(PO4)2F3·(1-x)Na2MnPO4F@C

Liu

et al. 2021

Ionics

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In order to improve the electrochemical properties of Na 2 MnPO 4 F (NMPF), low-cost biomass cane bagasse was used as a carbon source for coating, Na 3 V 2 (PO 4 ) 2 F 3 (NVPF) was used as a doped phase to prepare different ratios of xNa 3 V 2 (PO 4 ) 2 F 3 •(1-x) Na 2 MnPO 4 F@C (NVPF/NMPF@C) composite materials via a sol-gel method. The results including analysis of XRD, SEM, EDS, and XPS methods showed that NVPF/NMPF@C (x = 0.

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Section: Characterization Of Na 3 V 2 (Po 4 ) 2 F 3 /Na 2 Mnpo 4 F@c Compositesupporting

confidence: 88%

A composite cathode material for lithium-ion batteries: synthesis and electrochemical properties of xNa3V2(PO4)2F3·(1-x)Na2MnPO4F@C

Liu

et al. 2021

Ionics

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“…The presence of isolated vanadium bi‐octahedra in the structure induces a poor intrinsic electronic conductivity (∼10 −12 S cm −1 ) which strongly affects the high‐rate capacity retention [18] . To face this problem, the main approaches studied in the literature consist in combining NVPFO y with conductive carbon based material to synthesize composites or in decreasing particles size to facilitate the accessibility of electrolyte to the electrode surface and shorten ion and electron transport pathways [19–21] . For instance, dealing with this last approach, it was shown that nanosizing carbon coated‐NVPF by mechanical activation improves high rate capacity and cycling stability [22] .…”

Section: Introductionmentioning

confidence: 99%

Effect of the Particles Morphology on the Electrochemical Performance of Na₃V₂(PO₄)₂F_3‐yO_y

Fang

Olchowka

Pablos

et al. 2021

Batteries & Supercaps

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Among all the positive electrode materials explored for Na‐ion batteries, the family of Na3VIII2‐y(VIVO)y(PO4)2F3‐y (NVPFOy) has attracted extensive attention for its high operating voltage and structural stability. In order to promote better performance at high rates, it appears interesting to consider the correlation between NVPFOy’s composition, morphology (size and shape) and electrochemical properties. Here, solvothermal syntheses were considered in order to obtain a series of NVPFOy compounds showing different morphologies (such as nanospheres, flakes, cylindrical aggregates or desert‐roses) by playing on different synthesis parameters like water/ethanol ratio, stoichiometry of the precursors’ mixture, heating rate, and the presence or not of a surfactant. Four compounds presenting different morphology have been fully characterized by X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, infrared, NMR and XPS spectroscopies. Their electrochemical properties are studied using electrodes rich in active material in order to better observe the influence of the morphology on the energy storage performance and are compared to those of Na3V2(PO4)2F3 and Na3V2(PO4)2FO2 reference materials obtained by solid‐state synthesis and with shapeless morphology.

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“…It's worth noting that the energy density of the NVPO 2−x Cl x F//3DC@Se full cell could still achieve 314 Wh kg −1 as the power density increasing to 5850 W kg −1 , which is comparable to the NVPF‐based full devices previously reported (Figure 6d). [ 6d,11–12,15b,22 ] The cyclic property of this full cell was also examined under various current densities. A considerable initial capacity of ≈118 mAh g −1 is obtained at 1C (Figure 6e).…”

Section: Resultsmentioning

confidence: 99%

Localized Electron Density Redistribution in Fluorophosphate Cathode: Dangling Anion Regulation and Enhanced Na‐Ion Diffusivity for Sodium‐Ion Batteries

Wang

Kang

et al. 2021

Adv Funct Materials

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Polyanionic transition metal polyphosphate (TMPO)-type Na 3 V 2 (PO 4 ) 2 O 2 F (NVPO 2 F) is promising as cathode for large-scale sodium-ion batteries (SIBs) on account of its considerable capacity and highly stable structure. However, the redox of transition metal and phase transitions along with the (de) intercalation of Na + lead to its slow kinetics and inferior rate performance. Herein, chlorine (Cl) is applied as a heteropical dopant to obtain Cl-doped NVPO 2 F (NVPO 2−x Cl x F) cathode material for SIBs. Density functional theory investigation reveals that Cl doping tunes the localized electronic density and structure in NVPO 2 F lattice, causing the electron redistribution on vanadium center and dangling anions. Hence, the NVPO 2−x Cl x F cathode exhibits a revised redox behavior of vanadium for Na + extraction/insertion, increases Na + diffusion rate, as well as lowers charge transfer resistance. A Na + storage mechanism of reversible transformations between three phases and V 4+ /V 5+ redox couple for NVPO 2−x Cl x F cathode is verified. The NVPO 2−x Cl x F cathode reveals a high rate capacity of ≈63 mAh g −1 at 30C and great cycle stability over 1000 cycles at 10C. More importantly, outstanding rate property (314 Wh kg −1 at 5850 W kg −1 ) and cycling capability are obtained for the NVPO 2−x Cl x F//3DC@Se full cell. This study demonstrates a brand-new strategy to prepare advanced cathode materials for superior SIBs.

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Highly dispersed oleic-induced nanometric C@Na3V2(PO4)2F3 composites for efficient Na-ion batteries

Cited by 32 publications

References 44 publications

A composite cathode material for lithium-ion batteries: synthesis and electrochemical properties of xNa3V2(PO4)2F3·(1-x)Na2MnPO4F@C

A composite cathode material for lithium-ion batteries: synthesis and electrochemical properties of xNa3V2(PO4)2F3·(1-x)Na2MnPO4F@C

Effect of the Particles Morphology on the Electrochemical Performance of Na₃V₂(PO₄)₂F_3‐yO_y

Localized Electron Density Redistribution in Fluorophosphate Cathode: Dangling Anion Regulation and Enhanced Na‐Ion Diffusivity for Sodium‐Ion Batteries

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Highly dispersed oleic-induced nanometric C@Na3V2(PO4)2F3 composites for efficient Na-ion batteries

Cited by 32 publications

References 44 publications

A composite cathode material for lithium-ion batteries: synthesis and electrochemical properties of xNa3V2(PO4)2F3·(1-x)Na2MnPO4F@C

A composite cathode material for lithium-ion batteries: synthesis and electrochemical properties of xNa3V2(PO4)2F3·(1-x)Na2MnPO4F@C

Effect of the Particles Morphology on the Electrochemical Performance of Na3V2(PO4)2F3‐yOy

Localized Electron Density Redistribution in Fluorophosphate Cathode: Dangling Anion Regulation and Enhanced Na‐Ion Diffusivity for Sodium‐Ion Batteries

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Effect of the Particles Morphology on the Electrochemical Performance of Na₃V₂(PO₄)₂F_3‐yO_y