Na3V2(PO4)3‐Supported Electrospun Carbon Nanofiber Nonwoven Fabric as Self‐Standing Na‐Ion Cell Cathode

Meligrana, Giuseppina; Ferrari, Stefania; Lucherini, Lorenzo; Cele, Jacopo; Colò, Francesca; Brugger, Juergen; Ricciardi, Carlo; Ruffο, Riccardo; Gerbaldi, Claudio

doi:10.1002/celc.202000345

Cited by 20 publications

(17 citation statements)

References 43 publications

(52 reference statements)

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“…NIB testing was performed at room temperature in a half-cell configuration by using sodium vanadium phosphate (Na 3 V 2 (PO 4 ) 3 ) (NVP) as the cathode. This cathode was selected because of its high Na + mobility and stable 3D host framework, 34 allowing larger specific capacities than other sodium ion-containing cathodes. 35 The cathode was obtained based on the approach developed by Feng et al, 36 where 80 wt % of Na 3 V 2 (PO 4 ) 3 was mixed with 10 wt % of Super P (conducting additive) and 10 wt % of PVDF binder in NMP.…”

Section: Methodsmentioning

confidence: 99%

Stable Na Electrodeposition Enabled by Agarose-Based Water-Soluble Sodium Ion Battery Separators

Ojanguren

Mittal

Lizundia

et al. 2021

ACS Appl. Mater. Interfaces

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Developing efficient energy storage technologies is at the core of current strategies toward a decarbonized society. Energy storage systems based on renewable, nontoxic, and degradable materials represent a circular economy approach to address the environmental pollution issues associated with conventional batteries, that is, resource depletion and inadequate disposal. Here we tap into that prospect using a marine biopolymer together with a water-soluble polymer to develop sodium ion battery (NIB) separators. Mesoporous membranes comprising agarose, an algae-derived polysaccharide, and poly(vinyl alcohol) are synthesized via nonsolvent-induced phase separation. Obtained membranes outperform conventional nondegradable NIB separators in terms of thermal stability, electrolyte wettability, and Na + conductivity. Thanks to the good interfacial adhesion with metallic Na promoted by the hydroxyl and ether functional groups of agarose, the separators enable a stable and homogeneous Na deposition with limited dendrite growth. As a result, membranes can operate at 200 μA cm –2 , in contrast with Celgard and glass microfiber, which short circuit at 50 and 100 μA cm –2 , respectively. When evaluated in Na 3 V 2 (PO 4 ) 3 /Na half-cells, agarose-based separators deliver 108 mA h g –1 after 50 cycles at C/10, together with a remarkable rate capability. This work opens up new possibilities for the use of water-degradable separators, reducing the environmental burdens arising from the uncontrolled accumulation of electronic waste in marine or land environments.

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Section: Methodsmentioning

confidence: 99%

Stable Na Electrodeposition Enabled by Agarose-Based Water-Soluble Sodium Ion Battery Separators

Ojanguren

Mittal

Lizundia

et al. 2021

ACS Appl. Mater. Interfaces

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“…Carbon nanofibers are used in a broad range of applications, including composites-in which they offer improved mechanical properties [1][2][3]; energy storage devices-in which their electrochemical properties play an important role [4][5][6]; and filter applications-where their chemical and morphological properties are decisive [7][8][9]. Usually, carbon nanofibers are prepared by electrospinning of polymers, such as poly(acrylonitrile) (PAN), from solution or melt, followed by oxidative stabilization and high-temperature carbonization [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Metallic Supports Accelerate Carbonization and Improve Morphological Stability of Polyacrylonitrile Nanofibers during Heat Treatment

et al. 2021

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Electrospun poly(acrylonitrile) (PAN) nanofibers are typical precursors of carbon nanofibers. During stabilization and carbonization, however, the morphology of pristine PAN nanofibers is not retained if the as-spun nanofiber mats are treated without an external mechanical force, since internal stress tends to relax, causing the whole mats to shrink significantly, while the individual fibers thicken and curl. Stretching the nanofiber mats during thermal treatment, in contrast, can result in fractures due to inhomogeneous stress. Previous studies have shown that stabilization and carbonization of PAN nanofibers electrospun on an aluminum substrate are efficient methods to retain the fiber mat dimensions without macroscopic cracks during heat treatment. In this work, we studied different procedures of mechanical fixation via metallic substrates during thermal treatment. The influence of the metallic substrate material as well as different methods of double-sided covering of the fibers, i.e. sandwiching, were investigated. The results revealed that sandwich configurations with double-sided metallic supports not only facilitate optimal preservation of the original fiber morphology but also significantly accelerate the carbonization process. It was found that unlike regularly carbonized nanofibers, the metal supports allow complete deoxygenation at low treatment temperature and that the obtained carbon nanofibers exhibit increased crystallinity.

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“…Polyacrylonitrile (PAN) is a common precursor for carbon, using macroscopic fibers or electrospun nanofibers [1,2]. Carbon nanofibers are typically used in composites due to their mechanical properties [3], but also as electrode material in energy storage devices [4] or super-capacitors [5] due to their electrical conductivity and high specific surface area. PAN can be electrospun from a polymer solution by the widely used needle-based technique or by diverse needle-less methods, such as drumor wire-based electrospinning.…”

Section: Introductionmentioning

confidence: 99%

Stabilization and Incipient Carbonization of Electrospun Polyacrylonitrile Nanofibers Fixated on Aluminum Substrates

Storck

Tuvshinbayar

Diestelhorst

et al. 2020

Fibers

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Polyacrylonitrile (PAN) nanofibers, prepared by electrospinning, are often used as a precursor for carbon nanofibers. The thermal carbonization process necessitates a preceding oxidative stabilization, which is usually performed thermally, i.e., by carefully heating the electrospun nanofibers in an oven. One of the typical problems occurring during this process is a strong deformation of the fiber morphologies—the fibers become thicker and shorter, and show partly undesired conglutinations. This problem can be solved by stretching the nanofiber mat during thermal treatment, which, on the other hand, can lead to breakage of the nanofiber mat. In a previous study, we have shown that the electrospinning of PAN on aluminum foils and the subsequent stabilization of this substrate is a simple method for retaining the fiber morphology without breaking the nanofiber mat. Here, we report on the impact of different aluminum foils on the physical and chemical properties of stabilized PAN nanofibers mats, and on the following incipient carbonization process at a temperature of max. 600 °C, i.e., below the melting temperature of aluminum.

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Na₃V₂(PO₄)₃‐Supported Electrospun Carbon Nanofiber Nonwoven Fabric as Self‐Standing Na‐Ion Cell Cathode

Cited by 20 publications

References 43 publications

Stable Na Electrodeposition Enabled by Agarose-Based Water-Soluble Sodium Ion Battery Separators

Stable Na Electrodeposition Enabled by Agarose-Based Water-Soluble Sodium Ion Battery Separators

Metallic Supports Accelerate Carbonization and Improve Morphological Stability of Polyacrylonitrile Nanofibers during Heat Treatment

Stabilization and Incipient Carbonization of Electrospun Polyacrylonitrile Nanofibers Fixated on Aluminum Substrates

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