Preparation and characterization of multi shape ZnO/PVDF composite materials

Weng, Ling; Ju, Peihai; Li, Hongxia; Yan, Liwen

doi:10.1007/s11595-017-1696-5

Cited by 13 publications

(10 citation statements)

References 8 publications

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“…It is postulated that the interface engineering approach is helpful for a breakthrough in long stable cycling capability and improves the efficiency of ion transport. [ 14,29 ] The previous reports indicate that the Na 2 S normally is formed when the voltage is discharged to lower than 1.2 V. [ 8,10,19 ] Combining these results with the in situ XRD and charge/discharge plateaus, we examined the electrochemical behavior of this electrode under selected cut‐off voltages corresponding to the active S conversion to the intermediate phases and then to the final product to prove the effective role of the Na 2 S interphase in improving the cycling and rate capabilities. Figure a shows the capacity retentions of MMPCS‐800@S electrodes after discharge to 1.5, 1.2, and 0.8 V at 0.5 A g −1 over 500 cycles, indicating the capacity retention ratios of ≈48%, ≈78%, and ≈90%, respectively.…”

Section: Resultsmentioning

confidence: 92%

Continuous Carbon Channels Enable Full Na‐Ion Accessibility for Superior Room‐Temperature Na–S Batteries

Lei

Simonelli

et al. 2022

Advanced Materials

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Porous carbon has been widely used as an efficient host to encapsulate highly active molecular sulfur (S) in Li–S and Na–S batteries. However, for these sub‐nanosized pores, it is a challenge to provide fully accessible sodium ions with unobstructed channels during cycling, particularly for high sulfur content. It is well recognized that solid interphase with full coverage over the designed architectures plays critical roles in promoting rapid charge transfer and stable conversion reactions in batteries, whereas constructing a high‐ionic‐conductivity solid interphase in the pores is very difficult. Herein, unique continuous carbonaceous pores are tailored, which can serve as multifunctional channels to encapsulate highly active S and provide fully accessible pathways for sodium ions. Solid sodium sulfide interphase layers are also realized in the channels, showing high Na‐ion conductivity toward stabilizing the redox kinetics of the S cathode during charge/discharge processes. This systematically designed carbon‐hosted sulfur cathode delivers superior cycling performance (420 mAh g−1 at 2 A g−1 after 2000 cycles), high capacity retention of ≈90% over 500 cycles at current density of 0.5 A g−1, and outstanding rate capability (470 mAh g−1 at 5 A g−1) for room‐temperature sodium–sulfur batteries.

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Section: Resultsmentioning

confidence: 92%

Continuous Carbon Channels Enable Full Na‐Ion Accessibility for Superior Room‐Temperature Na–S Batteries

Lei

Simonelli

et al. 2022

Advanced Materials

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“…The 840 cm −1 band, which relates to stretching of CF 2 and C-C bonds, corresponds to the β-phase. The 880 cm −1 band, which could be ascribed to the rocking of C-C skeleton vibration, corresponds to non-polar α-phase [56]. The content of α-phase and β-phase is usually determined by the area ratio of 840 cm −1 band and 880 cm −1 band.…”

Section: Nanofillersmentioning

confidence: 99%

Solution Blow Spinning of Polyvinylidene Fluoride Based Fibers for Energy Harvesting Applications: A Review

et al. 2020

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Polyvinylidene fluoride (PVDF)-based piezoelectric materials (PEMs) have found extensive applications in energy harvesting which are being extended consistently to diverse fields requiring strenuous service conditions. Hence, there is a pressing need to mass produce PVDF-based PEMs with the highest possible energy harvesting ability under a given set of conditions. To achieve high yield and efficiency, solution blow spinning (SBS) technique is attracting a lot of interest due to its operational simplicity and high throughput. SBS is arguably still in its infancy when the objective is to mass produce high efficiency PVDF-based PEMs. Therefore, a deeper understanding of the critical parameters regarding design and processing of SBS is essential. The key objective of this review is to critically analyze the key aspects of SBS to produce high efficiency PVDF-based PEMs. As piezoelectric properties of neat PVDF are not intrinsically much significant, various additives are commonly incorporated to enhance its piezoelectricity. Therefore, PVDF-based copolymers and nanocomposites are also included in this review. We discuss both theoretical and experimental results regarding SBS process parameters such as solvents, dissolution methods, feed rate, viscosity, air pressure and velocity, and nozzle design. Morphological features and mechanical properties of PVDF-based nanofibers were also discussed and important applications have been presented. For completeness, key findings from electrospinning were also included. At the end, some insights are given to better direct the efforts in the field of PVDF-based PEMs using SBS technique.

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“…22 It can greatly reduce the percolation threshold, and the flexibility and easy processing characteristics of polymers can be maintained. It is reported that zero-dimension zinc oxide (ZnO), one-dimensional carbon nanotube (CNT), and two-dimensional graphene nanosheet (GN) have been added into the polymer to achieve percolation transition at a lower fraction (ZnO-10 wt %, 23 CNT-1.6 vol % 20 and GN-2.5 wt % 24 ), with great enhancement of dielectric constant. However, the defects induced by the filled particles greatly reduced the breakdown strengths of these composites.…”

Section: Introductionmentioning

confidence: 99%

BaTiO₃/MWNTs/Polyvinylidene Fluoride Ternary Dielectric Composites with Excellent Dielectric Property, High Breakdown Strength, and High-Energy Storage Density

Zhao

Hou

et al. 2019

ACS Omega

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To improve the dielectric performance of polyvinylidene fluoride (PVDF), BaTiO 3 /MWNTs/PVDF ternary composites were prepared by the solution casting method. The percolation threshold (fraction of MWNTs) has dropped greatly below 0.4 vol %, with the enhancement of dielectric constant and breakdown field. For the BaTiO 3 /MWNTs/PVDF (11.5/0.35/88.15) composite, the dielectric constant is 59, the loss is below 0.055, and the maximum operating electric field is 324 MV/m, so the discharged energy density can be of up to 10.3 J/cm 3 with the efficiency of above 77.2%. The reason of improvement was revealed by the scanning electron microscope images and the X-ray diffraction data. It is found that uniform distribution of filler in the composites and the increase of the β phase of polymers result in the enhancement of polarization and improvement of dielectric constant of PVDF. The third-phase spherical inorganic particles prevent the formation of conductive networks and improve the uniformity of local electric field, so the breakdown strength of composites can be enhanced greatly. Here, this paper provides a method to get the composites with high energy storage density for supercapacitors.

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Preparation and characterization of multi shape ZnO/PVDF composite materials

Cited by 13 publications

References 8 publications

Continuous Carbon Channels Enable Full Na‐Ion Accessibility for Superior Room‐Temperature Na–S Batteries

Continuous Carbon Channels Enable Full Na‐Ion Accessibility for Superior Room‐Temperature Na–S Batteries

Solution Blow Spinning of Polyvinylidene Fluoride Based Fibers for Energy Harvesting Applications: A Review

BaTiO₃/MWNTs/Polyvinylidene Fluoride Ternary Dielectric Composites with Excellent Dielectric Property, High Breakdown Strength, and High-Energy Storage Density

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Preparation and characterization of multi shape ZnO/PVDF composite materials

Cited by 13 publications

References 8 publications

Continuous Carbon Channels Enable Full Na‐Ion Accessibility for Superior Room‐Temperature Na–S Batteries

Continuous Carbon Channels Enable Full Na‐Ion Accessibility for Superior Room‐Temperature Na–S Batteries

Solution Blow Spinning of Polyvinylidene Fluoride Based Fibers for Energy Harvesting Applications: A Review

BaTiO3/MWNTs/Polyvinylidene Fluoride Ternary Dielectric Composites with Excellent Dielectric Property, High Breakdown Strength, and High-Energy Storage Density

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Product

Resources

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BaTiO₃/MWNTs/Polyvinylidene Fluoride Ternary Dielectric Composites with Excellent Dielectric Property, High Breakdown Strength, and High-Energy Storage Density