Electrical characteristics of fluorinated carbon black‐filled poly(vinylidene fluoride) composites

Wu, Guozhang; Zhang, Cheng; Miura, Tadashi; Asai, Shigeo; Sumita, Masao

doi:10.1002/app.1191

Cited by 27 publications

(14 citation statements)

References 15 publications

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“…Composites of fluorinated CB with poly (vinylidene fluoride) (PVDF) have been prepared and their conductivity and dielectric behavior studied [68].…”

Section: Conductive Inorganic Particles/insulating Polymersmentioning

confidence: 99%

Electronically conductive polymers

Jagur‐Grodzinski

2002

Polymers for Advanced Techs

130

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“…Composites of fluorinated CB with poly (vinylidene fluoride) (PVDF) have been prepared and their conductivity and dielectric behavior studied [68].…”

Section: Conductive Inorganic Particles/insulating Polymersmentioning

confidence: 99%

Electronically conductive polymers

Jagur‐Grodzinski

2002

Polymers for Advanced Techs

130

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“…In general, the dispersion of the conductive particles in the polymer matrix can be determined by competing between the particle-particle and particle-polymer interactions. 33,34 The CB has a greater surface area to contact with the polymer matrix because of the physical or chemical interaction between the CB particles and polymer matrix. 35 The polymer PTC materials containing the ionomer have a unique physical crosslinking structure due to the ionomer in the polymer matrix, which was attributed to the ionic bond formed between metallic ions and acid groups of the polymer.…”

Section: Resultsmentioning

confidence: 99%

PTC behavior of polymer composites containing ionomers upon electron beam irradiation

Kim¹,

Cho

Kim

et al. 2004

Macromol. Res.

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We have prepared polymer composites of low-density polyethylene (LDPE) and ionomers (Surlyn 8940) containing polar segments and metal ions by melt blending with carbon black (CB) as a conductive filler. The resistivity and positive temperature coefficient (PTC) of the ionomer/LDPE/CB composites were investigated with respect to the CB content. The ionomer content has an effect on the resistivity and percolation threshold of the polymer composites; the percolation curve exhibits a plateau at low CB content. The PTC intensity of the crosslinked ionomer/LDPE/CB composite decreased slightly at low ionomer content, and increased significantly above a critical concentration of the ionomer. Irradiation-induced crosslinking could increase the PTC intensity and decrease the NTC effect of the polymer composites. The minimum switching current (I trip ) of the polymer composites decreased with temperature; the ratio of I trip for the ionomer/LDPE/CB composite decreased to a greater extent than that of the LDPE/CB composite. The average temperature coefficient of resistance (α T ) for the polymer composites increased in the low-temperature region.

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“…All the samples also contain darker, highly-textured regions which are the carbon black additive and polymer binder. 51 Considering the optical images and XRD spectra (Fig. 5), as the [SDS] is above the cmc during processing of P-6.5 and M-6.5, the brighter structures observed in the corresponding SEM images are likely aggregates of TiO 2 particles that were nucleated by bulk micelles as well as embedded FGS-TiO 2 nanocomposites in which TiO 2 was templated on the FGSs by surface micelles through the self-assembly process described by Wang et al 27 For the M-0.65 sample, as [SDS] was slightly below the cmc during processing and thus only surface micelles were present in the system, 37 the brighter structures observed in the corresponding SEM image are likely compact agglomerates of FGS-TiO 2 in which the TiO 2 was templated on FGSs by surface micelles again by the self-assembly process.…”

Section: Characterization Of Fgs-tiomentioning

confidence: 99%

High-Rate Li⁺Storage Capacity of Surfactant-Templated Graphene-TiO₂Nanocomposites

Hsieh

Punckt

Aksay

2015

J. Electrochem. Soc.

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Graphene-TiO 2 nanocomposites are a promising anode material for Li-ion batteries due to their good high-rate capacity, inherent safety, and mechanical and chemical robustness. However, despite a large number of scientific reports on the material, the mechanism of the enhanced high-rate Li + storage capacity that results from the addition of graphene to TiO 2 -typically attributed to improved electrical conductivity -is still not well understood. In this work, we focus on optimizing the processing of surfactant-templated graphene-TiO 2 hybrid nanocomposites. Towards this end, we examine the influence of various processing parameters, in particular the surfactant-mediated colloidal dispersion of graphene, on the material properties and electrochemical performance of grapheneTiO 2 . We investigate the influence of electrode mass loading on Li + storage capacity, focusing mainly on high-rate performance. Furthermore, we demonstrate an approach for estimating power loss during charge/discharge cycling, which offers a succinct method for characterizing the high-rate performance of Li-ion battery electrodes. Metal oxides have been studied extensively as anode materials for Li-ion batteries due to their comparably high Li-insertion/extraction potentials, 1,2 which make them inherently safe from Li-electroplating and dendrite formation, thus preventing membrane perforation and cell shorting even at high lithiation currents. Additionally, good mechanical and chemical stability during operation enables long cycling lifetimes.2-4 However, large oxide particles are restricted to slow charge/discharge rates (< C/5, meaning charge/discharge times > 5 h) because of low diffusion rates of Li +5-8 and poor electrical conductivity in oxides. Much work has therefore been done to address these limitations, with significant attention placed on titanium dioxide (TiO 2 ) 9-12 because it is abundant and chemically inert, and the availability of simple processes for producing nanostructured (i.e., nano-sized or nano-porous) TiO 2 make it attractive for large-scale use.Nanostructuring of TiO 2 improves Li + transport mainly by decreasing the length of Li + diffusion pathways through the oxide during lithiation/delithiation. 8,[13][14][15] In addition, the diffusivity of Li + in TiO 2 can be enhanced by using surfactant templates to orient the growth of the oxide. [16][17][18] To improve electron transport in TiO 2 electrodes, on the other hand, conductive coatings [19][20][21][22] at [SDS] just below the cmc, however, micelles will only be present on FGSs. 37 As such, the [SDS] used in the processing of FGS-TiO 2 will strongly influence where TiO 2 growth occurs and how intimately interconnected FGSs and TiO 2 will be, which will significantly affect the Li + storage performance of the nanocomposites. Furthermore, as the practical energy density of the system depends, in part, on the fraction of active mass present, 38 it is also necessary to investigate the effect of electrode mass loading, i.e., the amount of active material per unit ...

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Electrical characteristics of fluorinated carbon black‐filled poly(vinylidene fluoride) composites

Cited by 27 publications

References 15 publications

Electronically conductive polymers

Electronically conductive polymers

PTC behavior of polymer composites containing ionomers upon electron beam irradiation

High-Rate Li⁺Storage Capacity of Surfactant-Templated Graphene-TiO₂Nanocomposites

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Electrical characteristics of fluorinated carbon black‐filled poly(vinylidene fluoride) composites

Cited by 27 publications

References 15 publications

Electronically conductive polymers

Electronically conductive polymers

PTC behavior of polymer composites containing ionomers upon electron beam irradiation

High-Rate Li+Storage Capacity of Surfactant-Templated Graphene-TiO2Nanocomposites

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Product

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High-Rate Li⁺Storage Capacity of Surfactant-Templated Graphene-TiO₂Nanocomposites