Morphological Study of Gels Prepared from Poly(vinylidene fluoride) in Organic Solvents.

Tazaki, Michiko; Onodera, Akiko; Homma, Takeshi

doi:10.1295/koron.50.533

Cited by 6 publications

(4 citation statements)

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“…8 The structure and physical properties of PVdF gel have been studied by many workers. [9][10][11][12][13] The present authors investigated gelation process of PVdF homopolymer in many organic solvents from measurements of both time-resolved Fourier transform infrared (FT-IR) spectroscopy and dilatometry. [14][15][16][17] Tashiro et al studied the structural change during the gelation process and the resultant aggregation structure of PVdF polymer and solvent molecules in the gel through measurement of the time-resolved FT-IR.…”

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confidence: 99%

The Flory-Huggins Interaction Parameter and Thermoreversible Gelation of Poly(vinylidene fluoride) in Organic Solvents

Okabe

Wada

Tazaki

et al. 2003

Polym J

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ABSTRACT:The Flory-Huggins interaction parameter (χ 12 ) between poly(vinylidene fluoride) (PVdF) and organic solvent was estimated experimentally over wide range of temperature by an inverse gas chromatography (IGC) using many kinds of solvents such as alkane, alkene, ketone, lactone, and nitrogen-containing solvent. The thermoreversible gelation of PVdF solution was discussed from the magnitude of interaction parameter χ 12 between PVdF and solvent. The parameter χ 12 was measured for a concentrated PVdF solution by the usual IGC technique. The parameter χ 12 obtained for each PVdF/solvent system increased slowly with decreasing temperature. The present systems were divided broadly into three groups according to the magnitude of χ 12 in the vicinity of room temperature, i.e., group (a) with χ 12

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confidence: 99%

The Flory-Huggins Interaction Parameter and Thermoreversible Gelation of Poly(vinylidene fluoride) in Organic Solvents

Okabe

Wada

Tazaki

et al. 2003

Polym J

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“…Polyvinylidene Difluoride (PVDF)-based polymer gel electrolytes are known as physically cross-linked gels in which PVDF amorphous phase, including the electrolyte solution, is maintained inside the crystalline network, forming a swollen gel [ 39 , 40 , 41 ]. As the cross-links composed of the aggregated crystallites are weaker than the covalent cross-links as of poly(ethylene oxide) (PEO)-based gels, resulting in lower elasticity of the polymer network, the PVDF swollen gel is not adequate to retain the solution inside stably.…”

Section: Evaluation and Discussion Of Practical Materialsmentioning

confidence: 99%

Ion Transport in Solid Medium—Evaluation of Ionic Mobility for Design of Ion Transport Pathways in Separator and Gel Electrolyte

Saito

2021

Membranes

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Further improvement in the performance of lithium secondary batteries will be an indispensable issue to realize a decarbonized society. Among them, the batteries for electric vehicles still have many issues to be addressed because they are subject to various conditions such as high-power performance, safety, and cost restrictions for widespread use. Those subjects require extensive researches from the improvement of each element material to control the battery system to optimize the total performance. Based on this idea, we have been conducting research focusing on ion movement to elucidate the ion conduction mechanism from the microscopic point of view. It has been recognized that the ionic mobility in the battery, which dominates the power performance of the battery, is affected by the solid environment in which the ions move (separator and electrode materials) and the evaluation of ion movement, including the interaction with the surroundings, is necessary as an essential step for battery design. In this article, I will introduce the evaluation approach of ion dynamics and the evaluation results of mobility and interactive situations of carrier ions in the practical separator membranes and gel electrolytes. Finally, the direction of material design is outlined through this review.

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“…In contrast, poly(vinylidene difluoride) (PVDF) polymer gels without any specific polar groups on the chains are composed of a network of physically cross-linked PVDF crystallites . The solution phase and/or the amorphous phase, which captures the solution, is maintained inside the crystalline network, leading to a swollen gel. , Because the cross-links composed of the aggregated crystallites are weaker than the covalent cross-links, resulting in lower elasticity of the polymer network, the swollen structure of the PVDF gel is not stable enough to adequately retain the solution within its network.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Morphological Features of the Poly(vinylidene difluoride)-Based Gel Electrolytes on the Ionic Mobility for Lithium Secondary Batteries

Saito¹,

Takeda²,

Yamagami³

et al. 2019

Macromolecules

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Highly conductive solid electrolytes used in energy storage systems could be developed by the systematic control of the ion conduction mechanism in the solid medium. In this study, we evaluated the ion migration mechanism of poly(vinylidene difluoride) (PVDF) gel electrolytes in relation to the structural/morphological features of the physically cross-linked PVDF gels. By measuring the spin–spin relaxation times (T 2) of the cation/anion species of the quenched gel electrolytes, we found that anions with short T 2 were located close to the crystalline phase forming the cross-links, while cations with long T 2 were located in the solution-rich amorphous phase. The discrete locations of the cations and anions are suitable for preferential cation transport because the anions are restricted in the crystalline phase by the anion/crystallite interactions, as confirmed by the estimation of the microviscosity (βan). Enhancing the cation mobility by controlling the two-phase condition of the PVDF gel is a new and promising approach for obtaining electrolytes that can be applied in high-power batteries.

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Morphological Study of Gels Prepared from Poly(vinylidene fluoride) in Organic Solvents.

Cited by 6 publications

References 0 publications

The Flory-Huggins Interaction Parameter and Thermoreversible Gelation of Poly(vinylidene fluoride) in Organic Solvents

The Flory-Huggins Interaction Parameter and Thermoreversible Gelation of Poly(vinylidene fluoride) in Organic Solvents

Ion Transport in Solid Medium—Evaluation of Ionic Mobility for Design of Ion Transport Pathways in Separator and Gel Electrolyte

Effect of the Morphological Features of the Poly(vinylidene difluoride)-Based Gel Electrolytes on the Ionic Mobility for Lithium Secondary Batteries

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