Quantification of the solvent evaporation rate during the production of three PVDF crystalline structure types by solvent casting

Horibe, Hideo; Sasaki, Yasutaka; Oshiro, Hironori; Hosokawa, Yukari; Kono, Akihiko; Takahashi, Satoshi; Nishiyama, Takashi

doi:10.1038/pj.2013.75

Cited by 45 publications

(20 citation statements)

References 17 publications

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“…The DS-LTO electrode resulting from HP times longer than 30 min, exhibits an enhanced melting degree and dispersibility, which results in excellent mechanical strength and electrical conduction. However, at HP times above 90 min, the PVDF shrinks again via recrystallization, and the previously dispersed PVDF is re-agglomerated in the electrode; the temperature, time, and pressure dependence of the properties of the PVDF has been shown in several studies [30][31][32]. The distribution of the binder polymer in accordance with the HP time can be confirmed through the cross-sectional SEM image of the dry-sprayed electrode, and the surface morphology of PVdF powder shows obvious changes corresponding to HP time ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Novel solvent-free direct coating process for battery electrodes and their electrochemical performance

Park

Cañas

Wagner

et al. 2016

Journal of Power Sources

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We report a novel solvent-free direct coating process for fabricating a well-structured electrode. The manufacturing process was rapid and facile, involving only dry-spraying of the solvent-free electrode component mixture and a subsequent isothermal hot-pressing. The electrochemical and physicochemical properties of the dry-sprayed electrode with hotpressing were evaluated in order to understand the correlation between a preparation parameter, morphological characteristic of the electrode, and cell performance. The hotpressing time had an effect on the binder distribution, which in turn resulted in different electrode morphologies and performance. The dry-sprayed LTO electrode prepared at a hotpressing time of 60 min had excellent electrical conductivity and Li + storage capacity, owing to its electron transport structure, which was more suitable than the prepared electrodes at other hot-pressing conditions.

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Section: Resultsmentioning

confidence: 99%

Novel solvent-free direct coating process for battery electrodes and their electrochemical performance

Park

Cañas

Wagner

et al. 2016

Journal of Power Sources

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“…However, due to the low piezoelectric coefficient, pristine casted PVDF has a low content of β-phase [ 49 , 50 , 51 , 52 ]. Horibe et al, in their work, established that the crystalline structure of the PVDF resulting from solvent casting is predominantly determined by the solvent evaporation rate [ 53 ]. Other methods such as tape casting, hot pressing, template, and phase separation were also intensively investigated.…”

Section: Piezoelectric Pvdfmentioning

confidence: 99%

A Review of Piezoelectric PVDF Film by Electrospinning and Its Applications

Kalimuldina

Turdakyn

Abay

et al. 2020

Sensors

258

124

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With the increase of interest in the application of piezoelectric polyvinylidene fluoride (PVDF) in nanogenerators (NGs), sensors, and microdevices, the most efficient and suitable methods of their synthesis are being pursued. Electrospinning is an effective method to prepare higher content β-phase PVDF nanofiber films without additional high voltage poling or mechanical stretching, and thus, it is considered an economically viable and relatively simple method. This work discusses the parameters affecting the preparation of the desired phase of the PVDF film with a higher electrical output. The design and selection of optimum preparation conditions such as solution concentration, solvents, the molecular weight of PVDF, and others lead to electrical properties and performance enhancement in the NG, sensor, and other applications. Additionally, the effect of the nanoparticle additives that showed efficient improvements in the PVDF films was discussed as well. For instance, additives of BaTiO3, carbon nanotubes, graphene, nanoclays, and others are summarized to show their contributions to the higher piezo response in the electrospun PVDF. The recently reported applications of electrospun PVDF films are also analyzed in this review paper.

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“…Then, the evaporation rate in PVDF solutions prepared utilizing HMPA, DMAc and acetone as solvents was altered by controlling the evaporation conditions and quantified by measuring the sample weight alteration with the solvent evaporation time. 14) As a result, the crystalline structures of the PVDF , , and  phases were formed with evaporation rates of less than 0.0001 g/min, more than 0.2 g/min, and between 0.03 and 0.00058 g/min, respectively.…”

Section: Introductionmentioning

confidence: 97%

Effect of solvents on the crystal formation of poly(vinylidene fluoride) film prepared by a spin-coating process

Nishiyama

Sumihara

Sato

et al. 2016

Polym J

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The effect of the solvent evaporation rate and solvent type on the crystal formation of poly(vinylidene fluoride) (PVDF) prepared by spin-coating was evaluated over time. In the much-solvent-remaining state, the crystalline phase of PVDF changed in the order of , , and  with the increasing dipole moment of the solvent. In the almost-all-solvent-evaporated state, the crystalline structure of PVDF/hexamethylphosphoramide with a higher dipole moment was dominantly dependent on the evaporation rate and varied in the order of ,  and  with the increasing solvent evaporation rate. However, PVDF/triethyl phosphate, having a lower dipole moment, always formed the  phase, regardless of the evaporation rate. The PVDF  phase in the concentrated solution state is difficult to transform into the  and  phases because the potential energy of each PVDF crystalline phase increases in the order of , , and . The PVDF crystalline phase in the spin-coating method is strongly affected by both the polymer-solvent electrostatic interactions and the evaporation conditions. From the results of the crystal transition behavior, it was experimentally supported that the potential energy of the PVDF crystalline structure increases in the order of , , and .

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Quantification of the solvent evaporation rate during the production of three PVDF crystalline structure types by solvent casting

Cited by 45 publications

References 17 publications

Novel solvent-free direct coating process for battery electrodes and their electrochemical performance

Novel solvent-free direct coating process for battery electrodes and their electrochemical performance

A Review of Piezoelectric PVDF Film by Electrospinning and Its Applications

Effect of solvents on the crystal formation of poly(vinylidene fluoride) film prepared by a spin-coating process

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