Improved battery performance contributed by the optimized phase ratio of β and α of PVDF

Ren, Yongmao; Wang, Ying; Zhang, Wenlong; Yan, Xiao; Huang, Bixiong

doi:10.1039/c9ra04724g

Cited by 17 publications

(13 citation statements)

References 40 publications

(42 reference statements)

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“…The characteristics of PVDF β-phase absorption bands observed at 604 cm −1 and 1249 cm −1 are the fingerprint of the β-phase of the PVDF 48 . The various absorption bands that appeared at 501 cm −1 , 1077 cm −1 , 1160 cm −1 , and 1388 cm −1 are the characteristic peaks of the absorption band of the α crystalline phase of PVDF 49 . The PVDF is a fluoro compound, and it has shown strong absorbance in that region, which was evident from the FTIR of the pristine PVDF (Fig.…”

Section: Resultsmentioning

confidence: 96%

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Synthesis of a biomimetic zwitterionic pentapolymer to fabricate high-performance PVDF membranes for efficient separation of oil-in-water nano-emulsions

Baig

Arshad

Ali

2022

Sci Rep

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Oily wastewater from industries has an adverse impact on the environment, human and aquatic life. Poly(vinylidene fluoride) (PVDF) membrane modified with a zwitterionic/hydrophobic pentapolymer (PP) with controlled pore size has been utilized to separate oil from water from their nano-emulsions. The PP has been synthesized in 91% yield via pentapolymerization of four different diallylamine salts [(CH2=CHCH2)2NH+(CH2)x A−], bearing CO2−, PO3H−, SO3−, (CH2)12NH2 pendants, and SO2 in a respective mol ratio of 25:36:25:14:100. Incorporating PP into PVDF has shown a substantially reduced membrane hydrophobicity; the contact angle decreased from 92.5° to 47.4°. The PP-PVDF membranes have demonstrated an excellent capability to deal with the high concentrations of nano-emulsions with a separation efficiency of greater than 97.5%. The flux recovery ratio (FRR) of PP-5 incorporated PVDF membrane was about 82%, which was substantially higher than the pristine PVDF.

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Section: Resultsmentioning

confidence: 96%

“…3 A). Due to the –C–H's symmetric stretching, the absorption band was observed at 2887 cm −1 , whereas the asymmetric stretching was assigned to the absorption band at 2977 cm −1 49 . In the case of the PP 5 -containing membranes such as M-1 to M-3 , all the characteristic peaks of the PVDF membranes have been observed (Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of a biomimetic zwitterionic pentapolymer to fabricate high-performance PVDF membranes for efficient separation of oil-in-water nano-emulsions

Baig

Arshad

Ali

2022

Sci Rep

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“…The peaks at 20.2° (110/200 reflection) and 36.3°, related with the β-phase crystal of PVDF, are shown in Figure S5. , The enhancement of the β content in the composite films with the MF copolymer, compared to that in the CNT/PVDF/HNBR mixture, implies that interactions of the MF copolymer with components in the composites influenced the PVDF crystal structure. Relatively higher β-phase contents in PVDF are known to be a factor that enhances the electrochemical performance of Li-ion batteries . MF copolymer-induced conformation tuning of PVDF may lead to the achievement of an optimized CNT/PVDF/HNBR structure application to Li-ion batteries.…”

Section: Results and Discussionmentioning

confidence: 99%

Multifunctional Additives for High-Energy-Density Lithium-Ion Batteries: Improved Conductive Additive/Binder Networks and Enhanced Electrochemical Properties

Ahn

Park

Kim

et al. 2021

ACS Appl. Mater. Interfaces

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Cylindrical-type cells have been widely adopted by major battery and electric vehicle manufacturers owing to their price competitiveness, safety, and easy expandability. However, placement of electrodes at the core of cylindrical cells is currently restricted because of high electrode curvature and the lack of specialized electrodes and electrode materials. Here, we report the realization of highly flexible high-energy-density electrodes (active material loading of >98.4%) that can be used at the cores of cylindrical cells. The improved properties result from the introduction of a multifunctional poly(melamine-co-formaldehyde) (MF copolymer) additive, which yields a relatively more fluidic and well-dispersed slurry using only 0.08 wt %. MF copolymer-mediated formation of completely wrapped CNT/PVDF networks on LiCoO 2 (LCO) and accompanying contact enhancement between LCO and carbon nanotubes (CNTs) resulted in an increase of electrical and mechanical properties of the two types (composites with or without collectors) of electrodes compared with those of additive-free electrodes. Flexibility tests were carried out by rolling electrodes onto cylinder substrates (diameters of ca. 1 and 10 mm); this process resulted in relatively lower resistance changes of the MF copolymer-containing electrodes than for the reference electrodes. In addition, capacity retention after 100 cycles for cells with and without MF copolymers was approximately 10−20% better for the samples with the MF copolymer than for those without. CNT/PVDF networks with MF copolymers were proven to induce a relatively thin and stable cathode electrolyte interface layer accompanying the chemical bond formation during cycling.

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“…Different crystalline phases of PVDF could also be determined using the FT-IR technique. Peaks around 480, 532, 760, 795, 1149, 1209, and 1423 cm −1 could be assigned to α-phase, while peaks attributed to β-phase appeared at 473, 840, and 1266 cm −1 [ 25 , 26 , 27 , 28 ]. BaTiO 3 was characterized by two main absorption peaks, one at around 492 cm −1 , which was attributed to Ti–O vibrations, and the other at 1440 cm −1, related to Ba–Ti–O stretching vibrations [ 29 ].…”

Section: Resultsmentioning

confidence: 99%

PVDF-BaTiO3 Nanocomposite Inkjet Inks with Enhanced β-Phase Crystallinity for Printed Electronics

Abdolmaleki

Agarwala

2020

Polymers

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Polyvinylidene difluoride (PVDF) and its copolymers are promising electroactive polymers showing outstanding ferroelectric, piezoelectric, and pyroelectric properties in comparison with other organic materials. They have shown promise for applications in flexible sensors, energy-harvesting transducers, electronic skins, and flexible memories due to their biocompatibility, high chemical stability, bending and stretching abilities. PVDF can crystallize at five different phases of α, β, γ, δ, and ε; however, ferro-, piezo-, and pyroelectric properties of this polymer only originate from polar phases of β and γ. In this research, we reported fabrication of PVDF inkjet inks with enhanced β-phase crystallinity by incorporating barium titanate nanoparticles (BaTiO3). BaTiO3 not only acts as a nucleating agent to induce β-phase crystallinity, but it also improves the electric properties of PVDF through synergistic a ferroelectric polarization effect. PVDF-BaTiO3 nanocomposite inkjet inks with different BaTiO3 concentrations were prepared by wet ball milling coupled with bath ultrasonication. It was observed that the sample with 5 w% of BaTiO3 had the highest β-phase crystallinity, while in higher ratios overall crystallinity deteriorated progressively, leading to more amorphous structures.

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Improved battery performance contributed by the optimized phase ratio of β and α of PVDF

Abstract: Inorganic salts (LiCl) were induced to improve the ratio of β and α of PVDF by the solution method.

Cited by 17 publications

References 40 publications

Synthesis of a biomimetic zwitterionic pentapolymer to fabricate high-performance PVDF membranes for efficient separation of oil-in-water nano-emulsions

Synthesis of a biomimetic zwitterionic pentapolymer to fabricate high-performance PVDF membranes for efficient separation of oil-in-water nano-emulsions

Multifunctional Additives for High-Energy-Density Lithium-Ion Batteries: Improved Conductive Additive/Binder Networks and Enhanced Electrochemical Properties

PVDF-BaTiO3 Nanocomposite Inkjet Inks with Enhanced β-Phase Crystallinity for Printed Electronics

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