An enhanced poly(vinylidene fluoride) matrix separator with TEOS for good performance lithium-ion batteries

Liu, Jiuqing; Wang, Cheng; Wu, Xiufeng; Zhu, Fuliang; Li, Meng; Yang, Xi

doi:10.1007/s10008-018-4126-5

Cited by 13 publications

(7 citation statements)

References 25 publications

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“…PVDF is a semicrystalline polymer that can crystallize in five distinct crystalline phases associated with the different PVDF chain conformations, the β phase being the one with the largest piezoelectric response . Further, PVDF possesses a high dipole moment, high dielectric constant, good thermal and chemical stability, and excellent mechanical properties. , The excellent properties of PVDF allow its applicability in different areas, ranging from sensors and actuators, , to batteries , and biomedical applications, , among others.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ionic Liquid Content on the Crystallization Kinetics and Morphology of Semicrystalline Poly(vinylidene Fluoride)/Ionic Liquid Blends

Correia

Costa

Rodríguez-Hernández

et al. 2020

Crystal Growth & Design

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The crystallization kinetics of poly(vinylidene fluoride) (PVDF) in blends with the ionic liquid (IL) 1-ethyl-3-methylimidazolium chloride [Emim][Cl] has been studied as a function of [Emim][Cl] content up to 40 wt %. Blends were produced by a solvent casting technique from diluted solutions and solvent evaporation at a temperature higher than the melting point of PVDF followed by cooling to room temperature. Polymer phase, morphology, and crystallization behavior were evaluated. When the molten blend was crystallized from the melt, it was observed that [Emim][Cl] induces nucleation of PVDF in the electroactive and highly polar β-crystalline phase, while pure PVDF crystallizes in the α phase with the same thermal treatments. It is shown that PVDF crystal growth segregates an amorphous phase rich in IL molecules to the surface of the films and that the IL also remains in the spaces between the lamellae or between spherulites as demonstrated by scanning electronic microscopy (SEM) and polarizing optical microscope (POM) images. Differential scanning calorimetry results of isothermal crystallization show the dependence of equilibrium melting temperature and the Avrami exponent with the [Emim][Cl] content.

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Section: Introductionmentioning

confidence: 99%

“…4 Further, PVDF possesses a high dipole moment, high dielectric constant, good thermal and chemical stability, and excellent mechanical properties. 5,6 The excellent properties of PVDF allow its applicability in different areas, ranging from sensors 7 and actuators, 2,5 to batteries 8,9 and biomedical applications, 10,11 among others.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ionic Liquid Content on the Crystallization Kinetics and Morphology of Semicrystalline Poly(vinylidene Fluoride)/Ionic Liquid Blends

Correia

Costa

Rodríguez-Hernández

et al. 2020

Crystal Growth & Design

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show abstract

“…Furthermore, the transverse diffusion of Li ions is enhanced because of the rich 3D Li + transmission pathways in the porous 3D architecture of the PVDF-HFP layers, which effectively retard the movement of Li + toward “hot spots” (Figure d). Accordingly, there is uniform Li + flux on the polymer/lithium interface and this results in uniform deposition of Li and improved electrochemical performance. ,,, …”

Section: Resultsmentioning

confidence: 99%

“…Accordingly, there is uniform Li + flux on the polymer/lithium interface and this results in uniform deposition of Li and improved electrochemical performance. 19,49,60,61 The electrochemical stability window, which can be used to evaluate the electrochemical stability of electrolytes, was obtained using linear sweep voltammetry (LSV). As seen in Figure 8a, the current increased sharply at ∼4.6 V (vs Li/Li + ) for pristine Celgard and it increased sharply at ∼4.7 V (vs Li/ Li + ) for the pure PVDF-HFP GPE.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Rational Design of Sandwich-Like “Gel–Liquid–Gel” Electrolytes for Dendrite-Free Lithium Metal Batteries

Yang

Sun

Bai

et al. 2020

Ind. Eng. Chem. Res.

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Issues of lithium dendrite growth still hinder the popular application of lithium metal batteries (LMBs). Herein, we demonstrate that "gel−liquid−gel" electrolytes effectively suppress the growth of dendrites. This sandwich structure is based on introducing gel polymer coating layers, which consist of polyvinylidene fluoridehexafluoropropylene (PVDF-HFP), onto both sides of a Celgard separator. The PVDF-HFP layers improve the overall liquid electrolyte retention and compatibility with lithium anodes. They also lead to a uniform Li-ion flux at the polymer/lithium interface, which results in the suppression of dendrite nucleation. Impressively, Li|Cu cells operate stably for over 400 cycles with a high Coulombic efficiency of ∼98%. Li|Li symmetric cells enable highly stable Li plating/stripping cycling for over 1200 h at 1 mA cm −2 . Li|LiFePO 4 full cells also exhibit excellent cycling performance. We expect this work to have great potential in the application of simple composite gel polymer electrolytes to achieve highly safe LMBs.

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“…A poly(vinylidene fluoride)/tetraethyl orthosilicate silane (PVDF/TEOS) composite separator with a fingerlike pore structure for lithium-ion batteries has been prepared by nonsolvent-induced phase separation (NIPS) [114]. This novel PVDF/TEOS composite separator shows an ion conductivity of 1.22 mS.cm -1 at 25 °C, lithium-ion transference number with 0.7% TEOS of 0.481and show good cycling performance and rate capability [114].…”

Section: Figure 53 -Schematic Representation Of Separators With Different Patterns -Hexagons Linesmentioning

confidence: 99%

Synthetic polymer-based membranes for lithium-ion batteries

Martins

Nunes-Pereira

Lanceros‐Méndez

et al. 2020

Synthetic Polymeric Membranes for Advanced Water Treatment, Gas Separation, and Energy Sustainability

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Efficient energy storage systems are increasingly needed due to advances in portable electronics and transport vehicles, lithium-ion batteries standing out among the most suitable energy storage systems for a large variety of applications. In lithium-ion batteries, the porous separator membrane plays a relevant role as it is placed between the electrodes and serves as a charge transfer medium and affects the cycle behavior. Typically, porous separators membranes are comprised of a synthetic polymeric matrix embedded in the electrolyte solution.The present chapter focus on recent advances in synthetic polymers for porous separation membranes, as well as on the techniques for membrane preparation and physicochemical characterization. The main challenges to improve synthetic polymer performance for battery separator membrane applications are also discussed.

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An enhanced poly(vinylidene fluoride) matrix separator with TEOS for good performance lithium-ion batteries

Cited by 13 publications

References 25 publications

Effect of Ionic Liquid Content on the Crystallization Kinetics and Morphology of Semicrystalline Poly(vinylidene Fluoride)/Ionic Liquid Blends

Effect of Ionic Liquid Content on the Crystallization Kinetics and Morphology of Semicrystalline Poly(vinylidene Fluoride)/Ionic Liquid Blends

Rational Design of Sandwich-Like “Gel–Liquid–Gel” Electrolytes for Dendrite-Free Lithium Metal Batteries

Synthetic polymer-based membranes for lithium-ion batteries

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