PVdF-HFP and Ionic-Liquid-Based, Freestanding Thin Separator for Lithium-Ion Batteries

Caimi, Stefano; Wu, Hua; Morbidelli, Massimo

doi:10.1021/acsaem.8b00860

Cited by 24 publications

(30 citation statements)

References 87 publications

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“…After the hot-pressing, it is possible to obtain a freestanding, homogeneous and transparent 50-

m thick IL-based membrane (referred as PSiCIL membrane) containing the silica NPs at a nanoscale level. A SEM picture showing the preservation of the internal morphology after hot-pressing has been reported in our previous work [ 44 ]. To prevent water absorption, the PSiCIL membranes are stored in a nitrogen atmosphere.…”

Section: Resultsmentioning

confidence: 56%

“…A high-shear device, HC-5000 (Microfluidics, Westwood, MA, USA), connected to a L30Z microchannel with a width of 300

m, a rectangular cross section of 5.26·10

and a length of 5.8 mm was used to perform shear-driven gelation of the PVdF-HFP/SiO

NPs. The operating conditions for the gelation and subsequent drying to obtain the polymer-silica clusters (PSiCs) are reported elsewhere [ 44 ].…”

Section: Methodsmentioning

confidence: 99%

“…The obtained clusters were mixed with the IL solution at a mass fraction of PSiC/IL equal to 30/70 wt.%, following the procedure previously reported [ 44 ]. The slurry was then transferred between two aluminum sheets in a preheated hydraulic hand-press (Rondol, Strasbourg, France) and hot-pressed at 120

C and 10 kN to form the separator.…”

Section: Methodsmentioning

confidence: 99%

“…Poly(vinylidenefluoride- co -hexafluoropropylene) (PVdF-HFP) is chosen as it possesses high dielectric constant, it is chemically compatible with the electrode materials, and it is characterized by low crystallinity [ 27 , 28 , 39 , 43 ]. The method to form a freestanding, uniform and transparent membrane through hot-pressing, starting from the polymer/filler clusters and the IL has been developed earlier in our group and described elsewhere [ 44 ]. The effect of the presence of silica NPs in the IL-based membrane is investigated in terms of ionic conductivity and electrochemical cyclability.…”

Section: Introductionmentioning

confidence: 99%

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Effect of SiO2 Nanoparticles on the Performance of PVdF-HFP/Ionic Liquid Separator for Lithium-Ion Batteries

Caimi

Klaue

et al. 2018

Nanomaterials

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Safety concerns related to the use of potentially explosive, liquid organic electrolytes in commercial high-power lithium-ion batteries are constantly rising. One promising alternative is to use thermally stable ionic liquids (ILs) as conductive media, which are however, limited by low ionic conductivity at room temperature. This can be improved by adding fillers, such as silica or alumina nanoparticles (NPs), in the polymer matrix that hosts the IL. To maximize the effect of such NPs, they have to be uniformly dispersed in the matrix while keeping their size as small as possible. In this work, starting from a water dispersion of silica NPs, we present a novel method to incorporate silica NPs at the nanoscale level (<200 nm) into PVdF-HFP polymer clusters, which are then blended with the IL solution and hot-pressed to form separators suitable for battery applications. The effect of different amounts of silica in the polymer matrix on the ionic conductivity and cyclability of the separator is investigated. A membrane containing 10 wt.% of silica (with respect to the polymer) was shown to maximize the performance of the separator, with a room temperature ionic conductivity of of 1.22 mS cm−1. The assembled half-coin cell with LiFePO4 and Li as the cathode and the anode exhibited a capacity retention of more than 80% at a current density of 2C and 60 ∘C.

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“…After the hot-pressing, it is possible to obtain a freestanding, homogeneous and transparent 50-

Section: Resultsmentioning

confidence: 56%

“…A high-shear device, HC-5000 (Microfluidics, Westwood, MA, USA), connected to a L30Z microchannel with a width of 300

m, a rectangular cross section of 5.26·10

and a length of 5.8 mm was used to perform shear-driven gelation of the PVdF-HFP/SiO

NPs. The operating conditions for the gelation and subsequent drying to obtain the polymer-silica clusters (PSiCs) are reported elsewhere [ 44 ].…”

Section: Methodsmentioning

confidence: 99%

C and 10 kN to form the separator.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of SiO2 Nanoparticles on the Performance of PVdF-HFP/Ionic Liquid Separator for Lithium-Ion Batteries

Caimi

Klaue

et al. 2018

Nanomaterials

Self Cite

View full text Add to dashboard Cite

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“…The temperature dependent ionic conductivity plot for prepared membrane is shown in Figure 4d. Herein, the change in the linearity of the conductivity plot is attributed to the segmental motion of the polymer comprised in the matrix [30][31][32][33]. The typical charge discharge curve of prepared P2-NaFeMnO 2 material using PVdF-SiO 2 separator membrane was showed in Figure 5.…”

Section: Electrochemical Analysismentioning

confidence: 97%

Superior Ionic Transferring Polymer with Silicon Dioxide Composite Membrane via Phase Inversion Method Designed for High Performance Sodium-Ion Battery

et al. 2020

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Superior sodium-ion-conducting polymer poly(vinyledene fluoride)–silicon dioxide (PVdF-SiO2) composite separator membrane was prepared via simple phase inversion method, which is a suitable alternative conventional polypropylene membrane. Basically, PVdF is the promising for use as high porous polymer electrolyte membrane due to its high dielectric constant (ε = 8.4). In this work, we prepared a composite membrane using PVdF-SiO2 via phase inversion method. This work was systematically studied towards the morphology, porosity, and electrochemical properties of as prepared membrane. The electrolyte uptake capability of separator membrane tested with 1 M NaPF6 electrolyte solution and temperature-dependent ionic conduction test were performed at various temperatures. This membrane exhibits higher ionic conductivity of 4.7 × 10−2 S cm−1 at room temperature. The physical properties were analyzed by X-ray diffraction, FT-IR, and FE-SEM micrographs analyses. The electrochemical performances with impedance analysis carried for prepared membrane with the as-prepared sodium P2-type cathode material. The material showed an initial discharge capacity of 178 mAh g−1 at 0.1 C between 2 and 4 V with 98% columbic efficiency and 81% capacity retention after 50 cycles upon using the as-prepared PVdF-SiO2 composite separator membrane.

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Composition and Structure Design of Poly(vinylidene fluoride)‐Based Solid Polymer Electrolytes for Lithium Batteries

Zhou

Zhong

Dong

et al. 2023

Adv Funct Materials

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other areas, and play an important role in energy storage and conversion fields. [1][2][3][4][5][6][7] Nonetheless, the constantly expanding consumption market proposes higher demands for energy density and safety of LIBs, which encourages researchers to ulteriorly improve and optimize the existing LIBs system. The regulation of high-capacity electrode materials and wide operating voltage windows becomes the key to obtaining high energy density storage. In recent years, lithium metal anode has presented great application potential owing to the excellent theoretical specific capacity (3860 mA h g −1 ) and low electrode potential (−3.04 V vs standard hydrogen electrode (SHE)). The batteries assembled by lithium metal anode and high-capacity cathodes or high voltage cathodes achieve higher energy storage compared with traditional commercial LIBs. [8][9][10][11] However, lithium metal batteries (LMBs) have been suffering from liquid organic electrolyte safety issues. Generally, the volatile and flammable liquid organic electrolytes are easy to burn and burst when the batteries receive a violent impact or damage. [12][13][14] Uncontrolled lithium dendrites growth continuously consumes the electrolytes and increases the risk of short circuits. [15][16][17][18] Besides, liquid organic electrolytes are unstable in

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PVdF-HFP and Ionic-Liquid-Based, Freestanding Thin Separator for Lithium-Ion Batteries

Cited by 24 publications

References 87 publications

Effect of SiO2 Nanoparticles on the Performance of PVdF-HFP/Ionic Liquid Separator for Lithium-Ion Batteries

Effect of SiO2 Nanoparticles on the Performance of PVdF-HFP/Ionic Liquid Separator for Lithium-Ion Batteries

Superior Ionic Transferring Polymer with Silicon Dioxide Composite Membrane via Phase Inversion Method Designed for High Performance Sodium-Ion Battery

Composition and Structure Design of Poly(vinylidene fluoride)‐Based Solid Polymer Electrolytes for Lithium Batteries

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