Electrochemical studies on inert filler incorporated poly (vinylidene fluoride - hexafluoropropylene) (PVDF - HFP) composite electrolytes

Wilson, J.; Ravi, G.; Kulandainathan, M. Anbu

doi:10.1590/s0104-14282006000200006

Cited by 25 publications

(9 citation statements)

References 31 publications

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“…Figure 1 shows the XRD pattern of (a) pure PVDF-HFP and (b) optimized PGE. Figure 1a of pure PVDF-HFP shows predominant broad peaks at 2θ = 20 • and 38 • corresponding to the (020) and (021) crystalline peaks of PVDF-HFP [19,20]. The presence of broad peaks indicates semi-crystalline nature of polymer in which crystalline regions are mixed with the amorphous phase.…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Preparation of polyvinylidene fluoride-co-hexafluoropropylene-based polymer gel electrolyte and its performance evaluation for application in EDLCs

2019

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Polymer gel electrolyte (PGE) film is prepared by incorporating polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) as polymer, ethylene carbonate (EC)-propylene carbonate (PC) as plasticizers and tetraethylammonium tetrafluoroborate (TEABF 4) as salt using solution cast technique. By varying weight percentages of EC-PC-TEABF 4 into a host polymer, different samples of PGE were prepared, and the concentration of EC-PC-TEABF 4 was optimized for maximum conductivity, and stability of the prepared film. The maximum ionic conductivity of the order of 4.9 × 10 −3 S cm −1 was determined for 80 wt% of [EC-PC (1:1 v/v)-TEABF 4 (1.0 M)]. From the conductivity as a function of temperature, activation energy E a was calculated and it is about 0.06 eV. Overall, the amorphous structure was confirmed by X-ray diffraction analysis. Dielectric and impedance spectroscopic analysis was also carried out to understand the electrical behaviour of electrolyte using modified Debye's function. An ionic character of prepared electrolyte was confirmed from DC polarization method. The ionic transference number of 0.91 was calculated from the data while the electrical potential stability window was found to be 3.8 V. The electrical performance of prepared PGE was examined by fabricating electrical double-layer capacitor (EDLC). In a supercapacitor, commercially procured activated carbon electrodes were employed. The specific capacitance of EDLC cell is found to be ∼60 mF cm −2 , and equivalent single-electrode capacitance is about 39 F g −1 .

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Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

Preparation of polyvinylidene fluoride-co-hexafluoropropylene-based polymer gel electrolyte and its performance evaluation for application in EDLCs

2019

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“…As the advanced version of a PVDF based polymer, PVDF-HFP, the copolymer of vinylidene uoride and hexauoropropylene, performs better than PVDF mainly due to the presence of an amorphous domain of hexauoro propylene, which overcomes the problem of syneresis. 47 Fig. 2 depicts the thermal degradation of the SG electrolyte and SG/PVDF-HFP membrane, in a N 2 gas atmosphere.…”

Section: Synthesis and Characterization Of Lithium 4-styrenesulfonyl(...mentioning

confidence: 99%

A high performance polysiloxane-based single ion conducting polymeric electrolyte membrane for application in lithium ion batteries

et al. 2015

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We report a polysiloxane based single-ion conducting polymer electrolyte (SIPE) synthesized via hydrosilylation technique. Styrenesulfonyl (phenylsulfonyl) imide groups were grafted on the highly flexible polysiloxane chains followed by lithiation. The highly delocalized anionic charges in the grafted moiety give rise to weak association with lithium ions in the polymer matrix, resulting in lithium ion transference number close to unity (0.89) and remarkably high ionic conductivity (7.2 ×10 -4 Scm -1 ) at room temperature. The high flexibility arising from polysiloxane enables the glass transition temperature (T g ) to be below room temperature. The electrolyte membrane displays high thermal stability and a strong mechanical strength. A coin cell assembled with the membrane comprised of the electrolyte and poly(vinylidene-fluoride-cohexafluoropropene) (PVDF-HFP) performs remarkably well over a wide range of temperature with high charge-discharge rates.12 rule in a three step cyclic process.[36] Following the same mechanism, here, the vinylic part of SPSIK was attached to the polysiloxane chains upon addition of a Si-H bond.The grafting of SPSIK on PMHS chains followed by exchange of K + ions by Li + ions was clearly proven to be successful by FTIR and NMR spectra. As can be seen in the FTIR spectra of PMHS and SG (Fig. 1), the peak at 2167 cm -1 in PMHS, corresponding to Si-H bond, is disappeared in SG, which confirms the grafting of SPSIK. In addition, the peak at 1627 cm -1 in SPSIK, corresponding to the vinylic group, is also disappeared in SG, confirming the grafting, which consumes the vinylic group. Furthermore, the signature signal of Si-H, appears at 4.68 ppm ( 1 H NMR) in PMHS, and the three peaks in the range of 6.78 to 5.31 ppm ( 1 H NMR) in SPSIK corresponding to 3 vinylic protons, are disappeared in SG, validating the grafting of SP on the PMHS chains. [43,46]. Finally, the overall synthesis of SG electrolyte was confirmed by the coherence between the expected and the found values for all the elements, except for Si, in the elemental analysis. The deviation observed for Si is mainly attributed to the incomplete digestion of Si during the analysis, which was also noticed during the elemental analysis of commercial products of Si such as PMHS and poly(methylphenylsiloxane)(PMPS) ( Table S1 in Supporting Information). The GPC analysis of SG in the tetrahydrofuran (THF) mobile phase depicts the number average molecular weight (Mn) of 84,238, weight average molecular weight (Mw) of 150,230, and poly dispersity index (PDI) of 1.78 based on the polystyrene standard.

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“…41 The peaks of PVDF film at 2θ = 18.4°, 19.8°, 26.3°, and 39.4°correspond to (100), (020), (110), and (021) set of planes of crystalline PVDF, respectively. 42 PVDF−PAN film showed weaker PVDF peaks with decreased crystallinity structures, indicating that PAN impedes the crystallization of PVDF and retains the amorphous domains, which may lead to the faster Li + migration (Figure 1g). 43 The X-ray photoelectron spectroscopy (XPS) analysis also clearly showed the C−F and CN groups of PVDF−PAN which agrees with the FTIR results (Figure S5).…”

Section: Resultsmentioning

confidence: 99%

Phase-Separation-Induced Porous Lithiophilic Polymer Coating for High-Efficiency Lithium Metal Batteries

Wang

Liu

et al. 2021

Nano Lett.

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Solid-electrolyte interphase (SEI) plays a pivotal role in stabilizing lithium (Li) metal anode for rechargeable batteries. However, electrolyte-derived SEI often suffers from poor stability, leading to Li dendrite growth, consumption of electrolyte, and short cycle life. Here, we report a porous lithiophilic polymer coating induced by phase separation of polyvinylidenefluoride−polyacrylonitrile (PVDF−PAN) blends for stabilizing Li metal anode. Different from single polymer coating, PVDF−PAN blends protective layer with porous structures caused by phase separation can provide effective Li + transport channels and regulate uniform Li + flux. The lithiophilic functional groups of C N and C−F can promote uniform Li deposition and accelerate Li + diffusion at the same time during plating/stripping process. As a result, Li||NCM811 full cells using PVDF−PAN coated Li present an apparently improved cycling stability and higher Coulombic efficiency with lean electrolyte (7.5 μL mA h −1 ), limited Li supply (N/P ratio = 2.4), and high areal capacity (4.0 mA h cm −2 ).

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Electrochemical studies on inert filler incorporated poly (vinylidene fluoride - hexafluoropropylene) (PVDF - HFP) composite electrolytes

Cited by 25 publications

References 31 publications

Preparation of polyvinylidene fluoride-co-hexafluoropropylene-based polymer gel electrolyte and its performance evaluation for application in EDLCs

Preparation of polyvinylidene fluoride-co-hexafluoropropylene-based polymer gel electrolyte and its performance evaluation for application in EDLCs

A high performance polysiloxane-based single ion conducting polymeric electrolyte membrane for application in lithium ion batteries

Phase-Separation-Induced Porous Lithiophilic Polymer Coating for High-Efficiency Lithium Metal Batteries

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