scholarly journals A New Class of P(VdF-HFP)-CeO2-LiClO4-Based Composite Microporous Membrane Electrolytes for Li-Ion Batteries

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
G. Vijayakumar ◽  
S. N. Karthick ◽  
A. Subramania
Keyword(s):  
Composite Membrane ◽  
Phase Inversion ◽  
Vinylidene Fluoride ◽  
Composite Membranes ◽  
Cycling Performance ◽  
Microporous Membrane ◽  
Inversion Method ◽  
Electrolyte Uptake ◽  
A Cell ◽  
Polymer Dissolution

Composite microporous membranes based on Poly (vinylidene fluoride–co-hexafluoro propylene) P(VdF-co-HFP)-CeO2were prepared by phase inversion and preferential polymer dissolution process. It was then immersed in 1M LiClO4-EC/DMC (v/v=1:1) electrolyte solution to obtain their corresponding composite microporous membrane electrolytes. For comparison, composite membrane electrolytes were also prepared by conventional phase inversion method. The surface morphology of composite membranes obtained by both methods was examined by FE-SEM analysis, and their thermal behaviour was investigated by DSC analysis. It was observed that the preferential polymer dissolution composite membrane electrolytes (PDCMEs) had better properties, such as higher porosity, electrolyte uptake (216 wt%), ionic conductivity (3.84 mS⋅cm−1) and good electrochemical stability (4.9 V), than the phase inversion composite membrane electrolytes (PICMEs). As a result, a cell fabricated with PDCME in between mesocarbon microbead (MCMB) anode and LiCoO2cathode had better cycling performance than a cell fabricated with PICME.

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

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 405 ◽  
Author(s):  
Ponnaiah Arjunan ◽  
Mathiyalagan Kouthaman ◽  
Rengapillai Subadevi ◽  
Karuppiah Diwakar ◽  
Wei-Ren Liu ◽  
...  
Keyword(s):  
Silicon Dioxide ◽  
Composite Membrane ◽  
Phase Inversion ◽  
Sodium Ion ◽  
Inversion Method ◽  
Electrochemical Performances ◽  
Suitable Alternative ◽  
Electrolyte Uptake ◽  
Composite Separator ◽  
Phase Inversion Method

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.

scholarly journals Use of Silica Gel from Volcanic Ash as Chitosan Composite Membrane’s Filler

2019 ◽  
Vol 31 (10) ◽  
pp. 2303-2305
Author(s):  
Maulida Lubis ◽  
Lilis Sukeksi ◽  
Mara Bangun Harahap ◽  
Melva Ginting ◽  
Herlinawati Wici ◽  
...  
Keyword(s):  
Water Absorption ◽  
Silica Gel ◽  
Composite Membrane ◽  
Phase Inversion ◽  
Volcanic Ash ◽  
Composite Membranes ◽  
Inversion Method ◽  
Stirring Time ◽  
Phase Inversion Method ◽  
Chitosan Composite

This study aims to determine the process of making composite membranes of chitosan and silica fillers from volcanic ash of Sinabung mountain and determine the physical properties of chitosan composite membranes viz. degree of water absorption, functional groups. In this study, composite membranes were made using phase inversion method with the composition of chitosan and silica used were 2 g of chitosan and variations in dosage of fillers 0.6, 0.9 and 1.2 g of silica, while the stirring time was 8, 12 and 16 h. Based on the results , the best membrane conditions were obtained from composite membrane analysis with the best conditions of composite membranes at water absorption is 44.58 %. From the results of FTIR analysis, indicated the presence of OH bonds and Si-O-Si bonds on composite membranes caused by silica gel characteristics of composite membranes also supported by EDX analysis showed composite membrane contained carbon 55.17 %, oxygen 20.36 % and silicon 10.42 %.

High Performance Electrospun PVdF-HFP/MMT Nanofibrous Composite Membrane Electrolyte for Li-Ion Capacitors

2017 ◽  
Vol 14 ◽  
pp. 1-15
Author(s):  
Arun Kumar Solarajan ◽  
Vignesh Murugadoss ◽  
Subramania Angaiah
Keyword(s):  
Composite Membrane ◽  
High Performance ◽  
Electrode Materials ◽  
Vinylidene Fluoride ◽  
Composite Membranes ◽  
Strength Analysis ◽  
Electrospinning Technique ◽  
Electrolyte Uptake ◽  
Poly Vinylidene Fluoride ◽  
Li Ion

The electrospun poly(vinylidene fluoride-co-hexafluoropropylene)/montmorillonite nanofibrous composite membranes (esCPMs) were prepared by electrospinning technique using a mixture of different amounts of montmorillonite (0, 3, 5, 7 and 10 wt%) into 16 wt% of PVDF-HFP polymer solution in 7:3 wt% of acetone and dimethylacetamide as the solvent. The effect of montmorillonite (MMT) on electrospun PVdF-HFP membrane has been studied by XRD, DSC, TGA and tensile strength analysis. It is found that electrospun PVDF-HFP/MMT nanofibrous composite membrane obtained using 5wt% MMT has a higher porosity, electrolyte uptake, ionic conductivity, electrochemical stability window and showed higher specific capacitance and good compatibility with electrode materials.

scholarly journals Adsorptive molecularly imprinted composite membranes for chiral separation of phenylalanine

2016 ◽  
Vol 18 (3) ◽  
pp. 22-29 ◽  
Author(s):  
Nasrullah Shah ◽  
Touseef Rehan ◽  
Joong Kon Park
Keyword(s):  
Composite Membrane ◽  
Chiral Separation ◽  
Phase Inversion ◽  
Composite Membranes ◽  
Adsorption Selectivity ◽  
Molecularly Imprinted ◽  
Phase Inversion Technique ◽  
Uniform Dispersion ◽  
Polymeric Solutions ◽  
And Control

Abstract Two types of composite imprinted membranes, i.e., composite membrane comprised of D-Phe imprinted beads and D-Phe imprinted membrane or DCM and composite membrane comprised of L-Phe imprinted beads and L-Phe imprinted membranes or LCM, were synthesized by phase inversion technique after a uniform dispersion of beads within the polymeric solutions using simple physico-mechanical process. The assemblies of the prepared DCM, LCM and control membranes were employed in ultrafiltration for chiral separation of D, L-Phenylalanine racemate solution. DCM and LCM showed an improved adsorption capacity (0.334 mg g-1 and 0.365 mg g-1 respectively), and adsorption selectivity (2.72 and 2.98 respectively). However, the percent rejection of the template and counter enantiomer were lower than that of control membranes. Compared to control membrane, the DCM and LCM showed inverse permselectivity. These composite membranes having better adsorption and separation ability for Phenylalanine racemate solution will be suitable in the future for various other applications.

scholarly journals EFFECT OF BENTONITE AS FILLER IN COMPOSITE MEMBRANE PERFORMANCE POLYVINYLIDENE FLUORIDE (PVDF)-POLYMETHYLMETHACRYLATE (PMMA)

2018 ◽  
Vol 18 (1) ◽  
pp. 26-31
Author(s):  
Erda Marniza ◽  
Marlina . ◽  
M Nasir
Keyword(s):  
Composite Membrane ◽  
Polyvinylidene Fluoride ◽  
Oil And Gas ◽  
Tween 80 ◽  
Composite Membranes ◽  
Wave Number ◽  
Water Model ◽  
Inversion Method ◽  
Ftir Characterization ◽  
Oily Waste

Abstract. The effect of bentonite as filler on the performance of the composite membrane of PVDF-PMMA has been performed. This study was conducted to determine the performance PVDF-PMMA composite membranes and membrane applications PVDF-PMMA-Bentonite on oily wastes. Bentonite is obtained from North Aceh while PVDF membrane-PMMA by phase inversion method. This study uses an oily waste water model was made by mixing surfactant tween 80 with concentration of 2% with palm oil and gas oil. Membrane PVDF-PMMA-Bentonite is analyzing using cell ultrafiltration (flux test), FTIR and SEM-EDX. The results showed that the value of flux with the addition of bentonite is greater than without bentonite. Good flux values contained in the PVDF-PMMA-Bentonite (1:1:2) amounted to 32.143 L/m2.h.bar with permeability of 21.428 L/m2.h. FTIR characterization analysis results show that bentonite can add to pore at wave number 1520 cm -1 and 1660 cm-1 SEM and EDX results showed regular shape and uniform pore. Keywords: Membrane, bentonite, filler, FTIR, SEM-EDX, Oily wastewater 

scholarly journals Study of the Effectiveness of Titanium Dioxide (TiO2) nanoparticle in Polyethersulfone (PES) Composite Membrane for Removal of Oil in Oily Wastewater

2017 ◽  
Vol 19 (1) ◽  
Author(s):  
Munawar Zaman Shahruddin ◽  
Nuratikah Zakaria ◽  
Nurul Fattin Diana Junaidi ◽  
Nur Hashimah Alias ◽  
Nur Hidayati Othman
Keyword(s):  
Contact Angle ◽  
Tio2 Nanoparticles ◽  
Composite Membrane ◽  
Composite Membranes ◽  
Degradation Process ◽  
Angle Measurement ◽  
Tio2 Nanoparticle ◽  
Inversion Method ◽  
Oily Wastewater ◽  
Cross Sectional

Polyethersulfone/Titanium oxide (PES/TiO2) composite membranes at various compositions of TiO2 nanoparticle (0, 0.1 and 0.5 wt. %) were prepared via phase inversion method. The prepared composite membranes were then tested for degradation process and separation process for oily wastewater. It was found that the addition of TiO2 that possess visible-light response activity led to an improvement of the membrane performances especially in photocatalytic activities. The membrane performances were also investigated by using liquid separation system in order to obtain the flux/permeation rate and also the percentage of oil removal by the membranes. The results indicate that the increment the amount of TiO2 nanoparticle in the composite membrane reduced the permeation flux. Further study has been made by characterizing the membranes in terms of contact angle, Field Emission Scanning Electron Microscope (FESEM), Fourier Transform Infrared Spectrometer (FTIR) and X-Ray Diffraction (XRD) analysis. The characterization results indicate that the TiO2 nanoparticles were uniformly mixed in the membrane. The increased of membrane hydrophilicity was demonstrated by the contact angle measurement. By adding TiO2, the membrane hydrophilicity was observed to be better than the neat PES composite membrane. Cross sectional images from FESEM also indicate that the addition of TiO2 nanoparticles help in increasing the macro-void of the membranes. Finally, a comparison between neat PES membrane and PES/TiO2 nanoparticle membrane proved that addition of TiO2 nanoparticle can be one of the ways to maximize the removal of oil.

PEI-SiO2 composite membranes with high thermal stability: Synthesis by self-assembled in situ growth and application in lithium-ion batteries

2020 ◽  
pp. 095400832096455
Author(s):  
Wei Song ◽  
Weiwei Cui ◽  
Xu Wang ◽  
Zeyu Lin ◽  
Wei Deng ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Lithium Ion Batteries ◽  
Composite Membrane ◽  
Retention Rate ◽  
Lithium Ion ◽  
Composite Membranes ◽  
High Porosity ◽  
Electrolyte Uptake ◽  
Electrochemical Window

To improve the safety of lithium-ion batteries (LIBs), a polyether amide–silica (PEI-SiO2) composite membrane was developed by the in situ hydrolysis of tetraethylorthosilicate (TEOS) and its subsequent self-assembly on the surface of PEI fibers. Because of the presence of the SiO2 shell, the PEI-SiO2 composite membrane exhibited good thermal stability at high temperatures. The composite membrane did not change its color and size after heating at 200°C for 1 h as well as exhibited excellent flame retardancy. Moreover, the membrane maintained its high porosity even after the introduction of shell layers. The electrolyte is completely absorbed in the membrane within 0.5 s. The electrolyte uptake was up to 625%, and the ionic conductivity was up to 1.9 mS/cm at room temperature. Compared to the polyolefin membrane and the pure PEI membrane, the PEI-SiO2 composite membrane showed higher electrochemical stability, with an electrochemical window of up to 5.5 V. The battery assembled with the composite membrane showed excellent cycle stability, and the capacity retention rate was as high as 98.6% after 50 cycles. The LIBs based on the PEI-SiO2 composite membrane exhibited safe operation and high electrochemical performance, thus highlighting the applicability of the composite membrane in high-power batteries.

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