The Effects of Magnetic Field Alignment on Lithium Ion Transport in a Polymer Electrolyte Membrane with Lamellar Morphology

Majewski, Paweł; Gopinadhan, Manesh

doi:10.3390/polym11050887

Cited by 26 publications

(18 citation statements)

References 40 publications

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“…The majority of the reported material systems exhibited conductivities of the BCE that were not consistent with an EMT description. These included high molecular weight, lamella-forming BCPs such as polystyrene- block -poly(ethylene oxide) (PS- b -PEO) that have f values as low as 0.015, and lamellae-forming BCEs aligned using external fields in an attempt to mitigate the effect of tortuosity described above that have f values below 0.1 . In the few studies where the reported values of f were within an order of magnitude of the values predicted for multigrained samples, (1) the materials’ systems were either lamellae-forming BCPs with small grain sizes at the scale of the lamellar period itself, such as PS- b -PEO that reach an f value of 0.2 , or (2) fully microphase-separated, lamellae-forming BCPs with high volume fractions of low molecular weight ionic liquids (ILs) with f values approaching the theoretical value of 0.66 .…”

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confidence: 99%

Role of Defects in Ion Transport in Block Copolymer Electrolytes

et al. 2019

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Ion conducting block copolymers can overcome traditional limitations of homopolymer electrolytes by phase separating into nanoarchitectures that can be simultaneously optimized for two or more orthogonal material properties such as high ionic conductivity and mechanical stability. A key challenge in understanding the ion transport properties of these materials is the difficulty of extracting structure−function relationships without having complete knowledge of all nanoscale transport pathways in bulk samples. Here we demonstrate a method for deriving structure-transport relationships for ion conducting block copolymers using thin films and interdigitated electrodes. Well-defined and directly imaged structure in films of poly(styrene)-block-poly(2-vinylpyridine) is controlled using techniques of directed self-assembly then the poly(2-vinylpyridine) is selectively converted into an ion conductor. The ion conductivity is found to be directly proportional to the total number of connected paths between electrodes and the path length. A single defect such as a dislocation anywhere in the path of an ion conducting route disconnects and precludes that pathway from contributing to the conductivity and results in an increase in the dielectric parameter of the film. When all the ion conduction pathways are blocked between electrodes, the conductivity is negligible, 4 orders of magnitude lower compared to a completely connected morphology and the dielectric parameter increases by a factor of 50. These results have profound implications for the interpretation, design, and processing of block copolymer electrolytes for applications as ion conducting membranes.

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confidence: 99%

Role of Defects in Ion Transport in Block Copolymer Electrolytes

et al. 2019

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“…The column materials possessed a mean effective pore size diameter of 10 3 Å and 10 5 Å, respectively. For the analysis, the polymer was dissolved in a solution of 10 mM 1-butylimidazole and 10 mM LiTFSI in tetrahydrofuran (THF), which was also used as eluent, and was analyzed at 23 • C with a flow rate of 1 mL min −1 [39]. The molecular weight was obtained using the MALLS detector and therefore, the refractive index increment (dn/dc) was determined with a refractometer dn/dc 2010 from PSS (Mainz, Germany) using ten different solutions from 1 g L −1 to 10 g L −1 polyIL in a solution of 10 mM 1-butylimidazole and 10 mM LiTFSI in THF (dn/dc = 0.1027 mL •g −1 ).…”

Section: Size Exclusion Chromatography (Sec)mentioning

confidence: 99%

Charge Transport and Glassy Dynamics in Blends Based on 1-Butyl-3-vinylbenzylimidazolium Bis(trifluoromethanesulfonyl)imide Ionic Liquid and the Corresponding Polymer

et al. 2022

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Charge transport, diffusion properties, and glassy dynamics of blends of imidazolium-based ionic liquid (IL) and the corresponding polymer (polyIL) were examined by Pulsed-Field-Gradient Nuclear Magnetic Resonance (PFG-NMR) and rheology coupled with broadband dielectric spectroscopy (rheo-BDS). We found that the mechanical storage modulus (G′) increases with an increasing amount of polyIL and G′ is a factor of 10,000 higher for the polyIL compared to the monomer (GIL′= 7.5 Pa at 100 rad s−1 and 298 K). Furthermore, the ionic conductivity (σ0) of the IL is a factor 1000 higher than its value for the polymerized monomer with 3.4×10−4 S cm−1 at 298 K. Additionally, we found the Haven Ratio (HR) obtained through PFG-NMR and BDS measurements to be constant around a value of 1.4 for the IL and blends with 30 wt% and 70 wt% polyIL. These results show that blending of the components does not have a strong impact on the charge transport compared to the charge transport in the pure IL at room temperature, but blending results in substantial modifications of the mechanical properties. Furthermore, it is highlighted that the increase in σ0 might be attributed to the addition of a more mobile phase, which also possibly reduces ion-ion correlations in the polyIL.

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“…Clusters formed by ring-like SMPs are generally not affected by the magnetic field. Majewski et al [ 43 ] used a constant magnetic field to control the arrangement of Li-doped lamellar polyethylene oxide (PEO) microdomains in a liquid crystalline diblock copolymer over large length scales (>3 mm), building up the electrolytic membrane. The ordering of microdomains increases the membrane conductivity to about 50%.…”

Section: Introductionmentioning

confidence: 99%

Modification of the Properties of Polymer Composites in a Constant Magnetic Field Environment

et al. 2021

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In this paper, polymer composites based on polylactide (PLA) and epoxy resin (Epidian 5) were studied in terms of the influence of magnetic induction on their changes in physicochemical properties. The composites contained admixtures in the form of magnetite (Fe3O4) and crystalline cellulose (Avicel PH-1010) in the amount of 10%, 20%, and 30% by weight and starch in the amount of 10%. The admixtures of cellulose and starch were intended to result in the composites becoming biodegradable biopolymers to some extent. Changes in physical and chemical properties due to the impact of a constant magnetic field with a magnetic induction value B = 0.5 T were observed. The changes were observed during tests of tensile strength, bending, impact strength, water absorbency, frost resistance, chemical resistance to acids and bases, as well as through SEM microscopy and with studies of the composition of the composites that use the EDS method and of their structure with the XRD method. Based on the obtained results, it was found that the magnetic induction value changes the properties of composites. This therefore acts as one method of receiving new alternative materials, the degradation of which in the environment would take far less time.

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The Effects of Magnetic Field Alignment on Lithium Ion Transport in a Polymer Electrolyte Membrane with Lamellar Morphology

Cited by 26 publications

References 40 publications

Role of Defects in Ion Transport in Block Copolymer Electrolytes

Role of Defects in Ion Transport in Block Copolymer Electrolytes

Charge Transport and Glassy Dynamics in Blends Based on 1-Butyl-3-vinylbenzylimidazolium Bis(trifluoromethanesulfonyl)imide Ionic Liquid and the Corresponding Polymer

Modification of the Properties of Polymer Composites in a Constant Magnetic Field Environment

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