Microphase Separation and Conductivity Behavior of Poly(propylene oxide)-Lithium Salt Electrolytes

Vachon, C.; Labrèche, C.; Vallée, Annie; Besner, Simon; Dumont, Marie‐Josée; Prud’homme, J.

doi:10.1021/ma00120a025

Cited by 72 publications

(79 citation statements)

References 4 publications

(5 reference statements)

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“…The melting temperatures (T m ) also depend on the salt concentration and the crystallinity behavior of the system is similar to electrolytes based on binary PEO blends [11], in which a decrease in the overall crystallinity is detected with the increase of salt content. This decrease in the electrolyte crystallinity with the salt content can be attributed to the coordination of cations by basic sites of the polymers in the matrix, which restricts certain chain segment translations and inhibits the crystallization [12]. Coherent with this hypothesis, recrystallization peaks are found for electrolyte samples with In order to prevent lower ion mobility, the electrolytes should present low T g values and, for the PEO/PVPh-HEM/LiClO 4 samples, glass transition temperatures are lower than −10°C, leading to a viscoelastic behavior over a temperature range of more than 50°C, suitable for the applications intended.…”

Section: Resultsmentioning

confidence: 99%

Solid electrolytes based on poly(ethylene oxide)/poly(4-vinyl phenol-co-2-hydroxyethyl methacrylate) blends and LiClO4

Rocco

Pereira

2015

Solid State Ionics

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Section: Resultsmentioning

confidence: 99%

Solid electrolytes based on poly(ethylene oxide)/poly(4-vinyl phenol-co-2-hydroxyethyl methacrylate) blends and LiClO4

Rocco

Pereira

2015

Solid State Ionics

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“…Polyethylene oxide (PEO), polypropylene oxide (PPO), and 4 poly[bis(methoxy-ethoxyethoxy) phosphazene] (MEEP) are all promising Type I polymer electrolytes. [12][13][14][15][16] The electron-donating groups incorporated into the polymer architecture are responsible for solvating the lithium ion while the fast segmental dynamics promote high ionic conductivities through fluctuation-driven diffusion. [17][18][19] However, Type I polymer electrolytes typically suffer from poor mechanical properties, which is an unfortunate compromise for the fast segmental dynamics.…”

Section: The 21mentioning

confidence: 99%

Method of Measuring Salt Transference Numbers in Ion-Selective Membranes

Vardner

Ling

Russell

et al. 2017

J. Electrochem. Soc.

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A technique to measure the cation-transference number of salts in fully hydrated ion-selective membranes has been developed and demonstrated on Nafion 117 for LiCl and Li 2 SO 4 . Dilute solution theory is used to identify experimental conditions that reduce the propagation of uncertainties in membrane properties to transference number estimates. This technique has advantages over commonly used methods, including the elimination of the need for the analysis of electrode potentials in approaches that exploit electroanalytical methods or the need for additional information required to reconcile NMR-based methods with the bulk transport property. It additionally allows for numerous measurements per day and offers the possibility to relate trace measurements of either cations or anions to values of transference number. For LiCl both modes of the technique were employed; the anion-tracer method is more precise and gives t + = 0.936 ± 0.010. The experimental procedure was repeated using the cation-tracer method for Li 2 SO 4 , and t + = 0.95 ± 0.06 was estimated. The 21 st century presents a key challenge in energy storage due to the intermittency of wind and solar energy sources. Lithium ion batteries, fuel cells, and redox flow batteries are promising technologies for energy storage since they have high energy densities, are environmentally friendly, and have an array of other desirable properties. [1][2][3][4][5][6] Solid electrolytes are ubiquitous for these energy storage systems since they serve the important function of mechanical separation between electrodes. In addition, solid electrolytes circumvent several problems associated with liquid electrolytes such as the leakage of electrolyte solution and the reaction of volatile organic solvents.7 Of the solid electrolytes, polymer electrolytes have garnered the most interest in recent years. [8][9][10][11] These membranes facilitate ionic transport between electrodes, inhibit electron flow between electrodes, prevent direct contact between electrodes, and minimize mixing of the anolyte and catholyte.In recent decades, researchers have sought to understand the relationship between the molecular structure of polymer electrolytes and their performance. These structure-property relationships have been developed for two major types of polymer electrolytes: (I) mixtures of salts in high molecular weight polymers and (II) polymerized ionic liquids (single ion conductors). Polyethylene oxide (PEO), polypropylene oxide (PPO), and 4 poly[bis(methoxy-ethoxyethoxy) phosphazene] (MEEP) are all promising Type I polymer electrolytes.12-16 The electron-donating groups incorporated into the polymer architecture are responsible for solvating the lithium ion while the fast segmental dynamics promote high ionic conductivities through fluctuation-driven diffusion. [17][18][19] However, Type I polymer electrolytes typically suffer from poor mechanical properties, which is an unfortunate compromise for the fast segmental dynamics. Furthermore, Type I polymer electrolytes have relative...

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“…It is clear that the presence of a flexible, amorphous phase in SPE is essential for higher ionic conductivity. Although many kinds of polymeric electrolytes such as poly(acrylonitrile) [10], poly(propylene oxide) [11], poly(methyl methacrylate) [12] and poly (maleic anhydridestyrene) [11] have been studied, high molecular weight PEO-based SPE is actively researched for technological applications and fundamental studies [6,13].…”

Section: Introductionmentioning

confidence: 99%

Effects of various LiPF6 salt concentrations on PEO-based solid polymer electrolytes

Ibrahim

Yassin

Ahmad

et al. 2011

Ionics

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In this research, various weight percents of LiPF 6 are incorporated into PEO-based polymer electrolyte system. Thin film electrolytes are prepared via solution casting technique and characterized by FTIR, XRD and DSC analyses in order to study their complex behaviour. The amorphicity of the electrolytes are measured by DC impedance. The results reveal that the conductivity increases with increasing temperature when the salt concentration increases to 20 wt.%. The conductivity for 20 wt.% of salt remains similar to the conductivity of 15 wt.% of salt at 318 K. Impedance studies show that the conductivity increases with increasing LiPF 6 concentration, whereas XRD studies reveal that the phase changes from crystalline to amorphous when LiPF 6 concentration increases. DSC studies indicate a decrease in T m with increasing LiPF 6 concentration. Finally, the complexation process is examined using FTIR.

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Microphase Separation and Conductivity Behavior of Poly(propylene oxide)-Lithium Salt Electrolytes

Cited by 72 publications

References 4 publications

Solid electrolytes based on poly(ethylene oxide)/poly(4-vinyl phenol-co-2-hydroxyethyl methacrylate) blends and LiClO4

Solid electrolytes based on poly(ethylene oxide)/poly(4-vinyl phenol-co-2-hydroxyethyl methacrylate) blends and LiClO4

Method of Measuring Salt Transference Numbers in Ion-Selective Membranes

Effects of various LiPF6 salt concentrations on PEO-based solid polymer electrolytes

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