Thermal behavior of new polymer electrolytes

Fauteux, D.; McCabe, P. H.

doi:10.1002/pat.1995.220060205

Cited by 20 publications

(16 citation statements)

References 3 publications

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“…In other words, the modulus decreases due to change of structure, whereas the activation energy for entanglement dynamics increases due to the ionic cross-linking of the ether units in the PEO backbone (PEO-ion complexation). The latter result aligns with other literature reports, such as the increase of PEO T g with increasing salt content. − The activation energy from XPCS was about 1 order of magnitude higher than that from rheology for all the salt concentrations studied.…”

Section: Discussionsupporting

confidence: 91%

Structural Dynamics of Strongly Segregated Block Copolymer Electrolytes

et al. 2018

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Polymer electrolytes are promising materials for high energy density rechargeable batteries. However, they have low ion transport rates and gradually lose electrode adhesion during cycling. These effects are dependent on polymer structure and dynamics. This motivates an investigation of diblock copolymer electrolyte dynamics. Structural and stress relaxations have been measured with X-ray photon correlation spectroscopy (XPCS) and rheology, respectively, as a function of salt concentration and temperature. The polymer electrolyte studied in this work is a mixture of poly(styrene-b-ethylene oxide), SEO, and lithium bistrifluoromethanesulfonimide (LiTFSI). Results from XPCS experiments showed hyperdiffusive motion for various lithium salt concentrations and at varying temperatures, which is indicative of soft glassy materials. This behavior is attributed to cooperative dynamics. The decay time was a weak, nonmonotonic function of salt concentration and decreased with increasing temperature, in an Arrhenius fashion. In contrast, the shear modulus decreased with increasing salt concentration and increasing temperature. The entanglement relaxation from rheological measurements followed Vogel−Fulcher−Tammann behavior. The structural decay time was slower than the entanglement relaxation time at temperatures above the glass transition temperature, but they were approximately equal at T g regardless of salt concentration. This may indicate a fundamental connection between cooperative structural motion and polymer chain motion in this material.

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Section: Discussionsupporting

confidence: 91%

Structural Dynamics of Strongly Segregated Block Copolymer Electrolytes

et al. 2018

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“…Lee and Crist13 reported the phase behavior of PEO/NaSCN mixtures, which showed a eutectic point. Fauteux and coworkers14–16 extensively studied the phase behaviors of binary solid polymer electrolyte (SPE) systems such as PEO/LiX [X = CF 3 SO

_{3}^{−}

, ClO

_{4}^{−}

, AsF

_{6}^{−}

, N(CF 3 SO 2 )

_{2}^{−}

, or C(CF 3 SO 3 )

_{3}^{−}

] and PEO/NaI.…”

Section: Introductionmentioning

confidence: 99%

Phase behaviors of hyperbranched solid polymer electrolyte/salt systems: The structure effect

Bae

Kong

et al. 2004

J Polym Sci B Polym Phys

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We have derived a new molecular thermodynamic model based on the lattice cluster model and melting point depression theory to account for the structural effect on phase behaviors of hyperbranched solid polymer electrolyte/salt systems. The two structural parameters (the generation number and separator length) are introduced to characterize the architecture of the hyperbranched polymer. A thermooptical analysis technique is used to determine the melting points of hyperbranched polymer/ZnI2 systems. Our results show that the eutectic point is presented at a higher weight fraction of the salt as the generation number increases. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 2254–2262, 2004

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“…Lee and Crist13 reported phase behaviors of PEO/NaSCN mixtures, which show eutectic points. Robitaille and coworkers14–16 extensively investigated the phase behaviors of binary SPE systems such as PEO/LiX [X = CF 3 SO

_{−}^{3}

, ClO

_{−}^{4}

, AsF

_{−}^{6}

, N(CF 3 SO 2 )

_{−}^{2}

, C(CF 3 SO 3 )

_{−}^{3}

] and PEO/NaI.…”

Section: Introductionmentioning

confidence: 99%

Effect of compression on the solid polymer electrolytes: The modified lattice‐fluid model

Ahn

Bae

2002

J Polym Sci B Polym Phys

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A molecular thermodynamic model based on the theory of melting point depression, the Adam-Gibbs configurational entropy model, and the modified latticefluid model was developed to interpret ionic conductivities of solid polymer electrolytes with various pressures. A new configurational entropy, S was introduced in this model. Quantitative descriptions according to the proposed model agreed with the experimental data for the given systems. Our results showed that a eutectic point moves toward higher melting temperatures, whereas a lower weight fraction of salt and the ionic conductivity significantly decrease with pressure.

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Thermal behavior of new polymer electrolytes

Cited by 20 publications

References 3 publications

Structural Dynamics of Strongly Segregated Block Copolymer Electrolytes

Structural Dynamics of Strongly Segregated Block Copolymer Electrolytes

Phase behaviors of hyperbranched solid polymer electrolyte/salt systems: The structure effect

Effect of compression on the solid polymer electrolytes: The modified lattice‐fluid model

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