Polydioxolane Polymer Electrolyte

Foos, J. S.; Erker, S. M.

doi:10.1149/1.2100743

Cited by 12 publications

(16 citation statements)

References 1 publication

(3 reference statements)

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“…Results obtained from these techniques were found to be consistent with what has been reported in the literature, with an observed shift in the carbon and hydrogen NMR peaks and the appearance of additional carbon-hydrogen FTIR stretches (see Figure B and Supporting Information). ,− …”

Section: Results and Discussionmentioning

confidence: 99%

“…Poly-DOL formed by LiPF 6 shows differences compared to the analogous material produced via other initiators such as LiAsF 6 or Al(OTf) 3 . For example, in a study by Foos and Erker, 2.5 M LiAsF 6 with trace amounts of dichlorodicyano benzoquinone in DOL formed an optically clear, rubbery material, indicative of low levels or even no crystallinity. The molecular weights revealed by GPC (<100 kDa) are nonetheless consistent with poly-DOL formed using other salts to initiate polymerization DOL. ,,, …”

Section: Results and Discussionmentioning

confidence: 99%

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Synthesis and Properties of Poly-Ether/Ethylene Carbonate Electrolytes with High Oxidative Stability

Khan

Zhao

et al. 2019

Chem. Mater.

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New electrolyte designs are necessary for overcoming multiple challenges posed by emerging lithiummetal battery chemistries. Task-specific viscoelastic electrolytes are specifically required that are capable of simultaneously sustaining reversible electrochemistry at the Li metal anode, maintaining high oxidative stability at the battery cathode and achieving high room-temperature ionic conductivity in the electrolyte bulk. Here, we synthesize and study a series of polymeric electrolytes composed of poly-1,3dioxolane (poly-DOL) networks formed by ring-opening polymerization of 1,3-dioxolane/ethylene carbonate (EC) mixtures by a commonly used LiPF 6 electrolyte salt. The complex kinetics of the DOL polymerization reaction in EC results in nonlinear phase behavior, including the appearance of a critical transition to an entangled, solid-like electrolyte state at 40% DOL. The transition is mediated by a range of physicochemical regimesfrom liquid-like solutions to highly viscous conducting gels. We show that poly-DOL/EC electrolytes with a high concentration of the DOL precursor exhibit improved electrochemical stability compared to conventional DOL-based electrolytes, while maintaining good room temperature ionic conductivity. We show further that the EC component imparts oxidative stability, enabling their use in rechargeable, roomtemperature Li||LiNi 0.6 Co 0.2 Mn 0.2 O 2 electrochemical cells.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Synthesis and Properties of Poly-Ether/Ethylene Carbonate Electrolytes with High Oxidative Stability

Khan

Zhao

et al. 2019

Chem. Mater.

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“…This has prompted many researchers to attempt to modify the properties of PEO. [8][9][10][11][12][13][14][15][16][17][18][19] In the mid 1980s poly[bis(2-(2′-methoxyethoxy)ethoxy)-phosphazene], MEEP (4), was first synthesized and studied as a polymer electrolyte by Shriver, Allcock, and their co-workers. 20,21 This polymer is amorphous over a temperature range from at least -100 to 100°C in the presence of dissolved LiSO 3 CF 3 or AgSO 3 CF 3 and was found to show room temperature conductivities of up to 3 orders of magnitude higher than PEO.…”

Section: Introductionmentioning

confidence: 99%

Polyphosphazenes Bearing Branched and Linear Oligoethyleneoxy Side Groups as Solid Solvents for Ionic Conduction

et al. 1996

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A new series of solid polymer electrolyte materials based on the poly(organophosphazene) system has been designed and synthesized. The new polymers contain linear or branched oligoethyleneoxy side chains. The polymers were characterized by 31 P, 13 C, and 1 H-NMR spectroscopy, gel permeation chromatography, differential scanning calorimetry, and elemental analysis. The ambient temperature (25°C) ionic conductivities of the polymers complexed with lithium triflate were measured by complex impedance analysis. The polymers that bear linear oligoethyleneoxy side chains [NP{O(CH2CH2O)n-CH3}2], have low glass transition temperatures that range from -84 to -75°C. These polymers have properties that are similar to those of the classical counterpart poly[bis(2-(2-methoxyethoxy)ethoxy)-phosphazene. They have low dimensional stabilities and undergo viscous flow even at room temperature. The polymers with branched oligoethyleneoxy side chains (podands) have similar glass transition temperatures, in the range of -82 to -79°C. However, the bulk dimensional stabilities of the branched polymers are significantly higher than those of the corresponding linear side chain series. The branched side chain polymers resist viscous flow and readily form thin, free-standing films. The podand polymers also dissolve lithium triflate to form ionically conducting materials with conductivity levels similar to those of the polymers bearing linear side chains.

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“…The polymerization of dioxolane occurs only in the presence of LiAsF6, with increasing concentrations of the salt facilitating the reaction. 17 This lends further evidence that AsF8 is an integral component in the electropolymerization reaction. Except for very high concentrations of salt (ca.…”

Section: Discussionmentioning

confidence: 60%

The Anodic Behavior of Iron in Anhydrous Dimethoxyethane and Passivation by Solvent Electropolymerization

Scanlon

Krüger

Moran

1993

J. Electrochem. Soc.

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The corrosion and passivity of high purity iron in anhydrous dimethoxyethane with 0.5M LiAsF6 have been studied by various electrochemical and surface analytical techniques. The motivations for this study were twofold; (i) to develop an understanding of the passivity of metals and alloys in anhydrous organic solutions at a fundamental level, and (it) to apply what is learned to improve the performance and useful life of high energy density lithium batteries which employ organic solvents. The data show that iron displays a stable passive region with low current densities over a large range of anodic potentials. Several different passivation mechanisms have been identified in this stable region. Among these mechanisms is passivation by solvent chemisorption. Our key finding is the observation of passivation by electropolymerization of the dimethoxyethane solvent. The polymerization reaction has not been observed when electrolytes other than LiAsF~ are used. Consequently, the potential at which breakdown of passivity occurs is lower in solutions containing alternative electrolytes. In addition, a bare oxide-free metal surface appears necessary for initiation of the electropolymerization reaction. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 129.173.72.87 Downloaded on 2015-06-22 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 129.173.72.87 Downloaded on 2015-06-22 to IP

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Polydioxolane Polymer Electrolyte

Abstract: not Available.

Cited by 12 publications

References 1 publication

Synthesis and Properties of Poly-Ether/Ethylene Carbonate Electrolytes with High Oxidative Stability

Synthesis and Properties of Poly-Ether/Ethylene Carbonate Electrolytes with High Oxidative Stability

Polyphosphazenes Bearing Branched and Linear Oligoethyleneoxy Side Groups as Solid Solvents for Ionic Conduction

The Anodic Behavior of Iron in Anhydrous Dimethoxyethane and Passivation by Solvent Electropolymerization

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