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Title: Counterion Effects on Ion Mobility and Mobile Ion Concentration of Doped Polyphosphazenes and Polyphosphazene Ionomers.

Abstract

Abstract not provided.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1266957
Report Number(s):
SAND2007-1173C
526682
DOE Contract Number:
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: Proposed for presentation at the American Physical Society Annual March Conference held March 5-9, 2007 in Denver, CO.
Country of Publication:
United States
Language:
English

Citation Formats

Welna, Daniel, Klein, Robert, Weikel, Arlin, Allcock, Harry, Colby, Ralph, and Runt, James. Counterion Effects on Ion Mobility and Mobile Ion Concentration of Doped Polyphosphazenes and Polyphosphazene Ionomers.. United States: N. p., 2007. Web.
Welna, Daniel, Klein, Robert, Weikel, Arlin, Allcock, Harry, Colby, Ralph, & Runt, James. Counterion Effects on Ion Mobility and Mobile Ion Concentration of Doped Polyphosphazenes and Polyphosphazene Ionomers.. United States.
Welna, Daniel, Klein, Robert, Weikel, Arlin, Allcock, Harry, Colby, Ralph, and Runt, James. Thu . "Counterion Effects on Ion Mobility and Mobile Ion Concentration of Doped Polyphosphazenes and Polyphosphazene Ionomers.". United States. doi:. https://www.osti.gov/servlets/purl/1266957.
@article{osti_1266957,
title = {Counterion Effects on Ion Mobility and Mobile Ion Concentration of Doped Polyphosphazenes and Polyphosphazene Ionomers.},
author = {Welna, Daniel and Klein, Robert and Weikel, Arlin and Allcock, Harry and Colby, Ralph and Runt, James},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}

Conference:
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  • Comprehensive investigation of lithium ion complexation with 15N-labeled polyphosphazenes- 15N-poly[bis(2-(2-methoxyethoxy)ethoxy)phosphazene] (15N-MEEP) and 15N-poly-[((2-allylphenoxy)0.12(4-methoxyphenoxy)1.02(2-(2-methoxyethoxy)ethoxy)0.86)phosphazene] (15N-HPP)-was performed by NMR, IR, and Raman spectroscopies. Previous studies characterized the ionic transport through the polymer matrix in terms of "jumps" between neighboring polymer strands utilizing the electron lone pairs of the etherial oxygen nuclei with the nitrogen nuclei on the polyphosphazene backbone not involved. However, noteworthy changes were observed in the NMR, IR, and Raman spectra with the addition of lithium trifluoromethanesulfonate (LiOTf) to the polyphosphazenes. The data indicate that the preferred association for the lithium ion with the polymer is with the nitrogen nuclei,more » resulting in the formation of a "pocket" with the pendant groups folding around the backbone. NMR temperature-dependent spin-lattice relaxation (T1) studies (13C, 31P, and 15N) indicate significant lithium ion interaction with the backbone nitrogen nuclei. These studies are in agreement with molecular dynamics simulations investigating lithium ion movement within the polyphosphazene matrix.« less
  • Abstract not provided.
  • Measurements are reported in which the induced carrier concentration and Hall mobility of p-channel MOS structures are determined as a function of surface potential by Hall effect measurements at two different temperatures. The ratio of the Hall mobility to conductivity mobility was also determined. The density of interface states within 6 kT of the valence band edge was calculated. The density of those states generally decreased with ionizing radiation dose and the channel carrier mobility was found to decrease with irradiation at low surface potentials. At high surface potentials, channel carrier mobility was relatively insensitive to ionizing radiation. Carrier scatteringmore » mechanisms within the conducting channel are discussed.« less
  • Nanocomposites of poly(bis-(2(2-methoxyethoxy)ethoxy)phosphazene) (MEEP) or cryptand[2.2.2] with the aluminosilicate Na-montmorillonite (NaMont) were studied to develop new solid electrolytes with high conductivity and a unity cation transport number. An aluminosilicate was chosen because the low basicity of the Si-O-Al framework should minimize ion pairing. To further reduce ion pairing, solvating molecules or polymers such as cryptand[2.2.2] or MEEP were introduced into the aluminosilicate. When compared to pristine Na-montmorillonite, impedance spectroscopy indicates an increase in conductivity of up to 100 for MEEP{center_dot}NaMont intercalates, and of 50 for cryptand[2.2.2]{center_dot}NaMont intercalates. The MEEP{center_dot}NaMont intercalate exhibits high ionic conductivity anisotropy with respect to the montmorillonitemore » layers ({sigma}{sub para.}/{sigma}{sub perp.} = 100), which is consistent with increased tortuosity of the cation diffusion path perpendicular to the structure layers. The temperature dependence of the conductivity suggests that cation transport is coupled to segmental motion of the intercalated polymer, as observed previously for simple polymer-salt complexes. Nanocomposites of solvating polymers or molecules with aluminosilicates provide a promising new direction in solid-state electrolytes.« less
  • We report a systematic study of the transport properties and the underlying physical chemistry of some polyphosphazene (PPhz)-based polymer electrolytes. We synthesized MEEP and variants which employed mixed combinations of different length oxyethylene side-chains. We compare the conductivity and ion-ion interactions in polymer electrolytes obtained with lithium triflate and lithium bis(trifluoromethanesulfonyl)imide (TFSI) salts added to the polymer. The combination of the lithium imide salt and MEEP yields a maximum conductivity of 8 x 10{sup -5} {Omega}{sup -1} cm{sup -1} at room temperature at a salt loading of 8 monomers per lithium. In one of the mixed side-chain variations, a maximummore » conductivity of 2 x 10{sup -4} {Omega}{sup -1} cm{sup -1} was measured at the same molar ratio. Raman spectral analysis shows some ion aggregation and some polymer - ion interactions in the PPhz-LiTFSI case but much less than observed with Li CF{sub 3}SO{sub 3}. A sharp increase in the Tg as salt is added corresponds to concentrations above which the conductivity significantly decreases and ion associations appear.« less