Physical properties of Li ion conducting polyphosphazene based polymer electrolytes

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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 maximum ... continued below

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10 p.

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Sanderson, S.; Zawodzinski, T.; Hermes, R.; Davey, J. & Dai, Hongli December 31, 1996.

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Description

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 maximum 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.

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10 p.

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OSTI as DE97002365

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  • 190. meeting of the Electrochemical Society and technical exhibition, San Antonio, TX (United States), 6-11 Oct 1996

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  • Other: DE97002365
  • Report No.: LA-UR--96-3874
  • Report No.: CONF-961040--16
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 431164
  • Archival Resource Key: ark:/67531/metadc683593

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 26, 2016, 3:15 p.m.

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Sanderson, S.; Zawodzinski, T.; Hermes, R.; Davey, J. & Dai, Hongli. Physical properties of Li ion conducting polyphosphazene based polymer electrolytes, article, December 31, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc683593/: accessed January 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.