Interdisziplinäres Zentrum für Materialwissenschaften
  Publikationen [suche]   
Organisation
Aktivitäten
Kontakt
Angebote für Studenten
Bereiche im
      Nanotechnikum
Martin-Luther-Universität
Interdisziplinäres Zentrum für Materialwissenschaften
Nanotechnikum Weinberg
Heinrich-Damerow-Str. 4,
D-06120 Halle, Germany
Tel.: +49 345 55 28471
Telefax:+49 345 55 27390 email: info@cmat.uni-halle.de
[Veröffentlichungen] [Graduierungsarbeiten] [Berichte] [Poster]
Abstracts

LENA MATHIES, DIDDO DIDDENS, DENGPAN DONG, DMITRY BEDROV, HARTMUT LEIPNER
Transport mechanism of lithium ions in non-coordinating P(VdF-HFP) copolymer matrix
Solid State Ionics 357 (2020),

Polymer films based on poly(vinylidene difluoride-co-hexafluoropropylene) (P(VdF-HFP)) with different amounts of bis(trifluoromethane)sulfonimide lithium salt (LiTfSI) were prepared from acetone solution in a doctor blade casting machine under controlled and reproducible drying conditions. The modification of the copolymer-based layers show a significant enhancement of conductivity over several orders of magnitude for increasing LiTfSI content and a constantly low electronic conductivity. The addition of salt results in a structural change of the crystalline areas in the semi-crystalline copolymer matrix from ?- to ?-phase of P(VdF), which has been studied using Raman spectroscopy and X-Ray diffraction. Lithium ions are coordinated by oxygen atoms of TfSI? as verified by Raman spectroscopy and molecular dynamics simulations. Based on the experimental data and simulation results, we propose a transport mechanism for the lithium ions through salt channels in the amorphous regions of the non-coordinating copolymer matrix via hopping between stabilized positions.

Keywords: Polymer electrolyteLiTfSIP(VdF-HFP)Transport mechanismMD simulation

DOI10.1016/j.ssi.2020.115497


Impressum Copyright © Center of Materials Science, Halle, Germany. All rights reserved.