TY  - JOUR
AU  - Mathies, Lena
AU  - Diddens, Diddo
AU  - Dong, Dengpan
AU  - Bedrov, Dmitry
AU  - Leipner, Hartmut
TI  - Transport mechanism of lithium ions in non-coordinating P(VdF-HFP) copolymer matrix
JO  - Solid state ionics
VL  - 357
SN  - 0167-2738
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2022-00397
SP  - 115497 -
PY  - 2020
AB  - 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 α- to γ-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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000591907000020
DO  - DOI:10.1016/j.ssi.2020.115497
UR  - https://juser.fz-juelich.de/record/905105
ER  -