Ion conduction of branched polyethyleneimine-lithium bis(trifluoromethylsulfonyl) imide electrolytes
2011 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 57, 201-206 p.Article in journal (Refereed) Published
Ionic conductivity of polymer electrolytes containing branched poly (ethylene imine) (BPEI) and lithium bis(trifluoromethyl sulfonyl)imide (LiTFSI) was measured between temperatures of 20 and 70◦C and molar ratios of 20:1 and 400:1. The electrolytes were characterized by impedance spectroscopy, differential scanning calorimetry, and viscosity measurements. At room temperature, the maximum conductivity was 2×10−6 S/cm at a molar ratio of 50:1. The molar conductivity of the electrolytes displayed first a minimum and then a maximum upon increasing salt concentration. A proportionality of molar conductivity to segmental mobility was seen from glass transition temperature and viscosity measurements. Analysis of the Walden product and isoviscosity conductivity showed that the percentage of ions bound in ion pairs increased at low concentrations below 0.1 mol/kg. The average dipole moment decreased with salt concentration. The temperature dependence of the ionic conductivity showed an Arrhenius behavior.
Place, publisher, year, edition, pages
2011. Vol. 57, 201-206 p.
Ionic conductivity, Poly (ethylene imine), Arrhenius behavior, Walden rule, Ion pairing
Other Materials Engineering
Research subject Chemistry with specialization in Polymer Chemistry; Engineering Science with specialization in Solid State Physics
IdentifiersURN: urn:nbn:se:uu:diva-163443DOI: 10.1016/j.electacta.2011.04.040ISI: 000298463900029OAI: oai:DiVA.org:uu-163443DiVA: diva2:463955