Influence of Water on Poly(propylene glycol)- Lithium Triflate Electrolytes, Studied by Impedance and Infrared Spectroscopy

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dc.contributor.authorOlander, Erik
dc.contributor.departmentChalmers tekniska högskola / Institutionen för fysiksv
dc.contributor.examinerMellander, Bengt-Erik
dc.date.accessioned2019-09-13T11:23:56Z
dc.date.available2019-09-13T11:23:56Z
dc.date.issued2019sv
dc.date.submitted2019
dc.description.abstractIn this thesis, Poly(propylene glycol)4000-LiCF3SO3-water electrolytes were studied with thermogravimetry, impedance and infrared spectroscopy. A method for drying the compounds and adding water was developed success- fully. Among the samples without water, the medium concentration 0.63 mol/kg LiCF3SO3 (LiTf) had the highest conductivity of 2.9 10−4 S/m. Water increased the conductivity for all samples. The conductivity increased the most for the high concentration 2.7 mol/kg LiTf sample, from 8.4 10−6 S/m dry to 1.5 10−2 S/m wet. Water in PPG4000 above saturation sepa- rates into a wet polymer phase and an aqueous phase, but LiTf enables more water to be mixed into the electrolyte without phase separation. The limited molecular interaction between PPG4000 chain and water explains the phase separation. The PPG4000 hydrophilic OH endgroups can explain the ability to form emulsion with water. The SO3 1041 cm−1 and 1031 cm−1 symmetric stretch IR bands show that OH and Li+ compete in interacting with SO3. The ion pair dissociation could explain part of the conductivity increase with added water.sv
dc.identifier.coursecodeTIFX05sv
dc.identifier.urihttps://hdl.handle.net/20.500.12380/300292
dc.language.isoengsv
dc.setspec.uppsokPhysicsChemistryMaths
dc.subjectPolymer electrolytessv
dc.subjectImpedance Spectroscopysv
dc.subjectConductivitysv
dc.subjectPermittivitysv
dc.subjectFTIR Infrared Spectroscopysv
dc.subjectLithium Triflate LiCF3SO3sv
dc.subjectPoly(propylene glycol) PPG PPG4000sv
dc.subjectPoly(propylene glycol)-Water Mixturessv
dc.subjectPoly(propylene glycol)-Lithium Triflate electrolytessv
dc.subjectPoly(propylene glycol)-Lithium Triflate-Water Mixturessv
dc.subjectMacrophase and Microphase Separationsv
dc.subjectPhase Separationsv
dc.subjectIon Pairssv
dc.subjectAqueous electrolytessv
dc.titleInfluence of Water on Poly(propylene glycol)- Lithium Triflate Electrolytes, Studied by Impedance and Infrared Spectroscopysv
dc.type.degreeExamensarbete för masterexamensv
dc.type.uppsokH
local.programmePhysics and astronomy (MPPAS), MSc
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