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A study of poly(vinyl alcohol) as a solid polymer electrolyte for lithium-ion batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
2016 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The use of solid polymer electrolytes in lithium-ion batteries has the advantage in

terms of safety and processability, however they often lack in terms of performance.

This is of major concern in applications where high current densities or rapidly

changing currents are important. Such applications include electrical vehicles and

energy storage of the electrical grid to accommodate fluctuations when using

renewable energy sources such as wind and solar.

In this study, the use of commercial poly(vinyl alcohol) (PVA) as a solid polymer

electrolyte for use in lithium-ion batteries has been evaluated. Films were prepared

using various lithium salts such as lithium bis(trifluoromethane)sulfonimide (LiTFSI)

and casting techniques. Solvent free films were produced by substituting the solvent

Dimethyl sulfoxide (DMSO) with water and rigouros drying or by employing a

hot-pressing technique. The best performing system studied was PVA-LiTFSI-DMSO,

which reached ionic conductivities of 4.5E-5 S/cm at room temperature and 0.45

mS/cm at 60 °C. The solvent free films showed a drop of ionic conductivity by

roughly one order of magnitude compared to films with residual DMSO present. High

ionic conductivities in PVA-LiTFSI-DMSO electrolytes are thus ascribed to fast lithium

ion transport through the liquid domain of DMSO, or by plasticizing effects of salt and

solvent on the polymer.

Thermal analysis of the films showed a clear plasticizing effect of DMSO by a decrease

in the glass transition temperature. FTIR analysis showed complexation of all the

lithium salts investigated with the OH-groups of the polymer by a shift in the

characteristic frequencies of both salts and polymer.

For the first time, prototype battery cells containing PVA electrolytes were

manufactured and evaluated by galvanostatic cycling. PVA-LiTFSI-DMSO showed

stable cycling performance for 15 cycles. Solvent free electrolytes were also

investigated but did not result in any stable cycling performance.

Place, publisher, year, edition, pages
2016.
Series
UPTEC K, ISSN 1650-8297 ; 16013
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-319268OAI: oai:DiVA.org:uu-319268DiVA, id: diva2:1086444
Educational program
Master Programme in Chemical Engineering
Supervisors
Examiners
Available from: 2017-04-05 Created: 2017-04-03 Last updated: 2017-04-05Bibliographically approved

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