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New structural lithium battery electrolytes using thiol-ene chemistry
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.ORCID iD: 0000-0001-9203-9313
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology.ORCID iD: 0000-0003-3201-5138
2013 (English)In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 236, 22-29 p.Article in journal (Refereed) Published
Abstract [en]

A series of solid poly(ethylene oxide)-methacrylate lithium ion electrolytes containing thio-ether segments have successfully been produced and evaluated with respect to mechanical and electrical performance. The series have been varied in crosslink density and thio-ether content. The study presents thiol-ene compounds as yet another tool to design multifunctional electrolytes, and that they are compatible with and usable for polymer electrolyte systems. The electrolytes, produced in a solvent free process where the oligomers are active diluents of the lithium salt, express a broad range of both mechanical as well as ion conducting properties. Conductivity values presented ranges up to about 8 x 10(-7) S/cm, and a wide spectrum of values of the storage modulus is presented in a range from 2 MPa to 2 GPa at 20 degrees C. The influence of the crosslink density of the poly(ethylene oxide)-methacrylates with and without thio-ether segments is discussed. In order to present correlations between crosslink density and how the lithium ion transport is affected by incorporating multifunctional thiol monomers, density measurements have been undertaken to calculate the average molar mass between the crosslinks.

Place, publisher, year, edition, pages
2013. Vol. 236, 22-29 p.
Keyword [en]
Solid polymer electrolyte (SPE), Mechanical properties, Ionic conductivity, Structural batteries, Thiol-ene chemistry, Multi-functionality
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-122347DOI: 10.1016/j.ssi.2013.01.019ISI: 000317453700005ScopusID: 2-s2.0-84874924405OAI: diva2:622281
Swedish Foundation for Strategic Research , RMA08-0002

QC 20130521

Available from: 2013-05-21 Created: 2013-05-20 Last updated: 2014-06-23Bibliographically approved
In thesis
1. Solid Polymer Lithium-Ion Conducting Electrolytes for Structural Batteries
Open this publication in new window or tab >>Solid Polymer Lithium-Ion Conducting Electrolytes for Structural Batteries
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This work comprises the manufacture and characterization of solid polymer lithium ion conducting electrolytes for structural batteries. In the study, polymer films are produced in situ via a rapid versatile UV irradiation polymerization route, in which ethylene oxide methacrylates are polymerized into thermoset networks. In the first part of the study, the simplicity and efficiency of this manufacturing route is emphasized. Polymer electrolytes are pro-duced with an ionic conductivity ranging from 5.8×10-10 S cm-1 up to 1.5×10-6 S cm-1, and a storage modulus of up to 2 GPa at 20°C. In the sec-ond part, the effect of the lithium salt content is studied, both for tightly crosslinked systems with a glass transition temperature (Tg) above room temperature but also for sparsely crosslinked system with a Tg below. It is shown that for these systems, there is a threshold amount of 4% lithium salt by weight, above which the ion conducting ability is not affected to a larger extent when the salt content is increased further. It is also shown that the influence of the salt content on the ionic conductivity is similar within both systems. However, the Tg is more affected by the addition of lithium salt for the loosely crosslinked system, and since the Tg is the main affecting parame-ter of the conductivity, the salt content plays a larger role here. In the third part of the study, a thiol functional compound is added via thiol-ene chemistry to create thio-ether segments in the polymer network. This is done in order to expand the toolbox of possible building blocks usable in the design of structural electrolytes. It is shown that solid polymer electrolytes of more homogeneous networks with a narrower glass transition region can be produced this way, and that they have the ability to function as an electrolyte. Finally, the abilities of reinforcing the electrolytes by nano fibrilar cellulose are investigated, by means to improve the mechanical properties without decreasing the ionic conductivity at any larger extent. These composites show conductivity values close to 10-4 S cm-1 and a storage modulus around 400 MPa at 25 °C.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. 70 p.
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:7
National Category
Polymer Chemistry
urn:nbn:se:kth:diva-144169 (URN)978-91-7595-035-8 (ISBN)
Public defence
2014-04-25, F3, Lindstedtsvägen 26, KTH, Stockholm, 14:00 (English)
Swedish Foundation for Strategic Research , RMA08-0002Swedish Energy Agency, 37712-1

QC 20140410

Available from: 2014-04-10 Created: 2014-04-10 Last updated: 2014-04-10Bibliographically approved

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Willgert, MarkusHellqvist Kjell, MariaLindbergh, GöranJohansson, Mats
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