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Effect of Lithium Salt Content on the Performance of Thermoset Lithium Battery Electrolytes
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), Fibre and Polymer Technology, Coating Technology.ORCID iD: 0000-0003-3201-5138
2012 (English)In: American Chemical Society Symposium Series (ACS), ISSN 0097-6156, E-ISSN 1947-5918, 55-65 p.Article in journal (Refereed) Published
Abstract [en]

Series of solid poly(ethylene glycol)-methacrylate electrolytes have successfully been manufactured in a solvent free process with an aim to serve in a multifunctional battery, both as mechanical load carrier as well as lithium ion conductor. The electrolytes have been studied with respect to mechanical and electrical properties. The thermoset series differs with respect to crosslink density and glass transition temperature (Tg). The results show that the conductivity increases, with salt content exhibiting similar trends, although at overall levels that differ if measured above or below the Tg of the system. The Tg transition on the other hand is more affected by the salt content for loosely crosslinked thermosets. The coordination of a lithium salt to the PEG-segments play a more important role for the physical state of the material when there are less restrictions due to crosslinking of the PEG-chains. The overall performance of the electrolyte at different temperatures will thus be more affected.

Place, publisher, year, edition, pages
2012. 55-65 p.
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-107279DOI: 10.1021/bk-2012-1096.ch004Scopus ID: 2-s2.0-84905577275OAI: oai:DiVA.org:kth-107279DiVA: diva2:575460
Note

QC 20121210

Available from: 2012-12-10 Created: 2012-12-10 Last updated: 2017-12-07Bibliographically 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
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 36 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2012:61
National Category
Other Chemistry Topics
Identifiers
urn:nbn:se:kth:diva-107182 (URN)978-91-7501-546-0 (ISBN)
Presentation
2012-12-07, K2, Teknikringen 28, KTH, Stockholm, 13:00 (Swedish)
Opponent
Supervisors
Note

QC 20121207

Available from: 2012-12-07 Created: 2012-12-07 Last updated: 2012-12-10Bibliographically approved
2. 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.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2014:7
National Category
Polymer Chemistry
Identifiers
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)
Opponent
Supervisors
Funder
Swedish Foundation for Strategic Research , RMA08-0002Swedish Energy Agency, 37712-1
Note

QC 20140410

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

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Johansson, Mats

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