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Mechanical Stabilization of Solid Polymer Electrolytes through Gamma Irradiation
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
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2016 (English)Conference paper, Poster (with or without abstract) (Refereed)
Description
Abstract [en]

Recent research efforts into solid polymer electrolytes (SPEs) beyond the polyether paradigm have broadened the research field with new materials that offer improvements in performance as well as opportunities for tailoring materials for specific applications. In particular materials based on polycarbonates and polyesters have shown to fulfil this promise, as shown for systems based on both the poly(ethylene carbonate) [1,2] and the poly(trimethylene carbonate) [3,4] backbone structures. This has ultimately led to the development of SPEs that can be used in Li batteries operational at room temperature. [1,4]

 

Since ion conduction in these materials – at least at moderate salt concentrations – is coupled to the polymer chain dynamics, the performance of these electrolytes is inherently a compromise between mechanics and ion dynamics. While this is not necessarily an issue at room temperature, it becomes notable at elevated temperatures and we have observed migration of the electrolyte during long-term battery operation under such conditions, ultimately leading to failure of the electrolyte membrane to act as a separator between the electrodes with concomitant battery failure.

 

A solution to this is to chemically crosslink the material in order to stabilize it mechanically. For the poly(ε-caprolactone-co-trimethylene carbonate) host material we have already successfully used in high-performance Li battery cells, [4] this can be done through γ-irradiation. [5] Here, we have explored this treatment in the context of SPEs and show the effects of γ-irradiation on the mechanical properties, ionic conductivity and battery cell performance at room temperature and beyond.

 

 

Figure 1. Viscoelastic properties (left) and ionic conductivity (right) of pristine and γ-irradiated SPEs.

 

References

[1] K. Kimura, M. Yajima, Y. Tominaga, Electrochem. Commun. 66 (2016) 46-48.

[2] M. D. Konieczynska, X. Lin, H. Zhang, M. W. Grinstaff, ACS Macro Lett. 4 (2015) 533-537.

[3] J. Mindemark, B. Sun, D. Brandell, Polym. Chem. 6 (2015) 4766-4774.

[4] J. Mindemark, B. Sun, E. Törmä, D. Brandell, J. Power Sources 298 (2015) 166-170.

[5]                        E. Bat, J. A. Plantinga, M. C. Harmsen, M. J. A. van Luyn, Z. Zhang, D. W. Grijpma, J. Feijen, Biomacromolecules 9 (2008) 3208–3215

Place, publisher, year, edition, pages
2016.
National Category
Materials Chemistry Polymer Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-336929OAI: oai:DiVA.org:uu-336929DiVA, id: diva2:1167570
Conference
15th International Symposium on Polymer Electrolytes
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2018-01-03

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