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Hedman, Jonas
Publications (5 of 5) Show all publications
Hedman, J., Morát, J., Johansson, D., Langhammer, E. & Björefors, F. (2018). Nanoplasmonics for online monitoring of lithium-ion batteries. In: : . Paper presented at 69th Annual Meeting of the International Society of Electrochemistry, 2-7 September 2018, Bologna, Italy..
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2018 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Materials Chemistry
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-374730 (URN)
Conference
69th Annual Meeting of the International Society of Electrochemistry, 2-7 September 2018, Bologna, Italy.
Available from: 2019-01-23 Created: 2019-01-23 Last updated: 2019-01-23
Liu, C., Carboni, M., Brant, W., Pan, R., Hedman, J., Zhu, J., . . . Younesi, R. (2018). On the Stability of NaO2 in Na–O2 Batteries. ACS Applied Materials and Interfaces, 10(16), 13534-13541
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 16, p. 13534-13541Article in journal (Refereed) Published
Abstract [en]

Na–O2 batteries are regarded as promising candidates for energy storage. They have higher energy efficiency, rate capability, and chemical reversibility than Li–O2 batteries; in addition, sodium is cheaper and more abundant compared to lithium. However, inconsistent observations and instability of discharge products have inhibited the understanding of the working mechanism of this technology. In this work, we have investigated a number of factors that influence the stability of the discharge products. By means of in operando powder X-ray diffraction study, the influence of oxygen, sodium anode, salt, solvent, and carbon cathode were investigated. The Na metal anode and an ether-based solvent are the main factors that lead to the instability and decomposition of NaO2 in the cell environment. This fundamental insight brings new information on the working mechanism of Na–O2 batteries.

Keywords
metal-air battery, in operando X-ray diffraction, sodium superoxide, NaO2, decomposition
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-356097 (URN)10.1021/acsami.8b01516 (DOI)000431150900032 ()29616791 (PubMedID)
Funder
Swedish Research CouncilSwedish Energy AgencyStandUpÅForsk (Ångpanneföreningen's Foundation for Research and Development)
Available from: 2018-07-19 Created: 2018-07-19 Last updated: 2018-10-05Bibliographically approved
Bergfelt, A., Lacey, M. J., Hedman, J., Sångeland, C., Brandell, D. & Bowden, T. (2018). ε-Caprolactone-based solid polymer electrolytes for lithium-ion batteries: synthesis, electrochemical characterization and mechanical stabilization by block copolymerization. RSC Advances, 8(30), 16716-16725
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2018 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 8, no 30, p. 16716-16725Article in journal (Refereed) Published
Abstract [en]

In this work, three types of polymers based on epsilon-caprolactone have been synthesized: poly(epsilon-caprolactone), polystyrene-poly(epsilon-caprolactone), and polystyrene-poly(epsilon-caprolactone-r-trimethylene carbonate) (SCT), where the polystyrene block was introduced to improve the electrochemical and mechanical performance of the material. Solid polymer electrolytes (SPEs) were produced by blending the polymers with 10-40 wt% lithium bis(trifluoromethane) sulfonimide (LiTFSI). Battery devices were thereafter constructed to evaluate the cycling performance. The best performing battery half-cell utilized an SPE consisting of SCT and 17 wt% LiTFSI as both binder and electrolyte; a Li vertical bar SPE vertical bar LiFePO4 cell that cycled at 40 degrees C gave a discharge capacity of about 140 mA h g(-1) at C/5 for 100 cycles, which was superior to the other investigated electrolytes. Dynamic mechanical analysis (DMA) showed that the storage modulus E' was about 5 MPa for this electrolyte.

National Category
Polymer Chemistry
Identifiers
urn:nbn:se:uu:diva-340854 (URN)10.1039/c8ra00377g (DOI)000431814500034 ()
Funder
Swedish Energy Agency, 42031-1EU, Horizon 2020, 685716
Available from: 2018-02-04 Created: 2018-02-04 Last updated: 2018-08-27Bibliographically approved
Liu, C., Carboni, M., Brant, W. R., Pan, R., Hedman, J., Zhu, J., . . . Younesi, R. (2017). Insights into the Stability of Discharge Products in Na-O2 Batteries.
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2017 (English)Other (Other academic)
Keywords
Materials Chemistry, Materialkemi
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-338358 (URN)
Note

2018-01-08T14:32:53.090+01:00

Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-07-19
Liu, C., Carboni, M., Brant, W., Pan, R., Hedman, J., Zhu, J.-F., . . . Younesi, R.Insights into the Stability of Discharge Products in Na-O2 Batteries.
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(English)Manuscript (preprint) (Other academic)
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-330776 (URN)
Projects
Na-air batteries
Available from: 2017-10-03 Created: 2017-10-03 Last updated: 2018-07-19Bibliographically approved
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