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Organic Negative Electrode Materials For Li-ion and Na-ion Batteries
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström. (Structural Chemistry)
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala: Kph Trycksaksbolaget AB , 2015. , 43 p.
Keyword [en]
organic materials, Li-ion batteries, Na-ion batteries
National Category
Chemical Sciences
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-243273OAI: oai:DiVA.org:uu-243273DiVA: diva2:786838
Presentation
2015-02-27, Beurlingrummet, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2015-02-11 Created: 2015-02-06 Last updated: 2015-02-11Bibliographically approved
List of papers
1. Optimizing the electrochemical performance of water-soluble organic Li-ion battery electrodes
Open this publication in new window or tab >>Optimizing the electrochemical performance of water-soluble organic Li-ion battery electrodes
2013 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 34, 174-176 p.Article in journal (Refereed) Published
Abstract [en]

A method for improving the electrode formulation of organic Li-ion battery active materials is reported here. By combining freeze-drying and carbon-coating in the liquid state, an improved morphology of the electrode and the material can be achieved. The carbon content proved to be vital for the electrochemical performance due to its high dispersion when the active material particle size decreases. Reasonable capacity (>150 mAh/g) was shown for dilithium benzenediacrylate at 2C during 50 cycles. 

Keyword
Lithium-ion batteries, Organic electrodes, Electrode formulation, Freeze-drying
National Category
Natural Sciences
Identifiers
urn:nbn:se:uu:diva-210245 (URN)10.1016/j.elecom.2013.06.008 (DOI)000324963900044 ()
Available from: 2013-11-05 Created: 2013-11-04 Last updated: 2017-12-06Bibliographically approved
2. Stability of organic Na-ion battery electrode materials: The case of disodium pyromellitic diimidate
Open this publication in new window or tab >>Stability of organic Na-ion battery electrode materials: The case of disodium pyromellitic diimidate
2014 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 45, 52-55 p.Article in journal (Refereed) Published
Abstract [en]

A novel organic Na-salt is presented here for utilization as an active electrode material in rechargeable Na-ion batteries. The compound, disodium pyromellitic diimidate, is synthesized through a reaction by pyromellitic acid and sodium hydride and characterized using H-1-NMR. Na-batteries of the organic compound were able to obtain capacity values close to the theoretical during the first cycles, but a steady capacity decrease could be observed during cycling. The battery nevertheless delivered a capacity of ca 90 mAh/g after 100 cycles, rendering it a comparatively competitive organic Na-battery material. However, the results stress the importance of tailoring Na-compounds with a good chemical stability also at high levels of sodiation, since decomposition side-reactions can be probable. 

Keyword
Na-ion batteries, Organic electrode materials, N-cyclic structures, Pyromellitic diimidate
National Category
Chemical Sciences
Identifiers
urn:nbn:se:uu:diva-230068 (URN)10.1016/j.elecom.2014.05.012 (DOI)000339035700013 ()
Available from: 2014-09-03 Created: 2014-08-19 Last updated: 2017-12-05Bibliographically approved
3. Benzenediacrylates as organic battery electrode materials: Na versus Li
Open this publication in new window or tab >>Benzenediacrylates as organic battery electrode materials: Na versus Li
2014 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, no 72, 38004-38011 p.Article in journal (Refereed) Published
Abstract [en]

This paper discusses investigations of a novel Na-based organic battery electrode material, disodium benzenediacrylate (Na(2)BDA) in comparison with its Li-ion homologue. Li(2)BDA has previously shown promising battery properties, such as stable cycling and good capacity retention. Na(2)BDA and Li(2)BDA are here successfully synthesized and characterized, and investigated as anode materials in prototype Na- and Li-ion battery cells. Moreover, different electrolytes are screened for the Na-battery material, and a useful operating voltage window is explored. Na(2)BDA is shown to possess a higher initial coulombic efficiency (91%) than the Li-homologue, which is uncommon for sodiated organic electrode materials. The Na-compound shows an initial capacity of 177.7 mA h g(-1), which however decreases to ca. 50 mA h g(-1) after 20-100 cycles depending on the cycling rate; a significantly lower capacity retention then that observed for Li(2)BDA. The capacity loss can primarily be explained by a decomposition mechanism of the Na(2)BDA compound.

National Category
Chemical Sciences
Identifiers
urn:nbn:se:uu:diva-233622 (URN)10.1039/c4ra06288d (DOI)000341455200008 ()
Available from: 2014-10-07 Created: 2014-10-07 Last updated: 2017-12-05

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