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Optimizing the electrochemical performance of water-soluble organic Li-ion battery electrodes
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.
2013 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 34, p. 174-176Article 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. 

Place, publisher, year, edition, pages
2013. Vol. 34, p. 174-176
Keyword [en]
Lithium-ion batteries, Organic electrodes, Electrode formulation, Freeze-drying
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-210245DOI: 10.1016/j.elecom.2013.06.008ISI: 000324963900044OAI: oai:DiVA.org:uu-210245DiVA, id: diva2:661940
Available from: 2013-11-05 Created: 2013-11-04 Last updated: 2018-04-04Bibliographically approved
In thesis
1. Organic Negative Electrode Materials For Li-ion and Na-ion Batteries
Open this publication in new window or tab >>Organic Negative Electrode Materials For Li-ion and Na-ion Batteries
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala: Kph Trycksaksbolaget AB, 2015. p. 43
Keyword
organic materials, Li-ion batteries, Na-ion batteries
National Category
Chemical Sciences
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-243273 (URN)
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
2. Building Sustainable Batteries: Organic electrodes based on Li- and Na-benzenediacrylate
Open this publication in new window or tab >>Building Sustainable Batteries: Organic electrodes based on Li- and Na-benzenediacrylate
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

As possible alternatives to the conventional inorganic Li- or Na-ion battery electrode materials, organic compounds have recently drawn considerable attention. However, major challenges such as poor electronic conductivity, solubility in battery electrolyte or fast capacity decay of the resulting electrochemical cells are some of the reasons that hold these compounds back from becoming commercial solutions in the energy system.

The goal of this thesis work was to investigate the background to these phenomena and find strategies for improvements. Two different compounds were studied: dilithium and disodium benzenediacrylate, in their respective cells. First, improving the performance of the dilithium compound was performed by applying different electrode fabrication strategies. A freeze-drying technique was combined with carbon coating in the liquid state, which rendered an improved electrode morphology. Moreover, when using the compound in pouch cell format instead of Swagelok® cells, a different technique was applied: calendaring. Successful results were obtained both in half-cells and in full-cells when the compound was cycled versus LiFePO4-based cathodes. Second, the sodium analogue was investigated, and while the synthesis of this compound is straightforward, the electrochemical performance in Na-ion battery cells displays an unexpected degree of complexity. The compound displays a considerably faster capacity decrease in comparison to the Li compound, and generally a poor chemical stability in the applied system. When cycled at higher currents (C-rates of C/4 or C/10, in comparison to C/40), the compound presents an capacity increase while the Li decreases, likely due to a chemical process more dependent on time than on the number of cycles for the Na compound.

The fast capacity decay in the first cycles of these types of compounds is often considered to be related to the Solid Electrolyte Interphase (SEI) layer formation. Its study was also performed and it was concluded that the Na compound has a thicker SEI layer in comparison to the Li counterpart, and mostly consisted of inorganic species such as the electrolyte salt and its decomposition products. Finally, a concept for a sustainable manufacturing and recycling process of a hybrid full cell is also performed with positive results.

Although the organic compounds cannot yet outperform the inorganic compounds used commercially in Li-ion batteries, important steps towards their employment in the energy system have been taken in this thesis work.    

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 65
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1658
Keyword
Organic Electrode Materials, Li-ion Batteries, Na-ion Batteries, Calendaring, Recycling Process
National Category
Natural Sciences
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-347404 (URN)978-91-513-0303-1 (ISBN)
Public defence
2018-05-25, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2018-05-04 Created: 2018-04-04 Last updated: 2018-05-04

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