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Conducting Redox Polymer Based Anode Materials for High Power Electrical Energy Storage
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Organic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Organic Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.ORCID iD: 0000-0002-5496-9664
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2016 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 204, p. 270-275Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

In this report we present the synthesis and characterization of two conducting redox polymers (CRPs) with polythiophene backbone and diethyl terephthalate pendant groups for the use as anode materials in secondary batteries. The materials show excellent rate capability allowing 301,Lm layers to be fully converted within seconds without the use of conductive additives. The high rate capability is traced to the open morphology of the materials that allows for fast ion transport, and to the mediation of electrons through the conducting polymer (CP) backbone. The requirements for the latter are i) that the redox chemistry of the pendant groups and the CP backbone overlaps and ii) that the CP conductivity is not compromised by the presence of the pendant groups. In the CRPs presented herein both these requirements are met and this is thus the first report on successful combination of the redox chemistry of organic redox molecules with the n-doping of conducting polymers.

Place, publisher, year, edition, pages
2016. Vol. 204, p. 270-275
Keyword [en]
conducting redox polymers, terephthalates, polythiophene, n-doping
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-298055DOI: 10.1016/j.electacta.2016.03.163ISI: 000376136700031OAI: oai:DiVA.org:uu-298055DiVA: diva2:946477
Funder
Swedish Foundation for Strategic Research Swedish Research CouncilCarl Tryggers foundation Stiftelsen Olle Engkvist ByggmästareSwedish Energy AgencyEU, Horizon 2020, 644631
Available from: 2016-07-05 Created: 2016-06-29 Last updated: 2017-11-28Bibliographically approved
In thesis
1. Terephthalate-Functionalized Conducting Redox Polymers for Energy Storage Applications
Open this publication in new window or tab >>Terephthalate-Functionalized Conducting Redox Polymers for Energy Storage Applications
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Organic electrode materials, as sustainable and environmental benign alternatives to inorganic electrode materials, show great promise for achieving cheap, light, versatile and disposable devices for electrical energy storage applications. Conducting redox polymers (CRPs) are a new class of organic electrode materials where the charge storage capacity is provided by the redox chemistry of functional pendent groups and electronic conductivity is provided by the doped conducting polymer backbone, enabling the production of energy storage devices with high charge storage capacity and high power capability. This pendant-conducting polymer backbone combination can solve two of the main problems associated with organic molecule-based electrode materials, i.e. the dissolution of the active material and the sluggish charge transport within the material. In this thesis, diethyl terephthalate and polythiophenes were utilized as the pendant and the backbone, respectively. The choice of pendant-conducting polymer backbone combination was based on potential match between the two moieties, i.e. the redox reaction of terephthalate pendent groups and the n-doping of polythiophene backbone occur in the same potential region. The resulting CRPs exhibited fast charge transport within the polymer films and low activation energies involved charge propagation through these materials. In the design of these CRPs an unconjugated link between the pendant and the backbone was found to be advantageous in terms of the polymerizability of the monomers and for the preservation of individual redox activity of the pendants and the polymer chain in CRPs. The functionalized materials were specifically designed as anode materials for energy storage applications and, although insufficient cycling stability was observed, the work presented in this thesis demonstrates that the combination of redox active functional groups with conducting polymers, forming CRPs, shows promise for the development of organic matter-based electrical energy storage materials.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. p. 60
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1437
Keyword
conducting polymers, terephthalate, polythiophene, PEDOT, conductance
National Category
Nano Technology
Identifiers
urn:nbn:se:uu:diva-304628 (URN)978-91-554-9715-6 (ISBN)
Public defence
2016-11-24, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:30 (English)
Opponent
Supervisors
Available from: 2016-11-08 Created: 2016-10-06 Last updated: 2016-11-16
2. Conducting Redox Polymers for Electrode Materials: Synthetic Strategies and Electrochemical Properties
Open this publication in new window or tab >>Conducting Redox Polymers for Electrode Materials: Synthetic Strategies and Electrochemical Properties
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Organic electrode materials represent an intriguing alternative to their inorganic counterparts due to their sustainable and environmental-friendly properties. Their plastic character allows for the realization of light-weight, versatile and disposable devices for energy storage. Conducting redox polymers (CRPs) are one type of the organic electrode materials involved, which consist of a π-conjugated polymer backbone and covalently attached redox units, the so-called pendant. The polymer backbone can provide conductivity while it is oxidized or reduced (i. e., p- or n-doped) and the concurrent redox chemistry of the pendant provides charge capacity. The combination of these two components enables CRPs to provide both high charge capacity and high power capability. This dyad polymeric framework provides a solution to the two main problems associated with organic electrode materials based on small molecules: the dissolution of the active material in the electrolyte, and the sluggish charge transport within the material. This thesis introduces a general synthetic strategy to obtain the monomeric CRPs building blocks, followed by electrochemical polymerization to afford the active CRPs material. The choice of pendant and of polymer backbone depends on the potential match between these two components, i.e. the redox reaction of the pendant and the doping of backbone occurring within the same potential region. In the thesis, terephthalate and polythiophene were selected as the pendant and polymer backbone respectively, to get access to low potential CRPs. It was found that the presence of a non-conjugated linker between polymer backbone and pendant is essential for the polymerizability of the monomers as well as for the preservation of individual redox activities. The resulting CRPs exhibited fast charge transport within the polymer film and low activation barriers for charge propagation. These low potential CRPs were designed as the anode materials for energy storage applications. The combination of redox active pendant as charge carrier and a conductive polymer backbone reveals new insights into the requirements of organic matter based electrical energy storage materials.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. p. 83
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1604
Keyword
Organic electrode material, Energy storage, Conducting redox polymer, Polythiophene, Terephthalate, PEDOT
National Category
Nano Technology Organic Chemistry Physical Chemistry Polymer Chemistry
Research subject
Chemistry with specialization in Organic Chemistry
Identifiers
urn:nbn:se:uu:diva-334562 (URN)978-91-513-0168-6 (ISBN)
Public defence
2018-01-19, B41, BMC, Husargatan, Uppsala, 09:15 (English)
Opponent
Supervisors
Funder
SweGRIDS - Swedish Centre for Smart Grids and Energy StorageSwedish Research CouncilSwedish Foundation for Strategic Research
Available from: 2017-12-21 Created: 2017-11-23 Last updated: 2017-12-21

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Yang, LiHuang, XiaoGogoll, AdolfStrömme, MariaSjödin, Martin

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