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Characterization of PEDOT-Quinone conducting redox polymers in water-in-salt electrolytes for safe and high-energy Li-ion batteries
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. Department of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 165-8555, Japan.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och funktionella material)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. (Nanoteknologi och funktionella material)ORCID iD: 0000-0002-4726-4121
Department of Applied Chemistry, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 165-8555, Japan; Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 165-8555, Japan.
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2019 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 105, article id 106489Article in journal (Refereed) Published
Abstract [en]

Li-ion batteries (LIBs) raise safety and environmental concerns, which mostly arise from their toxic and flammable electrolytes and the extraction of limited material resources by mining. Recently, water-in-salt electrolytes (WiSEs), in which a large amount of lithium salt is dissolved in water, have been proposed to allow for assembling safe and high-voltage (>3.0 V) aqueous LIBs. In addition, organic materials derived from abundant building blocks and their tunable properties could provide safe and sustainable replacements for inorganic cathode materials. In the current work, the electrochemical properties of a conducting redox polymer based on poly(3,4-ethylenedioxythiophene) (PEDOT) with hydroquinone (HQ) pendant groups have been characterized in WiSEs. The quinone redox reaction occurs within the potential region where the polymer is conducting, and fast redox conversion that involves lithium cycling during pendant group redox conversion was observed. These properties make conducting redox polymers promising candidates as cathode-active materials for safe and high-energy aqueous LIBs. An organic-based aqueous LIB, with a HQ-PEDOT as a cathode, Li4Ti5O12 (LTO) as an anode, and ca. 15 m lithium bis(trifluoromethanesulfonyl)imide water/dimethyl carbonate (DMC) as electrolyte, yielded an output voltage of 1.35 V and high rate capabilities up to 500C.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 105, article id 106489
Keywords [en]
Conducting redox polymer, Organic electronics, Renewable energy storage, Lithium ion battery, Water-in-salt electrolyte, Quinone
National Category
Nano Technology Materials Chemistry
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
URN: urn:nbn:se:uu:diva-389513DOI: 10.1016/j.elecom.2019.106489ISI: 000484833800003OAI: oai:DiVA.org:uu-389513DiVA, id: diva2:1337728
Funder
Carl Tryggers foundation Swedish Research CouncilSwedish Research Council FormasSweGRIDS - Swedish Centre for Smart Grids and Energy StorageAvailable from: 2019-07-16 Created: 2019-07-16 Last updated: 2019-10-17Bibliographically approved

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