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Electronic changes in poly(3,4-ethylenedioxythiophene)-coated LiFeSO4F during electrochemical lithium extraction
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.
Univ Kent, Sch Phys Sci, Canterbury CT2 7NH, Kent, England.
Scania CV AB, SE-15187 Sodertalje, Sweden.
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2019 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 418, p. 84-89Article in journal (Refereed) Published
Abstract [en]

The redox activity of tavorite LiFeSO4F coated with poly (3,4-ethylenedioxythiophene), i.e. PEDOT, is investigated by means of several spectroscopic techniques. The electronic changes and iron-ligand redox features of this LiFeSO4F-PEDOT composite are probed upon delithiation through X-ray absorption spectroscopy. The PEDOT coating, which is necessary here to obtain enough electrical conductivity for the electrochemical reactions of LiFeSO4F to occur, is electrochemically stable within the voltage window employed for cell cycling. Although the electronic configuration of PEDOT shows also some changes in correspondence of its reduced and oxidized forms after electrochemical conditioning in Li half-cells, its p-type doping is fully retained between 2.7 and 4.1 V with respect to Li+/Li during the first few cycles. An increased iron-ligand interaction is observed in LixFeSO4F during electrochemical lithium extraction, which appears to be a general trend for polyanionic insertion compounds. This finding is crucial for a deeper understanding of a series of oxidation phenomena in Li-ion battery cathode materials and helps paving the way to the exploration of new energy storage materials with improved electrochemical performances.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2019. Vol. 418, p. 84-89
Keywords [en]
Li-ion batteries, Lithium iron sulphate fluoride, Tavorite structure, X-ray absorption spectroscopy, Conductive polymers, Anionic redox processes
National Category
Materials Chemistry Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-381567DOI: 10.1016/j.jpowsour.2019.02.039ISI: 000462420500010OAI: oai:DiVA.org:uu-381567DiVA, id: diva2:1305195
Funder
Swedish Foundation for Strategic Research Swedish Research Council Formas, 245-2014-668Swedish Energy Agency, 2017-013531StandUpÅForsk (Ångpanneföreningen's Foundation for Research and Development)Available from: 2019-04-16 Created: 2019-04-16 Last updated: 2019-04-16Bibliographically approved

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Blidberg, AndreasValvo, MarioGustafsson, TorbjörnBjörefors, Fredrik

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