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Sökning: WFRF:(Wieczorek Wladyslaw)

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2.
  • Jankowski, Piotr, 1990, et al. (författare)
  • Functional ionic liquids: Cationic SEI-formers for lithium batteries
  • 2019
  • Ingår i: Energy Storage Materials. - : Elsevier BV. - 2405-8297. ; 20, s. 108-117
  • Tidskriftsartikel (refereegranskat)abstract
    • More stable electrolytes for lithium-ion batteries are urgently needed, and apart from general improvements in thermal and electrochemical stabilities, both stability, safety and performance are connected with the formation of the solid electrolyte interphase (SEI) layer at the negative electrode. A high performant SEI-layer; thin, uniform, highly ion conducting, etc., is difficult to achieve and proper control of its formation process is therefore highly desirable. The idea presented here is based on computational screening of a wide range of modifications of wellknown ionic liquid (IL) cations towards better ability to form SEI-layers - i.e. acting as SEI-formers. Different cation chemistries and kinds of structural modifications were tested, with introduction of nitrile groups and/or double bonds resulting to be the most promising. The latter is outlined as especially beneficial, as apart from enabling an easier initiation reaction it provides a site for polymerization, resulting in polymeric SEI-products poly (IL) s (PILs), which can be expected to provide both protection of the electrode surface and fast Li thorn transport.
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3.
  • Szczesna-Chrzan, Anna, et al. (författare)
  • Systematic Studies on Liquid Sodium 4,5-dicyano-2-(trifluoromethyl)imidazolate (NaTDI)-Based Electrolytes and Its Impact on the Cycling Behaviour Against Wet Impregnated WI-NaNMC and Prussian White Cathodes
  • 2022
  • Ingår i: Advanced Materials Interfaces. - : John Wiley & Sons. - 2196-7350. ; 9:8
  • Tidskriftsartikel (refereegranskat)abstract
    • The article describes a research on new salts and cathode materials dedicated to sodium cells. Sodium technology is considered to be one of the most promising (for new battery generations) and has been very actively (re)-developed for more than a decade. The first part of this work is mainly focused on electrochemical studies of the low coordinating Huckel type salt (4,5-dicyano-2-(trifluoromethyl)imidazolate, NaTDI)-based electrolytes with and without solid electrolyte interface modified additives: fluoroethylene carbonate (FEC). In the second part electrolytes are tested in a half-cells with layered oxides. Sodium nickel-manganese-cobalt oxide (NaNMC) and WI-NaNMC-333 and WI-NaNMC-622 layered cathode materials are prepared by wet impregnation synthesis (WI) routine. Prussian White is obtained from University of Uppsala group to compare and initial electrochemical properties against electrolyte with NaTDI. Basic physicochemical properties of the obtained powders are also reported in the manuscript. The best properties are recorded for 0.75 m NaTDI in EC:DMC (1:1 v/v) with 3% FEC additive by its conductivity (11.52 mS cm(-1) for 20 degrees C). The same solution also shows promising results during electrochemical tests in half-cell geometry against WI-NaNMC-622 cathode (114.22 mAh g(-1) after 1 cycle C/20). NaPF6 salt is used as an electrolyte as a commercially available reference.
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