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Sökning: WFRF:(Østli Elise R.)

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1.
  • Østli, Elise R. R., et al. (författare)
  • Stabilizing the Cathode Interphase of LNMO using an Ionic-liquid based Electrolyte
  • 2023
  • Ingår i: Batteries & Supercaps. - : John Wiley & Sons. - 2566-6223. ; 6:7
  • Tidskriftsartikel (refereegranskat)abstract
    • The ionic liquid (IL)-based electrolyte comprising 1.2 M lithium bis(fluorosulfonyl)imide (LiFSI) in N-propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (PYR13FSI) (ILE) has been evaluated as a suitable system for the high-voltage cathode material LiNi0.5-xMn1.5+xO4 (LNMO) when cycled vs. graphite anodes. The oxidative stability of the ILE was evaluated by linear sweep voltammetry (LSV) and synthetic charge-discharge profile voltammetry (SCPV) and was found to exceed that of state-of-the-art 1 M LiPF6 in 1 : 1 ethylene carbonate (EC) : diethylcarbonate (DEC) (LP40). Improved cycling performance both at 20 degrees C and 45 degrees C was found for LNMO||graphite full cells with the IL electrolyte. X-ray photoelectron spectroscopy (XPS) analysis showed that robust and predominantly inorganic surface layers were formed on the LNMO cathode using the ILE, which stabilized the electrode. Although the high viscosity of the ILE limits the rate performance at 20 degrees C, this ILE is a promising alternative electrolyte for use in lithium-ion batteries (LiBs) with high-voltage cathodes such as LNMO, especially for use at elevated temperatures.
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2.
  • Østli, Elise R., et al. (författare)
  • On the Durability of Protective Titania Coatings on High‐Voltage Spinel Cathodes
  • 2022
  • Ingår i: ChemSusChem. - : John Wiley & Sons. - 1864-5631 .- 1864-564X. ; 15:12
  • Tidskriftsartikel (refereegranskat)abstract
    • TiO2-coating of LiNi0.5-xMn1.5+xO4 (LNMO) by atomic layer deposition (ALD) has been studied as a strategy to stabilize the cathode/electrolyte interface and mitigate transition metal (TM) ion dissolution. The TiO2 coatings were found to be uniform, with thicknesses estimated to 0.2, 0.3, and 0.6 nm for the LNMO powders exposed to 5, 10, and 20 ALD cycles, respectively. While electrochemical characterization in half-cells revealed little to no improvement in the capacity retention neither at 20 nor at 50 °C, improved capacity retention and coulombic efficiencies were demonstrated for the TiO2-coated LNMO in LNMO||graphite full-cells at 20 °C. This improvement in cycling stability could partly be attributed to thinner cathode electrolyte interphase on the TiO2-coated samples. Additionally, energy-dispersive X-ray spectroscopy revealed a thinner solid electrolyte interphase on the graphite electrode cycled against TiO2-coated LNMO, indicating retardation of TM dissolution by the TiO2-coating.
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