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Träfflista för sökning "WFRF:(Matic Aleksandar 1968) srt2:(2020-2021);pers:(Lindberg Simon 1987)"

Sökning: WFRF:(Matic Aleksandar 1968) > (2020-2021) > Lindberg Simon 1987

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1.
  • Calcagno, Giulio, 1990, et al. (författare)
  • Fast charging negative electrodes based on anatase titanium dioxide beads for highly stable Li-ion capacitors
  • 2020
  • Ingår i: Materials Today Energy. - : Elsevier BV. - 2468-6069. ; 16
  • Tidskriftsartikel (refereegranskat)abstract
    • Hybrid energy storage systems aim to achieve both high power and energy densities by combining supercapacitor-type and battery-type electrodes in tandem. The challenge is to find sustainable materials as fast charging negative electrodes, which are characterized by high capacity retention. In this study, mesoporous anatase beads are synthetized with tailored morphology to exploit fast surface redox reactions. The TiO2-based electrodes are properly paired with a commercial activated carbon cathode to form a Li-ion capacitor. The titania electrode exhibits high capacity and rate performance. The device shows extremely stable performance with an energy density of 27 mWh g-1 at a specific current of 2.5 A g−1 for 10,000 cycles. The remarkable stability is associated with a gradual shift of the potential during cycling as result of the formation of cubic LiTiO2 on the surface of the beads. This phenomenon renews the interest in using TiO2 as negative electrode for Li-ion capacitors.
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2.
  • Lindberg, Simon, 1987, et al. (författare)
  • Charge storage mechanism of α-MnO2 in protic and aprotic ionic liquid electrolytes
  • 2020
  • Ingår i: Journal of Power Sources. - : Elsevier BV. - 0378-7753 .- 1873-2755. ; 460
  • Tidskriftsartikel (refereegranskat)abstract
    • In this work we have investigated the charge storage mechanism of MnO2 electrodes in ionic liquid electrolytes. We show that by using an ionic liquid with a cation that has the ability to form hydrogen bonds with the active material (MnO2) on the surface of the electrode, a clear faradaic contribution is obtained. This situation is found for ionic liquids with cations that have a low pKa, i.e. protic ionic liquids. For a protic ionic liquid, the specific capacity at low scan rate rates can be explained by a densely packed layer of cations that are in a standing geometry, with a proton directly interacting through a hydrogen bond with the surface of the active material in the electrode. In contrast, for aprotic ionic liquids there is no interaction and only a double layer contribution to the charge storage is observed. However, by adding an alkali salt to the aprotic ionic liquid, a faradaic contribution is obtained from the insertion of Li+ into the surface of the MnO2 electrode. No effect can be observed when Li+ is added to the protic IL, suggesting that a densely packed cation layer in this case prevent Li-ions from reaching the active material surface.
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