In this work we show that the use of two ceramic additives can enhance the high-rate capability (up to 20 A/g – 120C) of nanoparticulate anatase formed by thermal treatment of protonated TiO2 nanotubes. We show systematically that use of RuO2 as an electron-conductive material and silica as a suppressant of particle growth improve the high-rate performance of anatase by 25-55 mA h/g at 60 C. The combined use of both additives in a total amount of merely 2.5 wt.% leads to an improvement of more than 70 mA h/g at 60C. The underlying mechanisms for these significant effects are briefly discussed.
COBISS.SI-ID: 3903258
In this work we estimate how various interphase contacts affect the electrode kinetics in lithium ion batteries. We apply variable external mechanical pressure onto different cathodes and measure their impedance response. Similar experiments are performed on dry composites in contact with: Al or Cu foil, or Ag paste. Most surprisingly, we find that the high-frequency impedance arc is due to the contact impedance between the metal and the electrode material. This is in fundamental contradiction with previous interpretations. We propose an equivalent circuit explaining the observed phenomena.
COBISS.SI-ID: 3983642