32 / 2021-06-28 09:49:26

Preparation and electrochemical investigation of TiO2/MoS2 composite film anode by two-step

Plasma electrolytic oxidation,magnetron sputtering,lithium ion battery,anode

In this paper, a sphere-like MoS₂ doped TiO₂ film was prepared on Ti foil by plasma electrolytic oxidation and magnetron sputtering methods. The prepared film was assembled as a binder-free anode in the lithium-ion battery. A Li foil served as the counter electrode and a copper foil was the collector. The specific capacity and cycling stability of the electrode were evaluated, together with the cyclic voltammograms and electrochemical impedance spectra. The TiO₂/MoS₂ composite film anode combined with the high structural stability of TiO₂ and high theoretical capacity of MoS₂ played a synergistic and enhanced effect. The electrochemical performance exhibited a specific capacity above 400 mAh g^-1 at the current density of 100 µA cm^-2, which was much higher than that of the TiO₂ anode. Besides, after cycling under a high current density of 1000 μA cm^-2, the capacity came back to 91% of the initial capacity, showing a good rate capability. The porous TiO₂ prepared by plasma electrolytic oxidation can provide a significant number of internal channels for the Li⁺ diffusion, resulting in a high porosity of 33.5% - 41.6%, and a high Li⁺ diffusion coefficient of 3.12×10^-14 - 6.67×10^-14 cm²/s, which was beneficial for the enhanced electrochemical performance.