ALD Al₂O₃-Coated TiO₂Nanotube Layers as Anodes for Lithium-Ion Batteries

This is the authors' abstract. We don't add key points for this paper.

High Resolution Image Download MS PowerPoint Slide The utilization of the anodic TiO 2 nanotube layers, with uniform Al 2 O 3 coatings of different thicknesses (prepared by atomic layer deposition, ALD), as the new electrode material for lithium-ion batteries (LIBs), is reported herein. Electrodes with very thin Al 2 O 3 coatings (∼1 nm) show a superior electrochemical performance for use in LIBs compared to that of the uncoated TiO 2 nanotube layers. A more than 2 times higher areal capacity is received on these coated TiO 2 nanotube layers (∼75 vs 200 μAh/cm 2 ) as well as higher rate capability and coulombic efficiency of the charging and discharging reactions. Reasons for this can be attributed to an increased mechanical stability of the TiO 2 nanotube layers upon Al 2 O 3 coating, as well as to an enhanced diffusion of the Li + ions within the coated nanotube layers. In contrast, thicker ALD Al 2 O 3 coatings result in a blocking of the electrode surface and therefore an areal capacity decrease.