ALD Al<sub>2</sub>O<sub>3</sub>‑Coated TiO<sub>2</sub> Nanotube Layers as Anodes for Lithium-Ion Batteries

Published on 2017-06-16T17:52:10Z (GMT) by
The utilization of the anodic TiO<sub>2</sub> nanotube layers, with uniform Al<sub>2</sub>O<sub>3</sub> 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<sub>2</sub>O<sub>3</sub> coatings (∼1 nm) show a superior electrochemical performance for use in LIBs compared to that of the uncoated TiO<sub>2</sub> nanotube layers. A more than 2 times higher areal capacity is received on these coated TiO<sub>2</sub> nanotube layers (∼75 vs 200 μAh/cm<sup>2</sup>) 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<sub>2</sub> nanotube layers upon Al<sub>2</sub>O<sub>3</sub> coating, as well as to an enhanced diffusion of the Li<sup>+</sup> ions within the coated nanotube layers. In contrast, thicker ALD Al<sub>2</sub>O<sub>3</sub> coatings result in a blocking of the electrode surface and therefore an areal capacity decrease.

Cite this collection

Sopha, Hanna; Salian, Girish D.; Zazpe, Raul; Prikryl, Jan; Hromadko, Ludek; Djenizian, Thierry; Macak, Jan M. (2017): ALD Al2O3‑Coated TiO2 Nanotube

Layers as Anodes for Lithium-Ion Batteries. ACS Publications.

https://doi.org/10.1021/acsomega.7b00463

Retrieved: 17:52, Aug 21, 2017 (GMT)