TiO2 Nanotube Layers Decorated with Al2O3/MoS2/Al2O3 as Anode for Li-ion Microbatteries with Enhanced Cycling Stability

Alexander Teklit Tesfaye; Hanna Sopha; Angela Ayobi; Raul Zazpe; Jhonatan Rodriguez-Pereira; Jan Michalicka; Ludek Hromadko; Siowwoon Ng; Zdenek Spotz; Jan Prikryl; Jan M Macak; Thierry Djenizian

doi:10.3390/nano10050953

TiO₂ Nanotube Layers Decorated with Al₂O₃/MoS₂/Al₂O₃ as Anode for Li-ion Microbatteries with Enhanced Cycling Stability

Nanomaterials (Basel). 2020 May 17;10(5):953. doi: 10.3390/nano10050953.

Authors

Alexander Teklit Tesfaye¹, Hanna Sopha^{2

3}, Angela Ayobi¹, Raul Zazpe^{2

3}, Jhonatan Rodriguez-Pereira², Jan Michalicka³, Ludek Hromadko^{2

3}, Siowwoon Ng³, Zdenek Spotz³, Jan Prikryl², Jan M Macak^{2

3}, Thierry Djenizian^{1

4}

Affiliations

¹ Mines Saint-Etienne, Center of Microelectronics in Provence, Flexible Electronics Department, 13541 Gardanne, France.
² Center of Materials and Nanotechnologies, Faculty of Chemical Technology, University of Pardubice, Nam. Cs. Legii 565, 53002 Pardubice, Czech Republic.
³ Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic.
⁴ Al-Farabi Kazakh National University, Center of Physical-Chemical Methods of Research and Analysis, 96A. Tole bi str., 050012 Almaty, Kazakhstan.

Abstract

TiO₂ nanotube layers (TNTs) decorated with Al₂O₃/MoS₂/Al₂O₃ are investigated as a negative electrode for 3D Li-ion microbatteries. Homogenous nanosheets decoration of MoS₂, sandwiched between Al₂O₃ coatings within self-supporting TNTs was carried out using atomic layer deposition (ALD) process. The structure, morphology, and electrochemical performance of the Al₂O₃/MoS₂/Al₂O₃-decorated TNTs were studied using scanning transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and chronopotentiometry. Al₂O₃/MoS₂/Al₂O₃-decorated TNTs deliver an areal capacity almost three times higher than that obtained for MoS₂-decorated TNTs and as-prepared TNTs after 100 cycles at 1C. Moreover, stable and high discharge capacity (414 µAh cm^-2) has been obtained after 200 cycles even at very fast kinetics (3C).

Keywords: Al2O3; Li-ion microbatteries; MoS2; TiO2 nanotube; atomic layer deposition.