Self-supported sulphurized TiO2 nanotube layers as positive electrodes for lithium microbatteries

Girish Salian (1) , Milos Krbal (2) , Hanna Sopha (2, 3, 4) , Chrystelle Lebouin (5) , Marie-Vanessa Coulet (5) , Jan Michalicka (3, 4) , Ludek Hromadko (2) , Alexander Tesfaye (6) , Jan Macak (2, 3, 4) , Thierry Djenizian (6)

1 FEL-ENSMSE - Département d’Électronique Flexible
2 CEMNAT - Center of Materials and Nanotechnologies [University of Pardubice]
3 CEITEC MU - Central European Institute of Technology [Brno]
4 BUT - Brno University of Technology [Brno]
5 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie
6 CMP-ENSMSE - Centre Microélectronique de Provence - Site Georges Charpak (CMP-GC)

We report the synthesis and characterization of self-supported sulphurized TiO 2 nanotube layers as a cathode material for Li microbatteries. Sulphurized TiO 2 nanotubes were obtained by annealing of selfsupported TiO 2 nanotubes in sulphur atmosphere. The morphology, structure, composition and thermal stability of the Ti x O y S z nanotube layers were studied by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and thermogravimetric analysis. The electrochemical behaviors of the chemically modified nanotubes were investigated by cyclic voltammetry and chronopotentiometry techniques. This nanostructured electrode used as a cathode material showed high rate capabilities even at very fast kinetics. Remarkably, a high discharge capacity (340 Ah cm −2) has been retrieved after 100 cycles with 100% coulombic efficiency attesting the excellent stability of the electrode.

Domaines: Matériaux

Girish Salian, Milos Krbal, Hanna Sopha, Chrystelle Lebouin, Marie-Vanessa Coulet, et al.. Self-supported sulphurized TiO2 nanotube layers as positive electrodes for lithium microbatteries. Applied Materials Today, 2019, 16, pp.257-264. ⟨10.1016/j.apmt.2019.05.015⟩. ⟨hal-02323068⟩