This readme file was generated on [november 2023] by [José García Antón (Principal Investigator)] ___________________ GENERAL INFORMATION ___________________ Title of Dataset: Preparation of electrodes based on WO3 nanostructures for Li-ion batteries The data are related with the preparation of electrodes based on WO3 nanostructures used as anode materials for Li-ion batteries Author/Principal Investigator Information Name: José García Antón ORCID: https://orcid.org/0000-0002-0289-1324 Institution: Universitat Politècnica de València Address: Camino de Vera s/n Email: jgarciaa@iqn.upv.es Author/Associate or Co-investigator Information Name: Gemma Roselló Márquez ORCID:https://orcid.org/0000-0002-3116-1312 Institution: Universitat Politècnica de València Address: Camino de Vera s/n Email: gemromar@etsii.upv.es Author/Associate or Co-investigator Information Name: Dionisio M. García García ORCID:https://orcid.org/0000-0001-8951-4558 Institution: Universitat Politècnica de València Address: Camino de Vera s/n Email: diogarg1@iqn.upv.es Author/Associate or Co-investigator Information Name: Mireia Cifre Herrando ORCID:https://orcid.org/0000-0002-8800-3585 Institution: Universitat Politècnica de València Address: Camino de Vera s/n Email: mcifher@upvnet.upv.es Author/Associate or Co-investigator Information Name: Encarna Blasco Tamarit ORCID:https://orcid.org/0000-0001-7314-082X Institution: Universitat Politècnica de València Address: Camino de Vera s/n Email: meblasco@iqn.upv.es Date of data collection: 2022 Geographic location of data collection: Valencia, Spain Keywords: charge/discharge curves, electrochemical properties, Li-ion batteries, WO3 nanostructures Information about funding sources that supported the collection of the data: AEI (PID2019-105844RB-I00/AEI/10.13039/501100011033) project. Project co-funded by the FEDER operational program 2014–2020 of the Comunitat Valenciana (IDIFEDER/18/044) __________________________ SHARING/ACCESS INFORMATION __________________________ Licenses/restrictions placed on the data: COPYRIGHT Links to publications that cite or use the data: https://doi.org/10.1111/jace.18910 Journal of the American Ceramic Society 2023;106:2550–2566 (OPEN ACCESS) ______________________ DATA & FILE OVERVIEW ______________________ File List: - Li+ ion diffusion coefficients: obtained from the slope of Randles circuits - Charge-discharge cycles: The range potential between the charge and discharge tests that have been carried out was 0.01–4 V versus Li/Li+ at a current density of 100 mA g−1. - Cycle voltammograms curves: The cyclic voltammogram (CV) measurements were performed at a scan rate of 0.5mV s−1 of between 0.01 and 4.0 V. - EIS tests: Electrochemical Impedance Spectroscopy test were performed to study the photoelectrochemical properties of the nanostructures. - XRD: Samples were characterized by X-ray diffraction (XRD) to obtain more detail about the their crystalline structure. - XPS: The electronic structure and the chemical state of the elements that exist in the samples were analyzed by X-ray photoelectron spectroscopy (XPS). - Raman: The crystallinity of the samples was analyzed using a Raman laser microscope. METHODOLOGICAL INFORMATION WO3 andWO3/C nanostructures synthesis: The pure WO3 nanostructures were synthesized using the electrochemical anodization method using CH4O3S as an electrolyte. After the anodization, a thin blue layerwas formed, and itwas annealed at 600◦C for 4h in air to obtain a crystalline structure. In order to prepare the WO3/C electrodes, an evaporation method was chosen. This method consists in applying 8 V and vacuum pressure until reaching 10−5 mbar using the LEICA MED 20 equipment on the WO3 nanostructures previously synthesized, as specified in our work. Finally, a solid-state synthesis was used to prepare the WO3/WS2 electrodes from basicWO3 nanostructures. The WS2 layer was obtained by heating tungsten oxide nanostructures in the presence of thiourea with aWO3/thiourea ratio of 1:48 during 3 h at 773 K under argon. Once these 3 h had elapsed, the nanostructures were cooled to room temperature in an inert atmosphere, resulting in a black product. After the annealing treatment, the nanostructures were used in Li-ion batteries as an anode. Structure characterization: The crystal structure was examined by XRD (Bruker D8 Advance) with Cu Kα radiation (λ = 1.5406 Å) at a scan rate of 10◦ min−1. Raman spectroscopy was performed in a range of 0–2000 cm−1 on a WITec alpha300 R confocal Raman microscope. The electronic structure and the chemical state of the elements that exist in the samples were analyzed by XPS. The K-Alpha Thermo Scientific systemwith an Al-Kα radiation (1486.6 eV) was used to obtain the composition data. The pass energy and the pressurewere 50 eV and 10−7 Torr, respectively. Electrochemical tests: The electrochemical analyses were realized with a twoelectrode cell configuration. These batteries were setup by using the WO3 nanostructures layers as the working electrode (the mass of active material used in each battery was 6.5 mg). The counter electrode used in this test was a lithium sheet. The solution used as an electrolyte (Merck) was 1 M LiPF6 in a nonaqueous solution of dimethyl carbonate, and ethylene carbonate with a volume relation of 1:1 and fiberglass were used as spacers. The cells were constructed in a glove box with an inert atmosphere, and the electrolyte volume incorporated in each battery was 300 μl. Charge–discharge experiments were carried out with an Autolab PGSTAT302N potentiostat. The range potential between the charge and discharge tests that have been carried out was 0.01–4 V versus Li/Li+ at a current density of 100 mA g−1. The cyclic voltammogram (CV) measurements were performed at a scan rate of 0.5mV s−1 of between 0.01 and 4.0 V on an Autolab PGSTAT302N potentiostat. The EIS was examined at open circuit potential. The frequency range used was 0.1–10 kHz, and the signal perturbation had an amplitude of 10 mV.