Dr. Xabier Júdez graduated in 2015 in Chemical Engineering from the University of the Basque Country (UPV/EHU) and completed a master´s degree in the same subject in 2016 from the UPV/EHU and the University of Cantabria. That year, Xabier joined CIC energiGUNE for the development of his master´s thesis in the study of all-solid-state lithium-sulfur batteries.

Xabier continued his career at CIC energiGUNE through the development of a doctoral thesis entitled "Polymer-based electrolytes for all-solid-state lithium-sulfur batteries", where he fabricated and characterized a large number of novel electrolytes for these new generation batteries. In addition to several training activities, this period included a three month stay at the Chinese Academy of Sciences in Beijing (China). Finally, Xabier defended his thesis in December 2019, obtaining the international mention and Cum Laude recognition.

After that, in 2020, he joined the Commission for Alternative Energies (CEA Grenoble, France) for one year as a postdoctoral researcher for the study of alternative electrolytes for new generation lithium-ion batteries.

Finally, in 2021 he joined again CIC energiGUNE as a postdoctoral researcher in the "Lithium-Sulfur Batteries" research line, within the Cell Prototyping group.

Scientific interests

  • New generation batteries
  • Lithium-sulfur batteries
  • New generation and all-solid-state electrolytes

Scientific career

  • Chemical Engineering
  • Electrochemical energy storage
  • Battery fabrication and characterization


  • Best academic record of the promotion of the master (2016, UPV/EHU)
  • Grant for the completion of university master´s degree (2016-2017, UPV/EHU)
  • Pre-doctoral program’s scholarship for the training of the research staff (2017-2019, Basque Government)
  • Grant for short stays in other centers, Egonlabur (2019, Basque Government)

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