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Camerino XAS group Publications
HIGHLIGHTS
  • X-ray Absorption Spectroscopy investigations of disordered matter, plenary lecture given at the XAFS international conference held in Krakow (July 2018).
    Slides of the talk (pdf) given by Andrea Di Cicco at the XAFS 2018 international conference at Krakow entitled X-ray Absorption Spectroscopy investigations of disordered matter.
    Picture taken during the talk in the 1200 seats auditorium maximum in Krakow. Link to the paper published on the IXAS research review, containing part of the talk scientific content.
  • Is the Solid Electrolyte Interphase an Extra-Charge Reservoir in Li-Ion Batteries?, paper presented at international conferences (2017) on energy-related materials
    Original paper: S. Javad Rezvani , Roberto Gunnella, Agnieszka Witkowska, Franziska Mueller, Marta Pasqualini, Francesco Nobili, Stefano Passerini, and Andrea Di Cicco, Is the Solid Electrolyte Interphase an Extra-Charge Reservoir in Li-Ion Batteries?, ACS Appl. Mater. Interfaces, 2017, 9 (5), pp 4570-4576 [on line electronic journal]
    Summary: Advanced metal oxide electrodes in Li-ion batteries usually show reversible capacities exceeding the theoretically expected ones. Despite many studies and tentative interpretations, the origin of this extra-capacity is not assessed yet. Lithium storage can be increased through different chemical processes developing in the electrodes during charging cycles. The solid electrolyte interface (SEI), formed already during the first lithium uptake, is usually considered to be a passivation layer preventing the oxidation of the electrodes while not participating in the lithium storage process. In this work, we combine high resolution soft X-ray absorption spectroscopy with tunable probing depth and photoemission spectroscopy to obtain profiles of the surface evolution of a well-known prototype conversion-alloying type mixed metal oxide (carbon coated ZnFe2O4) electrode. We show that a partially reversible layer of alkyl lithium carbonates is formed (5-7 nm) at the SEI surface when reaching higher Li storage levels. This layer acts as a Li reservoir and seems to give a significant contribution to the extra-capacity of the electrodes. This result further extends the role of the SEI layer in the functionality of Li-ion batteries.
    Watch the video story of our scientific activity within the SIRBATT project!

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