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Abstract
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.
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Authors (8)
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Javad Seyed Rezvani dr
- University of Camerino Physics Division
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Roberto Gunnella
- University of Camerino Physics Division
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Franziska Mueller
- Karlsruhe Institute of Technology and Helmholtz Institute Ulm
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Marta Pasqualini
- University of Camerino Chemistry Division
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Francesco Nobili dr
- University of Camerino Chemistry Division
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Stefano Passerini
- Helmholtz Institute Ulm
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Andrea DiCicco prof.
- University of Camerino Physics Division
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
ACS Applied Materials & Interfaces
no. 9,
edition 5,
pages 4570 - 4576,
ISSN: 1944-8244 - Language:
- English
- Publication year:
- 2017
- Bibliographic description:
- Rezvani J., Gunnella R., Witkowska A., Mueller F., Pasqualini M., Nobili F., Passerini S., Dicicco A.: Is the Solid Electrolyte Interphase an Extra-Charge Reservoir in Li-Ion Batteries?// ACS Applied Materials & Interfaces. -Vol. 9, iss. 5 (2017), s.4570-4576
- DOI:
- Digital Object Identifier (open in new tab) 10.1021/acsami.6b12408
- Verified by:
- Gdańsk University of Technology
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