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Abstract
ZnFe2O4 (ZFO) Li-ion batteries (LIBs) represent a reliable, affordable, and safe energy storage technology for use in portable application. However, current LIB active materials (graphite, lithium/transition metal spinel or layered oxides, olivine structures) can store only limited energy since they rely on insertion storage based on solid-state host-guest interactions. Moreover, performances and durability of the cells are strongly influenced by the characteristics of the solid electrolyte interphase (SEI), which is formed upon the electrodes, especially for graphite, during the first charge/discharge cycle. This process is difficult to study and control. The aim of this work is to study the evolution of the SEI in this innovative anode material at selected charging steps by exploiting the surface sensitivity of the soft X-ray absorption spectroscopy (XAS). This technique requires synchrotron radiation and was never used before for such a purpose, although it appears to be very suitable for a detailed depth profiling of the SEI of advanced electrodes. The main conclusions that can be drawn by this work can be summarized as follows: 1) the evolution of the SEI takes place already during the first steps of the charging process and its thickness reach about 40 nm at about 1/3 of the full capacity, with a stable total thickness up to 20 working cycles; 2) the XAS technique is found to be very effective providing an estimate of the local thickness of the SEI, and indicates that the SEI grows preferentially around the ZFO nanoparticles.
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Authors (10)
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Andrea DiCicco prof.
- School of Science and Technology, University of Camerino, Camerino, Italy Physics Division
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Angelo Giglia
- CNR, Trieste, Italy Istituto Officina Materiali
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Roberto Gunnella
- School of Science and Technology, University of Camerino, Camerino, Italy Physics Division
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Stephan Koch
- Helmholtz Institute Ulm, Ulm , Germany Electrochemistry for Batteries
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Franziska Mueller
- Helmholtz Institute Ulm, Ulm , Germany Electrochemistry for Batteries
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Francesco Nobili
- School of Science and Technology, University of Camerino, Camerino, Italy Chemistry Division
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Marta Pasqualini
- School of Science and Technology, University of Camerino, Camerino, Italy Chemistry Division
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Stefano Passerini
- Helmholtz Institute Ulm, Ulm , Germany Electrochemistry for Batteries
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Roberto Tossici
- School of Science and Technology, University of Camerino, Camerino, Italy Chemistry Division
Cite as
Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1002/aenm.201500642
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
Advanced Energy Materials
no. 5,
edition 18,
pages 1 - 6,
ISSN: 1614-6832 - Language:
- English
- Publication year:
- 2015
- Bibliographic description:
- Dicicco A., Giglia A., Gunnella R., Koch S., Mueller F., Nobili F., Pasqualini M., Passerini S., Tossici R., Witkowska A.: SEI Growth and Depth Profiling on ZFO Electrodes by Soft X-Ray Absorption Spectroscopy// Advanced Energy Materials. -Vol. 5, iss. 18 (2015), s.1-6
- DOI:
- Digital Object Identifier (open in new tab) 10.1002/aenm.201500642
- Verified by:
- Gdańsk University of Technology
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