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Page 12 of 14 Alvarez-Tirado et al. Energy Mater 2023;3:300003 https://dx.doi.org/10.20517/energymater.2022.59

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0.5 mA·cm ). When Li-O cells were cycled, cells with Iongel-TFSI exhibited one of the highest absolute
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discharge capacities (2.48 mAh·cm ) and excellent cycling capability with 100% capacity retention and 100%
-
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Coulombic efficiency for at least 25 cycles. In general, the FSI and TFSI based electrolytes were the best for
Li-O cell tests in terms of capacity and cycling capability. Iongel-CFSO, Iongel-BETI and Iongel-FD had a
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lower performance despite their larger fluorinated content.
Overall, the findings of this work show the potential use of polymeric iongels as electrolytes in lithium
rechargeable cells. Due to their remarkable lithium compatibility, these soft solid ionic materials could also
be used for effective lithium protection. In addition, the simplicity of the photopolymerization approach
brings advantages for easier adoption for industrial batteries.

DECLARATIONS
Author’s contributions
Conceptualization: Alvarez-Tirado M, Castro L, Tomé LC, Mecerreyes D
Data curation, investigation, validation and visualization: Alvarez-Tirado M
Formal analysis: Alvarez-Tirado M, Castro L, Guzmán-González G, Guéguen A, Mecerreyes D
Methodology: Alvarez-Tirado M, Guzmán-González G, Tomé LC, Mecerreyes D
Writing - original draft and review & editing: Alvarez-Tirado M, Castro L, Guzmán-González G, Guéguen
A, Tomé LC, Mecerreyes D
Supervision: Castro L, Mecerreyes D
Ionic liquids: Tomé LC
Funding acquisition: Mecerreyes D

Availability of data and materials
The experimental details are provided in the Supplementary Material.

Financial support and sponsorship
This work was supported by the Horizon 2020 European Commission’s funded Marie Skłodowska-Curie
project POLYTE-EID [grant numbers 765828]. The manuscript was written through the contributions of all
authors that have given approval to the final version of the Letter.

Conflicts of interest
All authors declared that there are no conflicts of interest.

Ethical approval and consent to participate
Not applicable.

Consent for publication
Not applicable.

Copyright
© The Author(s) 2023.

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