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Enhanced performance of lithium metal batteries via cyclic fluorinated ether based electrolytes
ID
Ishfaq, Hafiz Ahmad
(
Author
),
ID
Cruz Cardona, Carolina
(
Author
),
ID
Tchernychova, Elena
(
Author
),
ID
Johansson, Patrik
(
Author
),
ID
Dominko, Robert
(
Author
),
ID
Drvarič Talian, Sara
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S2405829724002022
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Abstract
To address the challenges associated with applying high-voltage cathodes in lithium metal batteries (LMBs) there is a need for new electrolytes enabling stable interphases at both electrodes. Here we attack this by using a dioxolane-derived cyclic fluorinated ether, 2,2-bis(trifluoromethyl)-1,3-dioxolane (BTFD), as a fluorinated diluent to a 1,2-dimethoxyethane (DME) based electrolyte. The cells using the resulting BTFD-based electrolytes exhibit higher Coulombic efficiencies for lithium stripping and plating as compared to those using the non-fluorinated ether-based electrolyte. This originates from the reduced formation of ‘dead Li’ at the anode, as shown by using electrochemical impedance spectroscopy (EIS). In practice, the BTFD-based electrolytes are shown to improve the performance of Li||NMC cells, which is due to the formation of a predominantly inorganic cathode electrolyte interphase (CEI) that suppresses the cathode degradation during cycling. We used X-ray photoelectron spectroscopy (XPS) and scanning transmission electron microscopy (STEM) to characterize the CEIs’ overall composition and structure. To obtain more details on the CEI speciation, Raman and nuclear magnetic resonance (NMR) spectroscopies were employed, assisted by molecular level computations. Overall, we demonstrate how the very design of the electrolyte composition influences the performance of LMBs.
Language:
English
Keywords:
lithium metal batteries
,
high-voltage cathode
,
fluorinated electrolyte
,
locally highly concentrated electrolyte
,
solvation structure
Work type:
Article
Typology:
1.01 - Original Scientific Article
Organization:
FKKT - Faculty of Chemistry and Chemical Technology
Publication status:
Published
Publication version:
Version of Record
Year:
2024
Number of pages:
10 str.
Numbering:
Vol. 69, art. 103375
PID:
20.500.12556/RUL-156288
UDC:
544.5/.6
ISSN on article:
2405-8289
DOI:
10.1016/j.ensm.2024.103375
COBISS.SI-ID:
193555203
Publication date in RUL:
17.05.2024
Views:
318
Downloads:
44
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Record is a part of a journal
Title:
Energy storage materials
Publisher:
Elsevier
ISSN:
2405-8289
COBISS.SI-ID:
87651587
Licences
License:
CC BY 4.0, Creative Commons Attribution 4.0 International
Link:
http://creativecommons.org/licenses/by/4.0/
Description:
This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Secondary language
Language:
Slovenian
Keywords:
elektrokemija
,
akumulatorji
,
baterije
,
elektroliti
,
fluoridi
Projects
Funder:
EC - European Commission
Funding programme:
H2020
Project number:
945357
Name:
Doctorate Programme on Emerging Battery Storage Technologies INspiring Young scientists
Acronym:
DESTINY
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0423
Name:
Sodobni akumulatorji kot podpora zelenemu prehodu in elektromobilnosti
Funder:
Other - Other funder or multiple funders
Funding programme:
VINNOVA, Batteries Sweden (BASE)
Project number:
2019-00064
Funder:
Other - Other funder or multiple funders
Funding programme:
Swedish Research Council (VR), Distinguished Professor
Project number:
2021-00613
Name:
Next Generation Batteries
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