Lithium-cyclo-difluoromethane-1,1-bis(sulfonyl)imide as a stabilizing electrolyte additive for improved high voltage applications in lithium-ion batteries

Lithium-cyclo-difluoromethane-1,1-bis(sulfonyl)imide (LiDMSI) was evaluated as an electrolyte additive in lithium-ion batteries for improved high voltage applications. Cycling the cathode at high potentials leads to the electrochemical oxidation of the salt to form a cathode electrolyte interphase (...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2015-04, Vol.17 (14), p.9352-9358
Main Authors: Murmann, Patrick, Streipert, Benjamin, Kloepsch, Richard, Ignatiev, Nikolai, Sartori, Peter, Winter, Martin, Cekic-Laskovic, Isidora
Format: Article
Language:English
Subjects:
Additives
Cathodes
Cycles
Electrochemical oxidation
Electrolytes
High voltages
Lithium-ion batteries
X-ray photoelectron spectroscopy
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Summary:Lithium-cyclo-difluoromethane-1,1-bis(sulfonyl)imide (LiDMSI) was evaluated as an electrolyte additive in lithium-ion batteries for improved high voltage applications. Cycling the cathode at high potentials leads to the electrochemical oxidation of the salt to form a cathode electrolyte interphase (CEI) layer on the cathode surface. With the addition of 2 wt% of LiDMSI to the 1 M LiPF6 in 1 : 1 (by wt) EC : DEC electrolyte, the capacity retention and the Coulombic efficiency in LiNi1/3Co1/3Mn1/3O2/Li-half-cells as well as in LiNi1/3Co1/3Mn1/3O2/graphite-full-cells were improved. The cycling results point out the less over-potential and resistance at the cathode/electrolyte interface. These improvements are studied by SEM, EIS and XPS techniques.
ISSN:1463-9076
1463-9084
DOI:10.1039/c5cp00483g