Solubilization of SEI lithium salts in alkylcarbonate solvents

► SEI lithium compounds are weakly soluble in alkylcarbonate solvents. ► Lithium oxide Li 2O is almost insoluble in alkylcarbonates. ► Ethylene carbonate EC is highly solubilizing towards lithium salts. ► SEI lithium compounds aggregate as apolar and non-conductive species in alkylcarbonate solvents...

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Bibliographic Details
Published in:Fluid phase equilibria 2011-06, Vol.305 (2), p.121-126
Main Authors: Jones, Jennifer, Anouti, Mérièm, Caillon-Caravanier, Magaly, Willmann, Patrick, Sizaret, Pierre-Yves, Lemordant, Daniel
Format: Article
Language:English
Subjects:
Applied sciences
Atomic absorption analysis
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrochemical impedance spectroscopy
Exact sciences and technology
Lithium
Lithium batteries
Lithium compound
Lithium compounds
Lithium fluoride
Polycarbonates
Quadrupole
SEI
Solubility
Solubilization
Spectroscopy
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Summary:► SEI lithium compounds are weakly soluble in alkylcarbonate solvents. ► Lithium oxide Li 2O is almost insoluble in alkylcarbonates. ► Ethylene carbonate EC is highly solubilizing towards lithium salts. ► SEI lithium compounds aggregate as apolar and non-conductive species in alkylcarbonate solvents. The SEI (Solid Electrolyte Interphase) at the surface of electrodes in lithium-ion batteries is composed of various lithium compounds, organic or mineral, which have a direct impact on cycling performance. The main lithium species constituting the SEI and selected in this study are lithium fluoride LiF, lithium carbonate Li 2CO 3, lithium hydroxide LiOH, lithium oxide Li 2O, lithium methoxide LiOCH 3 and lithium ethoxide LiOC 2H 5. Their solubilities were determined in ethylene, propylene, dimethyl, diethyl and vinylene carbonates (EC, PC, DMC, DEC and VC) and in one of their mixtures commonly used in lithium-ion batteries (EC/PC/3DMC) by mean of atomic absorption spectroscopy (AAS). These solutions were also investigated by EIS (Electrochemical Impedance Spectroscopy) and conductimetry measurements. Results show that while solubilization properties differ between LiF and other lithium compounds considered, their association pattern in solution is identical and solutions are mainly constituted of quadrupolar aggregates.
ISSN:0378-3812
1879-0224
DOI:10.1016/j.fluid.2011.03.007