Glyme-lithium bis(trifluoromethylsulfonyl)amide superconcentrated electrolytes: salt addition to solvate ionic liquids lowers ionicity but liberates lithium ions was written by Kitada, Atsushi;Koujin, Yoshiki;Shimizu, Masahiro;Kawata, Kio;Yoshinaka, Chiaki;Saimura, Masayuki;Nagata, Takashi;Katahira, Masato;Fukami, Kazuhiro;Murase, Kuniaki. And the article was included in Journal of the Electrochemical Society in 2021.Quality Control of 2,5,8,11-Tetraoxadodecane This article mentions the following:
Solvate ionic liquids (ILs) such as binary equimolar mixtures of glymes (ethyleneglycol-dimethylether or CH3(OCH2CH2)nOCH3) and lithium bis(trifluoromethylsulfonyl)amide (LiTf2N; Tf = SO2CF3) are known to show identical self-diffusion coefficients for glymes and Li+ ions. Here, we report that the addition of LiTf2N to the solvate ILs drastically changes their electrolyte properties. When the lithium salts are added to give the super-concentrated electrolytes with [O]/[Li+] = 3 (molar ratio of ether oxygen to Li+), ligand exchange or hopping conduction of Li+ takes place for triglyme (G3; n = 3) and tetraglyme (G4; n = 4). In addition, the Li+ transference number tLi+(EC), electrochem. measured under anion blocking conditions, increases about 3-6 times compared with the solvate ILs. Consequently, segmental motion of glymes apparently affects the transport properties even for the shorter G3 in the super-concentrated region. The relationship between the coordination structure and the transport properties are also discussed as a function of ionicity, the extent of the contribution of self-diffusion to the actual ion conduction. Plots vs ionicity demonstrate that a clear line can be drawn between the solvate ILs and the super-concentrated electrolytes. In the experiment, the researchers used many compounds, for example, 2,5,8,11-Tetraoxadodecane (cas: 112-49-2Quality Control of 2,5,8,11-Tetraoxadodecane).
2,5,8,11-Tetraoxadodecane (cas: 112-49-2) belongs to ethers. Relative to alcohols, ethers are generally less dense, are less soluble in water, and have lower boiling points. They are relatively unreactive, and as a result they are useful as solvents for fats, oils, waxes, perfumes, resins, dyes, gums, and hydrocarbons. Vapours of certain ethers are used as insecticides, miticides, and fumigants for soil. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly autoxidize to form hydroperoxides and dialkyl peroxides. If concentrated or heated, these peroxides may explode. To prevent such explosions, ethers should be obtained in small quantities, kept in tightly sealed containers, and used promptly.Quality Control of 2,5,8,11-Tetraoxadodecane
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem