Superior coulombic efficiency of lithium anodes for rechargeable batteries utilizing high-concentration ether electrolytes was written by Xie, Jian-De;Liu, Weng-Jing;Li, Chi;Patra, Jagabandhu;Gandomi, Yasser Ashraf;Dong, Quan-Feng;Chang, Jeng-Kuei. And the article was included in Electrochimica Acta in 2019.Recommanded Product: 2,5,8,11-Tetraoxadodecane This article mentions the following:
This study adopts high-concentration ether electrolytes to improve high-rate capability, cycling stability, and Coulombic efficiency (CE) for lithium ion batteries with lithium anode. A series of ether-based electrolytes including lithium bis(fluorosulfonyl)imide (LiFSI)-glyme/ethylene carbonate (EC), LiFSI-glyme/EC, LiFSI-diglyme/EC, LiFSI-triglyme/EC, LiFSI-tetraglyme (G4)/EC, and LiFSI-1,3-dioxolane (DOL)/EC, along with commonly used LiPF6-DEC/EC were prepared to delineate the influences of concentration, chain length, mol. structure (linear or ring ether), and EC additive on the electrochem. performance of Li anodes. An optimum composition for ether-based electrolyte was determined resulting in significant improvement in anti-flammability as well as CE at both low and high rates. At ultra-high c.d. operation (e.g. 6 mA cm-2), the CE was 95.5 and 97.1% with 3 M LiFSI-G4/EC and 3 M LiFSI-DOL/EC, resp. Using 1 M LiPF6 carbonate-based electrolyte tend to grow a needle-like dendritic structure when depositing lithium metal on Cu foils, whereas high-concentration ether electrolyte promotes a knot-like and rounded Li metal microstructure. High concentration EC-based electrolytes, are capable of facilitating Li+ almost in tandem with solvent mols., thereby reducing the number of free mols., reducing the chance of side reaction with Li metal, and subsequently inhibiting the formation of dendritic Li structures. In the experiment, the researchers used many compounds, for example, 2,5,8,11-Tetraoxadodecane (cas: 112-49-2Recommanded Product: 2,5,8,11-Tetraoxadodecane).
2,5,8,11-Tetraoxadodecane (cas: 112-49-2) belongs to ethers. Of all the functional groups, ethers are the least reactive ones. Ether bonds are quite stable towards bases, oxidizing agents and reducing agents. But on the other hand, ethers undergo cleavage by reaction with acids. Ethers can form hydrogen bonds with other molecules (alcohols, amines, etc.) that have O―H or N―H bonds. The ability to form hydrogen bonds with other compounds makes ethers particularly good solvents for a wide variety of organic compounds and a surprisingly large number of inorganic compounds.Recommanded Product: 2,5,8,11-Tetraoxadodecane
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem