608140-12-1Relevant articles and documents
Speciation of aluminium in mixtures of the ionic liquids [C 3mpip] [NTf2] and [C4mpyr] [NTf2] with AlCl3: An electrochemical and nmr spectroscopy study
Rodopoulos, Theo,Smith, Leanne,Home, Michael D.,Ruether, Thomas
, p. 3815 - 3826 (2010)
This paper reports on the electrodeposition of aluminium on sev-eral substrates from the air- and water-stable ionic liquids 1-propyl-l-methyl- piperidinium bis(trifluoromethylsulfo-nyl)amide ([C3mpip][NTf 2]) and 1-butyl-1-methylpyrrolidinium bis(tri-fluoromethylsulfonyl) amide ([C4mpyr]-[NTf2]), which contain anhydrous AlCl 3. At an AlCl3 concentration of 0.75 molal, no evidence for aluminium electrodeposition was observed in either system at room temperature. However, aluminium electrodeposition becomes feasible upon heating the samples to 80°C. Aluminium electrode-position from bis(trifluoromethylsulfo-nyl)amide-based ionic liquids that con-tain AlCl 3 has previously been shown to be very dependent upon the AlCl 3 concentration and has not been dem-onstrated at AlCl3 concentrations below 1.13 molal. The dissolution of AlCl3 in [C 3mpip][NTf2] and [C4mpyr]-[NTf2] was studied by variable-temper-ature 27Al NMR spectroscopy to gain insights on the electroactive species re-sponsible for aluminium electrodeposi-tion. A similar change in the aluminium speciation with temperature was observed in both ionic liquids, thereby indicating that the chemistry was simi-lar in both. The electrodeposition of aluminium was shown to coincide with the formation of an asymmetric four-coordinate aluminium-containing spe-cies with an 27Al chemical shift of δ = 94 and 92 ppm in the [C3mpip] [NTf2]-AlCl3 and [C4mpyr] [NTf2]-AlCl3 sys-tems, respectively. It was concluded that the aluminium-containing species that give rise to these resonances corre-sponds to the electroactive species and was assigned to [AlCl3(NTf2)]-.
A Cation-Tethered Flowable Polymeric Interface for Enabling Stable Deposition of Metallic Lithium
Huang, Zhuojun,Choudhury, Snehashis,Gong, Huaxin,Cui, Yi,Bao, Zhenan
, p. 21393 - 21403 (2021/01/11)
A fundamental challenge, shared across many energy storage devices, is the complexity of electrochemistry at the electrode-electrolyte interfaces that impacts the Coulombic efficiency, operational rate capability, and lifetime. Specifically, in energy-dense lithium metal batteries, the charging/discharging process results in structural heterogeneities of the metal anode, leading to battery failure by short-circuit and capacity fade. In this work, we take advantage of organic cations with lower reduction potential than lithium to build an electrically responsive polymer interface that not only adapts to morphological perturbations during electrodeposition and stripping but also modulates the lithium ion migration pathways to eliminate surface roughening. We find that this concept can enable prolonging the long-term cycling of a high-voltage lithium metal battery by at least twofold compared to bare lithium metal.
Piperidine type ionic liquid and preparation method and application thereof
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Paragraph 0036; 0043; 0049; 0053; 0057; 0061; 0071, (2019/05/04)
The invention discloses a method for preparing piperidine type ionic liquid. The preparation method comprises the following steps of adding bromopropane into ethyl acetate, then adding N-methyl piperidine for a reaction for 8-48 h, eluting a solid phase with acetone, and performing rotary evaporation to obtain an intermediate product; dissolving the intermediate product in water, adding lithium trifluoromethanesulfonimide, washing an organic phase with water after extraction and liquid separation, and conducting rotary steaming and drying to obtain a final product. Meanwhile, the invention also discloses the piperidine type ionic liquid prepared by the method and application of the piperidine type ionic liquid as an electrolyte component of a lithium ion battery. The preparation method isimplemented at the normal temperature and has the advantages of being high in yield, economical and simple in operation. The piperidine type ionic liquid has the advantages of high purity, low water content, low viscosity, high conductivity and wide electrochemical window. The piperidine type ionic liquid prepared by the method is used as the electrolyte component to be applied to an electrolyte of the lithium ion battery and shows better inflammability and chemical stability and lower electrochemical impedance.
Ionic liquids based on (fluorosulfonyl)(pentafluoroethanesulfonyl)imide with various oniums
Liu, Kai,Zhou, Yi-Xuan,Han, Hong-Bo,Zhou, Si-Si,Feng, Wen-Fang,Nie, Jin,Li, Hong,Huang, Xue-Jie,Armand, Michel,Zhou, Zhi-Bin
experimental part, p. 7145 - 7151 (2011/01/08)
New hydrophobic ionic liquids based on (fluorosulfonyl) (pentafluoroethanesulfonyl)imide ([(FSO2)(C2F 5SO2)N]-, FPFSI-) anion with various oniums, including imidazolium, tetraalkyl ammonium, pyrrolidinium, and piperidinium, were prepared and characterized. Their physicochemical and electrochemical properties, including phase transitions, thermal stability, viscosity, density, specific conductivity and electrochemical windows, were extensively characterized, and were comparatively studied with the corresponding ionic liquids containing the isomeric but symmetric TFSI- ([(CF 3SO2)2N]-) anion. These new FPFSI--based ionic liquids display low melting points, low viscosities, good thermal stability, and wide electrochemical windows allowing Li deposition/dissolution. All these desired properties suggest they are potential electrolyte materials for Li (or Li-ion) batteries.