Composition of lithium aluminum hydride, lithium borohydride, and their alkoxy derivatives in ether solvents as determined by molecular association and conductance studies
Synthesis and Characterization of Network Type Single Ion Conductors
摘要:
New single ion conductors were synthesized by grafting the allyl group-containing lithium salt, lithium bis(allylmalonato)borate (LiBAMB), onto allyl group-containing comb-branch polyacrylate or polymethacrylate ethers by means of hydrosilylation. The highest ambient temperature conductivity of 3.5 x 10(-7) S cm(-1) was obtained for a polyacrylate ether-based single ion conductor containing eight EO units in the side chain and five EO units in the cross-linking side chain, to which the anion was fixed with a salt concentration of EO/Li = 20. For polyacrylate ether-based single ion conductors, an increase of chain length in both side chains and cross-linking anion chains favors an increase of ionic conductivity. The addition of 50 wt % EC/DMC (1/1, wt/wt) increased the ionic conductivity by more than 2 orders of magnitude due to both the increase in ionic mobility from the liquid phase and the increase in the concentration of free ions from the high dielectric constant of the solvent. The preliminary Li/Li cycling profiles of dry polyacrylate- and polymethacrylate ether-based single ion conductors are encouraging as almost no concentration polarization or relaxation was observed. The observed increase in cell potential with cycling is apparently due to an increase in the interfacial impedance associated with the SEI layer, and the cell failure is accompanied by the decomposition of the ester bond of the polyacrylate backbone.
The present invention relates to electrolyte formulations containing cyano-alkoxy-borate anions, their preparation and their use, in particular as part of electrolyte formulations for electrochemical or optoelectronic devices and special compounds containing cyano-alkoxy-borate anions.
Alkoxycyanoborates: metal salts and low-viscosity ionic liquids
作者:Nils Schopper、Jan A. P. Sprenger、Ludwig Zapf、Guido J. Reiss、Nikolai V. Ignat’ev、Maik Finze
DOI:10.1039/d0nj04950f
日期:——
measurements. In addition to alkalimetal salts, room temperature ionic liquids [EMIm][ROB(CN)3] (R = CH3, C2H5, CH2CF3) have been prepared. These ionic liquids exhibit very low melting points or glass transition temperatures, low viscosities, and high chemical, thermal, and electrochemical stabilities. The influence of alkyl chain length and the effect of partial fluorination of the alkoxy group on these properties
A stable fluorinated and alkylated lithium malonatoborate salt for lithium ion battery application
作者:Shun Wan、Xueguang Jiang、Bingkun Guo、Sheng Dai、John B. Goodenough、Xiao-Guang Sun
DOI:10.1039/c5cc01428j
日期:——
A new fluorinated and alkylated lithium malonatoborate salt, lithium bis(2-methyl-2-fluoromalonato)borate (LiBMFMB), has been synthesized for lithium ion battery application.
Tris(trimethylsilyl)methyl and tris(dimethylphenylsilyl)methyl derivatives of boron. Crystal structures of dihydroxy[tris(trimethylsilyl)methyl]borane and of the lithium–boron complex [(MeOH)<sub>2</sub>Li(µ-OMe)<sub>2</sub>B(OMe)<sub>2</sub>]
作者:Salih S. Al-Juaid、Cohn Eaborn、Mohamed N. A. El-Kheli、Peter B. Hitchcock、Paul D. Lickiss、M. Elias Molla、J. David Smith、Jalal A. Zora
DOI:10.1039/dt9890000447
日期:——
Tris(trimethylsilyl)methyl-lithium, LiC(SiMe3)3, reacts with trimethoxyborane to give the compound (Me3Si)3CB(OMe)2(7) and the lithium–boroncomplex LiB(OMe)4(8). The latter is converted on crystallisation from methanol into the solvate [(MeOH)2Li(µ-OMe)2B(OMe)2](11), which has been characterised by X-ray diffraction. The hydrolysis of (7) gives the dihydroxyborane (Me3Si)3CB(OH)2(2), which may be
}2][N(SO2CF3)2]2 (1‐2.0), with solid‐state ionic conductivity was synthesized. The crystal structure of 1‐2.0 consists of the one‐dimensional ionic conduction paths. The paths were afforded as a result of the self‐assembled stacking of the component molecules of 1‐2.0 with channelstructurescontaininglithiumions. In this supramolecule, one lithiumion holds the component molecules in specific positions