Wide electrochemical window ionic salt for use in electropositive metal electrodeposition and solid state Li-ion batteries

Abstract

A stable hydrophobic ionic crystalline solid comprised of the N-propyl-N-methylpiperidinium cation and hexafluorophosphate anion PP13PF6 exhibits a remarkably wide electrochemical window of 7.2 V.

Molecular diffusion and dc conductivity perfectly correlated with molecular rotational dynamics in a plastic crystalline electrolyte

“…When the dominant charge carriers are Li + ions, the temperature dependence of the conductivity is no longer perfectly correlated with that of the molecular rotational dynamics, as seen in Fig.s 2 and 3a, hence the motion of the Li + ions is decoupled 6 from (occurs on a faster timescale than) that of the organic matrix. This rules out a paddling-wheel mechanism [8][9][10][11] for Li + ion conduction, and indicates that electrical conduction in the undoped mixture is due to molecular rather than atomic ions. Because translational and rotational degrees of freedom are generally considered to be independent, a perfect connection between the translational diffusion and the on-site orientational motion is at first quite surprising.…”

“…25 If such decoupling took place also in pure SN, it would indicate that its relatively high ionic mobility is merely an effect of the low density of the plastic phase 26 rather than of the rotational dynamics, as generally supposed. [8][9][10][11] To elucidate these matters, we have measured by means of dielectric spectroscopy the dc conductivity and molecular dynamics of pure and lithium-salt doped binary GN-SN mixtures at low glutaronitrile weight percentage (15%). Besides yielding relatively good miscibility even in the solid state, 25,27 the addition of GN in sufficient amount effectively suppresses the transition to the fully ordered monoclinic phase, thus enlarging the temperature range of the plastic-crystal phase.…”

Ionic Liquids Roles and Perspectives in Electrolyte for Dye-Sensitized Solar Cells

“…Among the members of the heterocyclic family, imidazolium has been commonly used as the cation for ILs due to several properties, such as lower viscosity, higher diffusivity, higher density, and higher thermal stability, when compared to pyridinium, pyrrolidinium, and ammonium [12]. Besides, the electrochemical windows of the ILs were mostly reported at about 4 V, which appeared practical for many electrochemical devices, such as DSSCs [13].…”

The synthesis and electrical properties of hybrid gel electrolytes derived from Keggin-type heteropoly acids and 3-(pyridin-1-ium-1-yl)propane-1-sulfonate (PyPs)

“…[17][18][19][20][21] Various hybrid gels were developed using POMs and ILs such as Nmethyl imidazolium-1-(3-sulfonic group) propyl (MIMPS), 3-(pyridine-1-ium-1-yl)propane-1-sulfonate (PyPs), 1-(3-sulfonic group) triethylamine (TEAPS) and N-propyl-N-methylpiperidinium hexauorophosphate. [22][23][24][25][26][27][28][29][30] Several heteropoly acids (HPAs) and polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG) hybrids were also recently reported. 28 Herein, we report the synthesis and structural, chemical and electrochemical characterization of hybrid gel electrolytes based on recently developed 3-(pyridin-1-ium-1-yl)propane-1sulfonate (PyPs) 24 IL and H 3 PW 11 MoO 40 , H 4 PMo 11 VO 40 and H 5 PMo 11 V 2 O 40 for potential electrochemical energy conversion and storage applications.…”