LiI-doped N,N-dimethyl-pyrrolidinium iodine, an archetypal rotator-phase ionic conductor

Article Abstract:

N,N-Dimethyl-pyrrolidinium iodine, and effect of doping with LiI, was investigated using differential scanning calorimeter (DSC), NMR, and impedance spectroscopy. A slight decrease in phase transition onset temperatures, as well as the appearance of a superimposed narrow line in the (super 1)H NMR spectra with dopant, suggests that the LiI facilitates the mobility of the matrix material, possibly by the introduction of vacancies within the lattice.

Iodine & Compounds, Pyrrole, Pyrroles, Iodine compounds

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Electrochemical performance and surface properties of bare and TiO2-coated cathode materials in lithium-ion batteries

Article Abstract:

An investigation was performed on electrochemical performance and spectroscopic characterizations of the decomposition products from electrolytes on native and TiO2-coated LiCoO2 and LiMnO4 in different potential regions. Results of the investigation indicated that TiO2-coated materials exhibited better cyclic stability in different potential regions and the decomposition of the electrolytes was suppressed on the coated materials surface.

Primary Battery Manufacturing, Primary batteries, dry and wet, Lithium Dry Cell Batteries, Spectra, Titanium dioxide, Lithium cells, Lithium batteries

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Determination of diffusion rate and accommodation state of Li in mesophase carbon for anode materials by NMR spectroscopy

Article Abstract:

A direct measurement of the diffusion coefficients of Li in mesophase carbon of anode materials, independent of the interfacial transport effect was carried out using the pulsed gradient spin echo NMR method. The measurement revealed and confirmed the feasibility of disordered carbons for anode materials, which have large Li storage capacity, by improvement of interfacial reaction sites with electrolyte materials.

Analysis

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