Correlation of AC-impedance and in situ X-ray spectra of LiCoO2

Article Abstract:

The in-situ X-ray and AC-impedance spectra were obtained simultaneously during the deintercalation of lithium from LiCoO2 using a specially designed electrochemical cell. The correlation confirms the hypothesis on the interpretation of the AC-dispersions in terms of an equivalent circuit comprising an element that relates the charge of the intrinsic electronic conductivity, occurring at the early stages of deintercalation, to the semiconductor to metal transition caused by the change of the cell parameters.

Primary Battery Manufacturing, Primary batteries, dry and wet, Lithium Dry Cell Batteries, Clathrate compounds, Lithium cells, Lithium batteries

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Polyniline doped with dimethyl sulfate as a nucleophilic dopant and its electrochemical properties as an electrode in a lithium secondary battery and a redox supercapacitor

Article Abstract:

The possibility of a power source device adopting the polyaniline-dimethyl sulfate (PAn-DMS) electrodes is investigated by characterizing the physical properties of PAn powder, doped by nucleophilic doping of (DMS) and its electrochemical behaviors. It is shown that the nucleophilic addition of DMS into PAn concurrently resulted in an increase of the charge transport properties and enhanced the processability.

Science & research, All Other Basic Organic Chemical Manufacturing, Industrial Organic Chemicals, Methyl Sulfide, Research, Electric properties, Charge transfer, Dimethyl sulfide

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Diffusion dynamics of the Li atom on amorphous carbon: A direct molecular orbital-molecular dynamics study

Article Abstract:

Direct molecular orbital-molecular dynamics (MO-MD) calculations are applied to diffusion processes of the Li atom on a model surface of amorphous carbon and compared with the diffusion mechanism of [Li.sup.} ion. Results reveal that at higher temperature (1000 K), the Li atom moves from the center to edge region of the model surface and is trapped in the edge.

Analysis, Molecular dynamics, Amorphous substances, Amorphous materials

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