Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: lithium salt

Sortuj według:

Ogranicz wyniki do:

The structure and conductivity of solid polyurethane electrolytes

Leszkowski K., Strączyński M., Miszczyk A., Haponiuk J. T.

Polish Journal of Applied Chemistry

2009

Vol. 53, nr 2

141-146

The aim of the study was to determine the structure and electric properties of new solid polyurethane electrolytes. Polyurethane samples were prepared from 4,4'-diphenylmethane diisocyanate (MDI), poly(tctramethylene glycol) (PTMG) and 1,4-butanediol (BDO). Doping salts, LiCl or LiClOj were introduced into the polyurethane melt during extrusion using a laboratory twin-extruder. The obtained solid polyurethane electrolyte samples were characterized by FTIR-ATR spectroscopy and strength-strain properties. The conductivity was estimated by means of impedance spectroscopy using the direct current (DC) method and alternating current (AC) method. The conductivity was found to be related to the mode of sample preparation, namely, to doping in the liquid state at 60°C during polyurethane synthesis or mixing at 200"C in the melt.

New electrolyte for electrochromic devices

Kucharski M., Łukaszewicz T., Mrozek P.

Opto-Electronics Review

2004

Vol. 12, No. 2

175-180

The paper presents the results of the research on a new polymer-gel electrolyte for electrochromic devices. In the performed studies, various electrolytes were used. They all contained an ionic conductor, a matrix of polymer gel and organic solvent or mixture of polar organic solvents. The electrolyte which had the best properties contained 8% LiCF₃SO₃ as an ionic conductor, a matrix consisting of two polymers: 10% PMMA, 6% PEO, and a mixture of the following two polar organic solvents: 38% propylene carbonate and 38% ethylene carbonate. The high conductivity (σ = 4.8 mS/cm), which provides easy deposition in layers, gives stability (resistance) in time and high transmittance value of radiation in the visible region makes the electrolyte very useful for electrochromic devices. A seven-layer electrochromic device with this new gel electrolyte was assembled according to the following formula: glass ₁ /ITO/WO₃/electrolyte/BP/ITO/glass ₂, where ITO was an indium-tin film oxide, WO₃ was an electrochemically deposited tungsten oxide film and BP an electrochemically deposited film of prussian blue. The density of the current flowing through the unit and the transmittance at the wavelength ʎ = 550 nm are given in the paper as a function of sinusoidal voltage. The transmittance varies from 70–50% (coloured) to 25–10% (for fully bleached) in the range of visible radiation and the colouration efficiency is high (above 100 cm²/C). These results are considerably better than those reported in the other similar studies.