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Chemical Capacitor Based on Activated Carbon Powder and Poly(vinyl alcohol)-H2SO4 Proton Conducting Polymer Electrolyte

100%

Lewandowski A. , Galiński M.

tom Vol. 75, nr 12

1913-1920

A totally solid state electric double layer capacitor was fabricated using a PVA-H2SO4-H2O polymer electrolyte and activated carbon powder (ACP) as an electrode material. The polymer electrolyte served both as a separator as well as a binder of carbon powder. The PVA-H2SO4-H2O (separator) as well as PVA-H2SO4-H20-ACP foils were prepared by the solution cast technique. The electric performance of the capacitors was investigated by cyclic voltammetry, galvanostatic charging/discharging and impedance spectroscopy. The prototype capacitors were assembled by contacting three foils (electrode + electrolyte + electrode) having a thickness of ca. 1.5-2 mm, a diameter of 1.8 cm and a capacity of ca. 0.6-1.5 F. The specific capacitance of ACP was estimated to be of ca. 130 F/g.

Ionic conductivity of polymer electrolytes comprising acrylonitrile-butyl acrylate copolymer and a lithium salt

63%

Łasińska A. , Dygas J. R. , Krok F. , Marzantowicz M. , Florjańczyk Z. , Tomaszewska A. , Zygadło-Monikowska E.

Materials Science Poland

2006

tom Vol. 24, No. 1

187--194

New polymer electrolytes were prepared by mixing random copolymers of acrylonitrile and butyl acrylate (poly(AN-co-BuA)) with lithium bis(trifluoromethanesulfone) imide (LiTFSI). Electrical properties were studied by the impedance spectroscopy. The glass transition temperature was studied by DSC. Presented results concern a broad range of compositions, from a pristine copolymer to the system with 98 wt. % of salt. Correlation was established between the glass transition temperature, ionic conductivity, and salt content in the system. Mixtures of poly(AN-co-BuA) and LiTFSI exhibit much lower glass transition temperatures than the parent copolymer. Effects of ageing were observed for electrolytes with high salt content.

Half-liquid electrolyte in the abrasive flow machining.

63%

Dąbrowski L. , Marciniak M.

tom Vol. 27, nr 3

35-44

The investigations of polymer electrolytes with non organic fillers applied in the Abrasive Flow Machining (AFM) are presented in this paper. A flow of cations and anions is discussed for half-liquid electrolyte. The influence of electrolyte flow velocity on the current density is estimated for constant inter-electrode gap value and constant voltage. The results of the anode surface roughness measurements are also placed in this paper.

Wspomaganie obróbki przetłoczno-ściernej procesem elektrochemicznym (ECM) umożliwiają polimerowe elektrolity. Przewodnictwo jonowe polimerowych elektrolitów jest wielokrotnie mniejsze od przewodnictwa elektrolitów stosowanych w ECM. Dodawanie wypełniaczy nieorganicznych w postaci materiałów ściernych do tych elektrolitów powoduje dalsze zmiejszenie przewodności. Z tego względu szczelina międzyelektrodowa, przez którą przepływa elektrolit polimerowy, musi mieć mały wymiar. To z kolei zwiększa opory przepływu polimerowego elektrolitu, który ma konsystencję półpłynnej pasty. Istotną rolę odgrywają również właściwości reologiczne takich past ze względów użytkowych. W przeprowadzonych badaniach wygładzania powierzchni płaskich i zaokrąglania ostrych krawędzi wykorzystano polimerowe elektrolity w postaci polimerowych żeli oraz hydrożeli na bazie akryloamidu.

In-situ study of the influence of crystallization on the ionic conductivity of polymer electrolytes

51%

Marzantowicz M. , Dygas J. R. , Krok F. , Zygadło-Monikowska E. , Florjańczyk Z.

Materials Science Poland

2006

tom Vol. 24, No. 1

195--203

Simultaneous impedance measurements and optical observations of polymer electrolytes were conducted in an automated experimental setup, combining an impedance analyser, polarizing microscope with a heating stage and a digital camera. The polymer film was placed between glasses with indium tin oxide conductive layers, forming a transparent cell mounted in a custom-designed holder, which preserved an argon atmosphere. Results of in-situ studies for various compositions of poly(ethylene oxide) (PEO) with LiN(CF3SO2)2 salt (LiTFSI), as well as pure PEO, are presented. In the investigated systems, crystallization had a strong impact on ionic conductivity. It was found that the initial growth of crystalline structures caused only a small fraction of the total decrease of conductivity. A large decrease in conductivity was observed during the second stage of crystallization, when no significant changes in microscope picture were observed. In pure PEO and the PEO:LiTFSI 6:1 system, a dense crystalline structure developed, resulting in a decrease in conductivity of over two orders of magnitude. In dilute PEO:LiTFSI systems, a "loose" structure was formed, with amorphous areas preserved between crystallites, and conductivity decreased by only a factor of about 6.