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Ion solvation in lithium battery electrolyte solutions. 1. Apparent molar volumes (1991)

Atkins, P. ; Hefter, G. T. ; Singh, P.

Springer

Journal of solution chemistry 20 (1991), S. 1059-1078

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ISSN: 1572-8927

Keywords: Apparent molar volumes ; electrolytes ; lithium batteries ; propylene carbonate ; acetonitrile ; dimethoxyethane ; tetrahydrofuran ; mixed solvents

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract Apparent molar volumes, Vϕ(MX), of seven electrolytes (NaClO4, NaCF3SO3, NaBPh4, LiClO4, LiAsF6, Ph4AsCF3SO3 and KCF3SO3) have been determined by vibrating-tube densimetry in nonaqueous solvent mixtures of propylene carbonate (PC) with acetonitrile (AN), dimethoxyethane (DME) and tetrahydrofuran (THF). Vϕ(MX) was measured at an electrolyte concentration of 0.05M over the entire solvent composition range wherever possible. Ionic apparent molar volumes of transfer, ΔtVφ(ion), were obtained via the tetraphenylarsonium tetraphenylborate (TATB) assumption. ΔtVφ(ion) from PC to the mixed solvents are generally strongly negative for both cations and anions consistent with the greater compressibilities and lower dielectric constants of the cosolvents. In PC/AN mixtures cations and anions have similar values of ΔtVφ(ion) but in PC/DME and PC/THF mixtures they differ considerably. Cationic volumes show the expected dependence on ion-size but the differences among the anion volumes are much greater than expected at high cosolvent compositions. These effects are discussed in terms of preferential solvation and other solvent interactions. The implications of these findings for lithium batteries are briefly discussed.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00649097

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TSDC studies on thermoelectrets of CR-39(DOP) (1990)

Singh, A. ; Singh, P. ; Singh, V. P. ; [et al.]

Weinheim : Wiley-Blackwell

Acta Polymerica 41 (1990), S. 48-51

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ISSN: 0323-7648

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Description / Table of Contents: Aus dem Polymer CR-39(DOP) wurden Thermoelektrete formiert, und die thermisch stimulierten Entladungsströme wurden gemessen. Die Einflüsse unterschiedlicher Formierungstemperaturen, unterschiedlicher Feldstärken und der Lagerzeit wurden untersucht, um das Elektretverhalten dieses Materials zu beschreiben. Die Polarisation ist dipolaren Ursprungs. Die Aktivierungsenergic und die Relaxationszeit wurden berechnet.

Notes: Thermoelectrets of CR-39(DOP) were formed and their thermally stimulated discharge current studied. In the present work, effects of different forming temperatures, polarizing fields and storage times have been studies with a view to understand the electret behaviour of this material. The polarization seems to have a dipolar origin. The activation energy and relaxation times have also been calculated.

Additional Material: 4 Ill.