A Theoretical and Experimental Study of the Mass Transport in Gel Electrolytes: II. Experimental Characterization of LiPF6-EC-PC-P(VdF-HFP)
2011 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, Vol. 158, no 6, A636-A643 p.Article in journal (Refereed) Published
The mass transport in a gel consisting of LiPF6 dissolved in ethylene carbonate (EC), propylene carbonate (PC) and poly(vinylide-nefluoride-hexafluoropropylene) (P(VdF-HFP)) was characterized at 25 degrees C. Four diffusion coefficients, two transport numbers, one conductivity and two parameters describing the relationship between a concentration and a potential gradient were obtained in the characterization. The transport properties were obtained by optimizing a Maxwell-Stefan based transport model to data from four types of experiments. The transport model and the characterization method were analyzed in Part I. In order to give the results a comprehensible interpretation and to present a way of benchmarking electrolytes, we introduce the concept of a normalized potential gradient for gel electrolytes. The optimum composition range of the gel in terms of mass transport was found to lie between 5 and 7 wt % LiPF6 and as little polymer as possible without compromising the mechanical stability. It is suggested that measuring the normalized potential gradient can be used as a screening method when benchmarking electrolytes.
Place, publisher, year, edition, pages
2011. Vol. 158, no 6, A636-A643 p.
BATTERY ELECTROLYTES, POLARIZATION
IdentifiersURN: urn:nbn:se:kth:diva-29120DOI: 10.1149/1.3565023ISI: 000289854700003ScopusID: 2-s2.0-79955547805OAI: oai:DiVA.org:kth-29120DiVA: diva2:392020
FunderSwedish Research CouncilStandUp
QC 201507162011-01-252011-01-252015-07-16Bibliographically approved