Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 158, Issue 6, Pages A636-A643Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3565023
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Funding
- Swedish Research Council
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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. (C) 2011 The Electrochemical Society. [DOI: 10.1149/1.3565023]
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