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Characterisation and modelling of the transport properties in lithium battery gel electrolytes - Part I. The binary electrolyte PC/LiClO4
KTH, Superseded Departments, Chemical Engineering and Technology.
KTH, Superseded Departments, Chemical Engineering and Technology.ORCID iD: 0000-0001-9203-9313
2004 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 0019-4686, Vol. 49, no 21, 3497-3505 p.Article in journal (Refereed) Published
Abstract [en]

A recent development trend for rechargeable lithium batteries is the use of ternary gel electrolytes. The main advantage of the gels is the mechanical rigidity, which improves as the polymer content is increased. However, the transport properties deteriorate with increasing polymer amount. This dualistic optimisation problem has caused an increased interest in understanding the transport processes in gels, however no full characterisation or modelling study could be found in the literature. In this paper, which is the first part of a study of the transport in the ternary gel system PMMA/PC/LiClO4, the liquid electrolyte PC/LiClO4 is characterised and modelled for concentrations between 0.1 and 2 M according to a previously employed methodology, based on electrochemical measurements. A model using concentration dependent interaction parameters proved to describe the results in the whole concentration region well. The cationic transport number and salt diffusivity were determined to be approximately 0.3 and 1e-10m(2)/s, respectively. The mean ionic activity factor variations prove to be substantial. Furthermore, it was demonstrated that the inter-ionic friction was important to consider at concentrations above 1 M. The fundamental friction parameters determined in this part will be used in the following part of the study to describe the friction between ions and solvent.

Place, publisher, year, edition, pages
2004. Vol. 49, no 21, 3497-3505 p.
Keyword [en]
lithium battery, liquid electrolyte, gel electrolyte, transport properties, modelling, characterisation, fast-ion transport, polymer electrolytes, diffusion-coefficients, propylene carbonate, transference number, conductance, dynamics, cells, coordination, viscosity
URN: urn:nbn:se:kth:diva-23534DOI: 10.1016/j.electacta.2004.03.020ISI: 000222253700006ScopusID: 2-s2.0-2942615373OAI: diva2:342232
QC 20100525 QC 20110923Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-23Bibliographically approved

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Georen, PeterLindbergh, Göran
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