Ionic systems – relating conductivity to structure

Liquid based lithium (Li) batteries dominate the current market. However, concerns about safety hazards as well as limited temperature range of operation and electrode corrosion has fostered research in all-solid-state recharchable Li batteries. Solid state batteries offer unique opportunities for greatly increased cycle life, safety and energy density. Polymeric electrolyte materials have been investigated for the past 25 years as promising materials for electrochemical device applications including high energy density rechargeable batteries, fuel cells, supercapacitors, electrochromic displays, etc. A reliable device, requires polymer electrolytes that combine high ionic conductivity at ambient temperature (σ>10-4 S/cm), high ionic transference number (preferably cationic), mechanical stability, chemical, thermal and electrochemical stability and compatibility with the electrode materials. Although major research has been conducted on SPEs, the phenomenon of ion transport is not completely understood mainly because charge transport is intimately connected to a number of structural features encountered in these systems [2].

Collaborators: S. Pispas (HRF, Athens), K. Müllen (MPI-P), H.-J. Butt (MPI-P)

Recent publications (2011-2016)

[1] K. Mpoukouvalas, D. Türp, M. Wagner, K. Müllen, H.-J. Butt, G. Floudas

“Dissociation and charge transport in salts of dendronized ions in solvents of low polarity”, 

J. Phys. Chem. B 115, 5801, 2011.

[2] G. Zardalidis, E. Ioannou, S. Pispas, G. Floudas

 “Relating Structure, Viscoelasticity and local Mobility to Conductivity in PEO/LiTf Electrolytes”, 

Macromolecules 46, 2705-2714, 2013.

[3] R. Moritz, G. Zardalidis, H.-J. Butt,M. Wagner, K. Müllen and G. Floudas

“Ion Size Approaching the Bjerrum Length in Solvents of Low Polarity by Dendritic Encapsulation”

Macromolecules 47, 191, 2014.

[4] K. Wunderlich, C. Grigoriadis, G. Zardalidis, M. Klapper, R. Graf, H.-J. Butt, K. Müllen, G.  Floudas

"Poly(ethylene glycol)-functionalized Hexaphenylbenzenes as Unique Amphiphiles: Supramolecular Organization and Ion Conductivity"

Macromolecules  47, 5691–5702, 2014.

[5] G. Zardalidis, E.F. Ioannou, K.D. Gatsouli, S. Pispas, E.I. Kamitsos, and G. Floudas

“Ionic Conductivity and Self-assembly in Poly(isoprene-b-ethylene oxide) Electrolytes doped with LiTf and EMITf”

Macromolecules 48, 1473-1482, 2015.

[6] G. Zardalidis, K. Gatsouli, S. Pispas, M. Mezger, and G. Floudas

Ionic Conductivity, Self-Assembly, and Viscoelasticity in Poly(styrene-b-ethylene oxide) Electrolytes Doped with LiTf

Macromolecules, 48, 7164–7171, 2015.

[7] G. Zardalidis, A. Pipertzis, G. Mountrichas, S. Pispas, M. Mezger, G. Floudas

“Effect of Polymer Architecture on the Ionic Conductivity. Densely Grafted Poly(ethylene oxide) Brushes Doped with LiTf”

Macromolecules  2016.