Ion Conductivity of Polymer Electrolytes Based on PEO Containing Li Salt and Additive Salt

2007 ◽  
Vol 119 ◽  
pp. 119-122 ◽  
Author(s):  
Seok Kim ◽  
Eun Ju Hwang ◽  
Soo Jin Park ◽  
Hyung Il Kim
Keyword(s):  
Ionic Conductivity ◽  
Polymer Electrolyte ◽  
Ethylene Carbonate ◽  
Lithium Ion ◽  
Close Correlation ◽  
Ion Conductivity ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Ionic Movement ◽  
Solid Type

Solid type polymer electrolyte is in progress of research and development in many ways to improve an ionic conductivity to attain 10-3 S/cm which is possibility of practical use of secondary lithium ion battery. There are two major methods of improving ionic conductivity; either lowering Tg of polymer or lowering the energy of ionic movement. In this work, the solid type polymer electrolyte (SPE) composites, which were composed of poly(ethylene oxide) (PEO), ethylene carbonate (EC) as a plasticizer, lithium salt, and 1-ethyl-3-methylimidazolium hexafluorophosphate (EMI-PF6) as a filler in order to improve the ion conductivity of the SPE, were prepared. The influence of EMI-PF6 contents on the ionic conductivity of the SPE composites was investigated in this work. As a result, the ionic conductivity of the SPE was enhanced by an increase in EMI-PF6 content, and showed the highest ionic conductivity at 40 wt.%. It was thought that there was a close correlation between the mobility of Li+ and EMI content in a SPE composite system.

Influence of Clay Addition on Ion Conductivity of Polymeric Electrolyte Composites

2006 ◽  
Vol 111 ◽  
pp. 155-158 ◽  
Author(s):  
Seok Kim ◽  
J.Y. Kang ◽  
Sung Goo Lee ◽  
Jae Rock Lee ◽  
Soo Jin Park
Keyword(s):  
Ionic Conductivity ◽  
Lithium Battery ◽  
Ethylene Carbonate ◽  
Lithium Ion ◽  
Polymeric Electrolyte ◽  
Sodium Cations ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Mmt Clay ◽  
Battery Application

In this work, the polymeric electrolyte composites (PECs) based on poly(ethylene oxide) (PEO), ethylene carbonate (EC) as a plasticizer, and lithium montmorillonite (Li-MMT) clay were fabricated, and investigated for understanding the effects of Li-MMT/EC in the polymer matrix on the ionic conductivity. For a lithium battery application, the native sodium cations in MMT were exchanged for lithium cations. As a result, the lithium ion was intercalated into the layer of the MMT clay, and thus PEO entered the galleries of MMT clay. The ionic conductivity was enhanced with increasing MMT contents due to the immobile MMT clay serving as the anion species and the decreased crystallinity of PEO.

CONDUCTIVITY AND DIELECTRIC STUDIES OF PURE AND DOPED POLY (ETHYLENE OXIDE) (PEO) SOLID POLYMER ELECTROLYTE FILMS

2015 ◽  
Vol 76 (3) ◽  
Author(s):  
Mohd Noor Zairi Mohd Sapri ◽  
Azizah Hanom Ahmad
Keyword(s):  
Ionic Conductivity ◽  
Ethylene Oxide ◽  
Polymer Electrolyte ◽  
Salt Concentration ◽  
Solid Polymer Electrolyte ◽  
Solid Polymer Electrolytes ◽  
Solid Polymer ◽  
Electrode Polarization ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The solid polymer electrolytes (SPEs) composed of Poly (ethylene oxide) (PEO) with sodium trifluoromethanesulfonate (NaCF3SO3) salt has been prepared by solution casting technique. The conductivity and dielectric of the solid polymer electrolyte systems were studied within the broad frequency range of 50 Hz–1 MHz and within a temperature range of 30 ˚C to 100 ˚C. The samples were prepared by various salt concentrations ranging from 2 wt% to 22 wt%. The sample containing 18 wt% of NaCF3SO3 salt exhibit the highest ionic conductivity of 1.091 x 10-5 Scm-1 at 30 ˚C. The conductivity of the SPEs has been found to depend on the salt concentration that was added to the sample. When higher salt concentration was added, ionic conductivity decreased due to the association of ions. The temperature of conductivity from 30 ˚C to 100 ˚C of SPEs was found to obey the Arrhenius rule. The dielectric permittivity decreased rapidly towards high frequencies due to the electrode polarization effects. 

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