Development of a new plasticizer for poly(ethylene oxide)-based polymer electrolyte and the investigation of their ion-pair dissociation effect

Abstract

One approach to increasing the ionic conductivity of polymer electrolyte is to add plasticizers to the polymer-salt complexes 1. Recently, we have synthesized a new plasticizer, modified carbonate (MC3), by attaching three ethylene oxide units to the 4-position of ethylene carbonate 2. AC impedance studies 2 showed that an ionic conductivity of 5x10"5S em"I could be achieved at room temperature, by adding 50 wt% of MC3 into PEO-LiCFaSO 3 complex. This is two orders of magnitude higher than that found in PEO-I.iCF3SO3 electrolyte without a plasticizer, and one order of magnitude higher than that found when using same amount of propylene carbonate (PC) as plasticizer. Temperature dependent conductivity measurement and thermal analysis show that this new plasticizer increased the ionic conductivity throughout the entire complex system, while the conventional plasticizers only create a high conductivity path way through the plasticizer itself. The samples are free standing films with good mechanical properties. When MC3 is used as a plasticizer, the ionic conductivity increase is much higher than using PC as a plasticizer at high ' DISTRIBUTION OF THIS DOOUIVIENr 15 UNLIMITED 8 temperature (65 "C), implying an increase in the number of charge carriers. Therefore, we believe that MC3 has a stronger ion pair dissociation effect than PC, when used as a plasticizer. The ion pair dissociation effect was studied by Raman, FTIR, and near edge x-ray absorption fine structure (NEXAFS) spectroscopy.

Effect of plasticizer on electrical conductivity and cell parameters of (PVC+KBrO3) polymer electrolyte system

“…The effect of the addition of plasticizer to polymer electrolytes and its effect on conductivity have been investigated by several researchers [1][2][3][4][5].We have directed our attention to polyvinyl chloride (PVC) as a host polymer for the polymer electrolytes. PVC is a commercially available inexpensive polymer and is compatible with large varieties of plasticizer, such as ethylene carbonate, propylene carbonate, dibutyl phthalate, and dimethyl formamide (DMF).…”

Ionic conduction behavior in PVC–PEG blend polymer electrolytes upon the addition of TiO2

“…In order to enhance the performance of SPE in electrochemical utilities, several modifications are explored such as incorporation of nano-and inorganic fillers [1][2][3][4][5][6][7][8][9][10][11][12][13], and plasticizers [14][15][16], etc., in polymer electrolytes. The major issue in these modifications is focused on improving ion conductivity, which promises simultaneous mechanical properties and stable electrode/electrolyte interface.…”

Thermomechanical and Rheological Properties of High‐Molecular‐Weight Poly(ethylene oxide)/Novolac Blends

“…SMPs, with crystalline switching segments, offer fine tuning of the recovery temperature compared with an amorphous switching segment. [6,7] Poly(ethylene oxide) (PEO) is a semicrystalline polymer which has been considered in recent years for two important applications, namely solid polymer electrolytes [8][9][10] and as a crystallizable switching segment for SMP systems. [11][12][13] However, the basic problem with PEO-based SMPs is that these can not offer shape recovery below a temperature of 65 8C, which is too high for many applications.…”