Solid polymer electrolytes based on ethylene oxide polymers

Electrochimica Acta, 1995

Introduction of a few oxy-propylene oxide units in the poly (ethylene oxide) chains prevents their recrystallization while keeping the good solvating properties of poly (ethylene oxide) towards lithium ions. These materials have been synthesized by an original anionic copolymerization process on solid catalysts at the LCPP. NMR characterization will be presented. Solid polymer electrolytes have been prepared with lithium salts. Some of them have been obtained from these materials by changing the terminal OH groups into NH, groups and curing with diepoxides. Crosslinking improves the mechanical properties but does not degrade the electrochemical properties which compare favorably with those of similar solid polymer electrolytes prepared with pure poly (ethylene oxide) (PEO).

Journal of Power Sources, 1999

Studies of polymer electrolyte solutions for lithium-polymer batteries are described. Two different salts, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and lithium trifluoromethanesulfonate (LiTf), were dissolved in a variety of polymers. The structures were all based upon the ethylene oxide unit for lithium ion solvation and both linear and comb-branch polymer architectures have been examined. Conductivity, salt diffusion coefficient and transference number measurements demonstrate

Polymer blend electrolytes based on Polyethylene oxide (PEO) and polyvinyl pyrrolidone (PVP), complexed with NaIO 4 salt and Graphene oxide (GO) are investigated in the present report. The electrolytes are prepared by a facile solution cast technique. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) are employed to study the influence of ion-polymer interactions on the micro structural properties of blend electrolytes. Measurements of electrical conductivity of the blend polymer complexes have been performed by using complex impedance spectroscopy in the frequency range 1 Hz -1 MHz and within the temperature range 303 K -343 K.A study on electrical conductivity properties of GO doped 'salt complexed electrolyte' systems is presented.

Journal of Power Sources, 2003

Two kinds of composite, based on poly(ethylene oxide) (PEO) and a mineral saponite, were prepared and their thermal behavior, phase composition, microstructure and electrical properties were investigated. The results showed that PEO easily intercalates to the interlayer of saponite, replaces the interlayer water molecules, and acts as medium for lithium ions conduction. PEO-intercalated saponite exhibited conductivity as high as 4:1 Â 10 À3 S cm À1 , a lithium ion transference number of 0.99 at 25 8C and conductivity activation energy of 0.14 eV. Appropriate amounts of intercalated PEO in the interlayer of saponite is important to an ideal ionic conductivity. The PEO-intercalated saponite is thermally stable below 350 8C. In addition, a PEO-based composite with lithium saponite as filler showed a homogeneous morphology and combined properties of individual PEO and saponite. The PEO-intercalated saponite could be considered as a good candidate as filler for lithium conductive polymer electrolyte.

Polymer International, 2001

Sodium ion conducting thin ®lm polymer electrolytes based on poly(ethylene oxide) (PEO) complexed with NaClO 3 were prepared by a solution-casting method. Characterization by XRD, IR spectroscopy and AC conductivity has been carried out on these thin ®lm electrolytes to analyse their properties. The conductivity studies show that the conductivity value of PEO:NaClO 3 complex increases with the increase in salt concentrations. Increase in conductivity was found in the electrolyte system by the addition of low molecular weight polymer poly(ethylene glycol) (PEG) and the organic solvents dimethylformamide (DMF) and propylene carbonate (PC). Using these electrolyte systems, cell parameters were measured from the discharge study with the application of load 100 kV at room temperature with common cell con®guration NajelectrolytejC:I 2 :electrolyte. The open circuit voltage (OCV) ranges from 2.81 to 3.23 V and the short circuit current (SCC) ranges from 340 to 1180 mA.

Journal of Applied Electrochemistry, 1993

Results for the performance of lithium/MnO2 batteries containing solid polymer electrolytes based on poly(ethylene oxide) blends with some acrylic derivatives are presented. The ionic conductivities of the electrolytes are promising for battery application. It was found, however, that interfacial phenomena impair the battery efficiency. Impedance spectroscopy shows resistive limitations at the anode interface of the batteries, caused either by formation of an electrically distinguishable resistive layer or by chemical interaction between the polymer and lithium, influencing, most probably, the kinetics of the lithium oxidation reaction.

Chemistry of Materials, 2019

Polymer electrolytes constitute an attractive alternative to current liquid electrolytes used in Li-ion batteries. Unfortunately, the lithium-ion conductivities of the state-of-the-art polymer electrolytes are few orders of magnitude lower than those of liquid electrolytes at room temperature. In this work, we focus on poly(ethylene oxide) (PEO), which has shown the highest lithium ion conductivity in polymer electrolytes so far. At high salt concentrations, the lithium conductivity of a PEO electrolyte is strongly reduced because of the formation of ionic aggregates. Using molecular dynamics simulations and rigorously taking into account ionic correlations, we show how introducing a secondary site with a specific chemical structure in the backbone of PEO can greatly enhance the lithium conductivity of such concentrated electrolytes. In addition, we demonstrate how results based on the Nernst−Einstein equation can be highly misleading in the concentrated regime. We identify PEO-based carbonate and sulfonyl variants that, respectively, allow for significant ion dissociation and high cation transference number.

International Journal of Electrochemical Science, 2021

Solid state electrolyte system-based polyethylene oxide (PEO) been widely used as one of the promising polymer host that mainly used in advance material such as secondary battery. They have many benefits of PEO such as good electrochemical stability, excellent compatibility with inorganic salts, reasonable fabrication cost, good safety, and good energy density. However, due to the semicrystalline behaviour this electrolyte system poor mechanical strength and thermo-stability limit its application in solid polymer electrolyte (SPE). Worldwide research has been conducted to enhance the mechanical strength and electrochemical properties of the PEO electrolyte system such as blending, inorganic filler and plasticizer etc. Therefore, in this review the topic has been narrow down on issues of PEO polymer electrolytes system.

Polymer, 2002

A new polymeric solid electrolyte based on a PEO/PMVE-MAc blend, complexed with LiClO 4 , was obtained and characterized by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), polarized light optical microscopy, electrochemical impedance and cyclic voltammetry. DSC traces indicated miscibility for all the PSE samples. Crystallinity was suppressed for samples with LiClO 4 concentrations higher than 2.5 wt%. FTIR associated with DSC studies indicated that there is a preferential formation of complexes PEO/Li 1 /PMVE-MAc in all PSE samples studied here. The ionic conductivity of PSE reaches a maximum of about 10 25 S/cm at ambient temperature and 7.5 wt% LiClO 4. The electrochemical stability window is 4.5 V and associated with the other characteristics, make the PSE studied here suitable for applications in`smart-windows', batteries, sensors, etc.

Brazilian Journal of Physics, 2014

Solid polymer electrolytes have attracted considerable attention due to their wide variety of electrochemical device applications. In the present study, the fixed concentration of the salt lithium perchlorate (LiClO 4 ) and various concentrations of poly(ethylene oxide)/poly(vinyl pyrrolidone) (PEO/PVP)-based electrolytes were prepared by solvent casting technique. The structural analysis of the present system shows that the amorphous character of the samples is responsible for the process of ion transport. Fourier transform infrared spectroscopy (FTIR) has been used to characterize the structure of polymer and confirm the complexation between the polymers and salt. The maximum ionic conductivity value is found to be 0.2307×10 -5 S cm -1 for PEO (90 wt%)/PVP (10 wt%)/LiClO 4 (8 wt%) (A1) complex at 303 K (30 °C).