E. Traversa

PEO based polymer electrolyte lithium-ion battery

Abstract Nanocomposite ZrO 2 -added PEO-based solid polymer electrolytes and nanocomposite Ag-added LiFePO 4 cathodes have been utilized to realize all solid state metallic lithium batteries. In this work the electrochemical properties of these materials will be illustrated and discussed.

A Theoretical Framework for Prediction of Solid State Potentiometric Gas Sensor Behavior.

A 3 electrode, Luggins Probe configuration was employed in making D. C. polarization and open-circuit potential (OCP) measurements on Platinum and La2CuO4 electrodes in atmospheres containing O2, NO, NO2, CO and CO2 at 500{degree sign}C. Each electrode potential, referenced to an isolated embedded reference electrode, changed when exposed to the aforementioned gases and the differences summed to equal the sensor signals previously seen when both electrodes were exposed to the same environment. Both the La2CuO4 and Pt electrode potentials went down when exposed to reducing gases (NO and CO) and went up when exposed to oxidizing gases (O2 and NO2). The Pt responses (DOCP) were larger than those for La2CuO4 for all gases. La2CuO4|YSZ|Pt sensors responded positively to NO and CO, negatively to NO2 and negligibly to O2. The D.C. polarization behavior for the Pt and La2CuO4 electrodes were contrasted and related to their individual gas responses (DOCPs).

Bi2Ru2O7 Pyrochlore Electrodes for Bi2O3 Based Electrolyte for IT-SOFC Applications

Bismuth ruthenate pyrochlore (Bi2Ru2O7: BRO) was tested as a ncathode in several bismuth oxide-based electrolyte cells. Erbium noxide stabilized bismuth oxide (ESB) (Bi2O3)0.8 (Er2O3)0.2, nBi2V0.9Me0.1O5.35 (BIMEVOX10, Me = Co, Cu, Zn), and Bi2Ru2O7 n(BRO) were synthesized via solid state reaction. ESB and nBIMEVOX powders were pressed and sintered into dense pellets nwhile BRO was deposited and sintered as porous electrodes onto nESB and BIMEVOX dense pellet surfaces. Morphologies and nphases of the materials were characterized by Field Emission nScanning Electron Microscope and x-ray diffraction, respectively. nElectrochemical performances of BRO/ESB and BRO/BIMEVOX nsymmetric cells were tested using Electrochemical Impedance nSpectroscopy (EIS) at 200-700 °C in air. High polarization for nBIMEVOX cells was observed, while ESB cells showed a npromising behaviour. Different electrochemical performances of nBRO electrodes, with ESB or BIMEVOX, indicated that the nphases formed at electrodes/electrolyte interface controlled the cell npolarization process.