Study on the Lithium Oxide-Nickel Oxide System

Abstract

Thermodynamic activity measurements of dissolved lithium oxide in normalNiO‐Li2O solid solutions have been carried out within the homogeneity range to the solubility limit (about 33 a/o lithium). The measurements have been carried out by means of suitable galvanic cells, of the type normalPt/normalNiO‐Li2Ofalse(x2false)//normalintermediate electrolyte//normalNiO‐Li2Ofalse(x1false)/normalPt where α‐Li2SO4 and β‐spodumene have each been used as the intermediate electrolyte.

Ionic Conductivity in Solid Electrolytes Based on Lithium Aluminosilicate Glass and Glass‐Ceramic

“…The degree to which this change is associated with the conversion to the #-spodumene crystalline structure as compared to changes in other materials properties, e.g., glass phase and/or relative amounts of glass and crystalline phases, is not known. For the #-spodumene phase, results published by Pizzini and co-workers (22,23) on polycrystalline sintered pressed pellets show a larger activation energy (,~ 1.16 eV) than that reported here, but a <To of about the same value. Thus the conductivity of the sintered polycrystalline #-spodumene samples they examined is even lower than that of our #-spodumene glass-ceramic samples.…”

“…However, for solid electrolyte applications it is obviously important to enhance the ionic conductivity, and for this reason we have examined the ~-eucryptite materials. Some information on ionic conductivity is available on lithium aluminosilicates in the ~-spodumene phase (19,(22)(23)(24); however, there is very little information published on the ~-eucryptite materials (24), and none on the glass or glass-ceramic. Recent nuclear magnetic resonance (NMR) experiments (25) in conjunction with Raman scattering experiments (26) have shown that Li + motion does occur in LiA1SiO4 glass and glassceramic (~-eucryptite) materials.…”

Ionic Conductivity of Some Lithium Silicates and Aluminosilicates

“…Previously, an instrument for the measurement of carbon monoxide in ambient air was described (1,2). The operating principle of that analyzer was based on the electrochemical oxidation of carbon monoxide (3) at a platinum-catalyzed Teflon-bonded diffusion electrode (4) ; the potential of this sensing electrode being maintained constant at a value where neither oxygen reduction nor electrolyte decomposition interfered with the measurement of the pollutant.…”

“…The conductivities of a number of lithium containing electrolytes have recently been reviewed by Pizzini (1,2).…”

“…At the present time there is considerable interest in finding a lithium ion conducting solid electrolyte with properties appropriate for utilization in high energy density battery systems. The conductivities of a number of lithium containing electrolytes have recently been reviewed by Pizzini (1,2).…”