Abstract
Thermodynamics and kinetics of the electrochemical insertion of lithium into cubic sodium tungsten bronzes and two different vanadium bronze structures have been studied. The cubic lithium sodium tungsten bronzes, Li yNa xWO 3, exhibit simple thermodynamic behavior, characteristic of a wide single phase solid solution region. The vanadium bronzes show more complex behavior, probably determined by the availability of several different kinds of crystallographic sites in these tunnel and layer structures. The solid state diffusion kinetics of all these materials are very rapid. Interfacial kinetics of the insertion of lithium from organic solvent based electrolytes have been studied using ac impedance spectroscopy, and exchange current densities obtained.
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