Solid-Solution Oxides for Storage-Battery Electrodes

Abstract

Insertion compounds contain a mobile cation of variable concentration over a wide range of solid solution. Charge compensation is achieved by a variation of mobile-electron concentration in the host matrix. Such mixed ionic/electronic conductors are of practical interest as electrodes in secondary batteries and electrochromic displays. Oxides containing transition-metal ions in unusually high valence states can be prepared by room-temperature extraction of mobile cations from such structures. Some properties of the systems Li 1- y CoO 2 and Na 1- y CoO 2 are presented.