Formation of disordered and partially ordered LixCo1−xO

Abstract

Analysis of XRD, TG, XANES and density measurement data show that a new, partially-ordered, rock salt-like phase, W, exists for Li_xCo_1−xO, 0.075 ≤ x ≤ 0.24(2)–0.31(2), depending on temperature, with doping mechanism: 2Co²⁺ ↔ Li⁺ + Co³⁺. Phase W forms as ordered domains within a cation-disordered rock salt solid solution based on CoO; domain size depends on temperature and composition. Binary phase diagrams of Li_xCo_1−xO and phase W solid solutions in air and N₂ are presented.