The effect of lithium doping on microstructure development and phase transi
tion of CoO was investigated. In the first stage of sintering lithium dopin
g increased the compact densification rate by Li2O evaporation. Then, with
increasing sintering process, grain growth being faster in lithiated sample
s than in pure cobalt oxide, LixCo1-xO sintered less rapidly than undoped c
obalt oxide. Lithium doping also stabilised CoO against transition from roc
k salt to spinel phase.