Abstract: Nanophase LiCoO₂was synthesized by solid-state reaction with low heating temperature, i.e. the reactants Co(Ac)₂·4H₂O and LiOH·H₂O in the appropriate molar ratio(1:1) were mixed and ground in agate mortar, then calcined. The samples obtained were characterized by XRD and IR methods. The phenomena during synthesizing are discussed by TG/TDA analysis, and the optimum temperature of heating was chosen. The BET and ICP results suggest that the sample has a large specific surface(54.29m²/g), a low quantity of impurity, thus it may be a good battery material. The nanophase-LiCoO₂samples produced have good cyclic performance and a higher working voltage plateau(3.9 V).

Key words: Nanophase particle, Solid-state reaction with low heating temperature, LiCoO₂