Abstract:A layered LiNiO₂ with high crystallinity was synthesized by sintering the finely prepared mixture of lithium hydroxide and nickel hydroxide in the oxygen atmosphere. The electro-chemical properties of LiNiO₂ show that it has a reversible capacity of more than 168mA·h·g^-1.It was found that with increasing temperature,LiNiO₂ decomposed in air followed with three reaction stages, the apparent activation energies were 747.18±1.0kJ·mol^-1,932.46±1.0kJ·mol^-1 and 1126.97 ±1.0kJ·mol^-1 respectively,and the kinetic equations of the three reaction stages were obtained.

Key words: lithiumion batteries;LiNiO₂;electrochemistry;decomposition;kinetics