Dynamic study on the decomposition of LiNiO2

The decomposition of LiNiO2 in the atmosphere was studied by DTA and XRD. The decomposition process was shown as following: LiNiO2(s)-->(Li2Ni8O10(s))-Li-650 similar to 720 degreesC+4Li(2)O((s))+O-2(g)-->(Li2O(s))-Li-850 similar to 950 degreesC+8NiO((s))+1/2O(2(g))-->(NiO(s))-Ni-1000 similar to 1150 degreesC+Li2O(g). The activation energies of the above three reaction stages were calculated by Doyle-Ozawa method and Kissinger method as 747.18+/-1.0 kJ.mol(-1), 932.46+/-1.0 kJ.mol(-1) and 1126.97+/-1.0 kJ.mol(-1). The reaction orders and frequency factors can be also determined by Kissinger method. The kinetics equations of each reaction were deduced as d alpha /dt=1.736x10(39)e(-135000/T)(1-alpha)(1.057), d alpha /dt=1.806x10(39)e(-111500/T)(1- alpha)(0.844) and d alpha /dt=4.262x10(42)e(-135000/T)(1-alpha)(1.275).