摘要
Lithium nickelate(LiNiO_(2))was synthesized using the lithium excess method,and then characterized by X-ray diffraction,scanning electron microscopy and N_(2) adsorption-desorption.Finally,differential thermal and thermogravimetric analyses were performed in CO_(2)presence,at high temperatures.Results show that LiNiO_(2)is able to react with CO_(2)through a complex structural evolution process,where lithium atoms are released to produce Li_(2)CO_(3),while some nickel atoms are rearranged on different Li_(1-x)Ni_(1+x)O_(2)crystalline phases.LiNiO_(2)-CO_(2)reaction kinetic parameters were determined assuming a first-order reaction,where kinetic constants tended to increase as a function of temperature.However,kinetic constant values did not follow a linear trend.This atypical behavior was attributed to LiNiO_(2)sintering and crystalline evolution performed as a function of temperature.
基金
This work was financially supported by the project PAPIITUNAM(IN-101916).
